<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0120-100X</journal-id>
<journal-title><![CDATA[Revista ION]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. ion]]></abbrev-journal-title>
<issn>0120-100X</issn>
<publisher>
<publisher-name><![CDATA[Universidad Industrial de Santander]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-100X2013000100005</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Modelado de la combustión en motores Diésel: revisión del estado del arte]]></article-title>
<article-title xml:lang="en"><![CDATA[Modelling of combustion in Diesel engines: a review of the state of the art]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García Sánchez]]></surname>
<given-names><![CDATA[Gabriel Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chacón Velasco]]></surname>
<given-names><![CDATA[Jorge Luis]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chaves Guerrero]]></surname>
<given-names><![CDATA[Arlex]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Industrial de Santander CICT-Energías Grupo de Investigación en Energía y Medio Ambiente]]></institution>
<addr-line><![CDATA[Bucaramanga ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2013</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2013</year>
</pub-date>
<volume>26</volume>
<numero>1</numero>
<fpage>41</fpage>
<lpage>54</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-100X2013000100005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-100X2013000100005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-100X2013000100005&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[El estudio del proceso de combustión en motores Diésel ha sido, durante años, un tema de gran interés debido principalmente a la creciente necesidad de mejorar el rendimiento de los motores, reducir el consumo de combustible y reducir la emisión de contaminantes. Los estudios experimentales presentan la desventaja de requerir grandes recursos económicos y tiempo en su realización, razón por la cual se utilizan modelos computacionales que permiten estudiar el proceso de combustión de una forma más económica y práctica. En este artículo se presenta una revisión de varios de los modelos de combustión en motores Diésel más relevantes, desarrollados a nivel nacional e internacional, con el fin de dar al lector una visión de la evolución y el estado actual de este tipo de modelos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[The study of the combustion process in Diesel engines has been for years a subject of great interest mainly due to the increasing need to improve engine performance, reduce fuel consumption and reduce the pollutant emissions. Experimental studies have the disadvantage of require enormous efforts, money and time, that is the reason why computer models are used to study the combustion process in a more economical and practical way. This article presents a review of the most relevant Diesel engine combustion models developed nationally and internationally, to give the reader an insight of the evolution and current status of such models.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[modelado de la combustión]]></kwd>
<kwd lng="es"><![CDATA[motores diesel]]></kwd>
<kwd lng="es"><![CDATA[modelos termodinámicos]]></kwd>
<kwd lng="es"><![CDATA[modelos multidimensionales]]></kwd>
<kwd lng="en"><![CDATA[combustion modeling]]></kwd>
<kwd lng="en"><![CDATA[diesel engines]]></kwd>
<kwd lng="en"><![CDATA[thermodynamics models]]></kwd>
<kwd lng="en"><![CDATA[multidimensional models]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[   <font size="2" face="Verdana">   <font size="4">       <center><b>Modelado de la combusti&oacute;n en motores    <br> Di&eacute;sel: revisi&oacute;n del estado del arte</b></center></font> 		     <p align="center">Gabriel Fernando Garc&iacute;a S&aacute;nchez; Jorge Luis Chac&oacute;n Velasco<sup>*</sup>; Arlex Chaves Guerrero</p> 	     <p align="center">Grupo de Investigaci&oacute;n en Energ&iacute;a y Medio Ambiente - GIEMA, CICT-Energ&iacute;as,    <br> Universidad Industrial de Santander (UIS),    <br> Cra. 27 Calle 9, Bucaramanga, Colombia    <br> <sup>*</sup><a href="mailto:jchacon@uis.edu.co">jchacon@uis.edu.co</a></p>       <p align="right"><i>Fecha Recepci&oacute;n: 02 de noviembre de 2012    <br> Fecha Aceptaci&oacute;n: 07 de junio de 2013</i></p>   <hr>  <font size="3">    ]]></body>
<body><![CDATA[<p><b><left>Resumen</left></b></p></font>      <p align="justify">El estudio del proceso de combusti&oacute;n en motores Di&eacute;sel ha sido, durante a&ntilde;os, un tema de gran inter&eacute;s debido principalmente a la creciente necesidad de mejorar el rendimiento de los motores, reducir el consumo de combustible y reducir la emisi&oacute;n de contaminantes. Los estudios experimentales presentan la desventaja de requerir grandes recursos econ&oacute;micos y tiempo en su realizaci&oacute;n, raz&oacute;n por la cual se utilizan modelos computacionales que permiten estudiar el proceso de combusti&oacute;n de una forma m&aacute;s econ&oacute;mica y pr&aacute;ctica. En este art&iacute;culo se presenta una revisi&oacute;n de varios de los modelos de combusti&oacute;n en motores Di&eacute;sel m&aacute;s relevantes, desarrollados a nivel nacional e internacional, con el fin de dar al lector una visi&oacute;n de la evoluci&oacute;n y el estado actual de este tipo de modelos.</p> 	     <p align="justify"><i><b>Palabras clave:</b> modelado de la combusti&oacute;n, motores diesel, modelos termodin&aacute;micos, modelos multidimensionales.</i></p>  <font size="3">      <p><b>    <center>Modelling of combustion in Diesel engines:    <br> a review of the state of the art</center></b></p></font>  <font size="3">      <p><b><left>Abstract</left></b></p></font> 	     <p align="justify">The study of the combustion process in Diesel engines has been for years a subject of great interest mainly due to the increasing need to improve engine performance, reduce fuel consumption and reduce the pollutant emissions. Experimental studies have the disadvantage of require enormous efforts, money and time, that is the reason why computer models are used to study the combustion process in a more economical and practical way. This article presents a review of the most relevant Diesel engine combustion models developed nationally and internationally, to give the reader an insight of the evolution and current status of such models.</p>      <p align="justify"><i><b>Keywords:</b> combustion modeling, diesel engines, thermodynamics models, multidimensional models.</i></p>  <hr>  <font size="3">		     <p><b><left>Introducci&oacute;n</left></b></p></font>      ]]></body>
<body><![CDATA[<p align="justify">Los Motores de Combusti&oacute;n Interna (MCI), particularmente los motores Di&eacute;sel, son ampliamente utilizados como fuerza motriz en aplicaciones industriales como: transporte, agricultura y generaci&oacute;n de energ&iacute;a &#91;1&#93;, lo que los hace indispensables para la sociedad actual. Sin embargo, pese a que se han visto grandes avances en lo que respecta a la reducci&oacute;n de emisiones desde los a&ntilde;os 80 &#91;2&#93;, ellos siguen siendo los responsables de la mayor parte de la contaminaci&oacute;n en los principales centros urbanos, incrementando as&iacute; los problemas de salud de la poblaci&oacute;n y el efecto invernadero &#91;3&#93;; por esta raz&oacute;n actualmente hay grandes exigencias con respecto al desarrollo de motores Di&eacute;sel cada vez m&aacute;s eficientes y limpios, lo cual se ve reflejado en las legislaciones mundiales sobre el tema &#91;1,4&#93;. Con base en lo anterior, los estudios computacionales sobre desempe&ntilde;o de los motores Di&eacute;sel cobran gran importancia en nuestros d&iacute;as, ya que permiten realizar, mejoras significativas en el desempe&ntilde;o de los nuevos motores; tanto es as&iacute; que se puede afirmar que sin modelos de simulaci&oacute;n que cuantificaran los efectos de los procesos fundamentales en los sistemas del motor, los avances logrados en los motores actuales habr&iacute;an sido imposibles &#91;4,5&#93;.    <br> El proceso de combusti&oacute;n es el aspecto m&aacute;s importante de un motor de combusti&oacute;n interna &#91;6&#93;, por lo que su modelado es de gran relevancia al simular el comportamiento global de un motor Di&eacute;sel. Los modelos de la combusti&oacute;n se suelen clasificar de acuerdo a la representaci&oacute;n espacial del proceso, en este punto hay peque&ntilde;as diferencias en las categor&iacute;as de clasificaci&oacute;n utilizadas dependiendo del autor citado. De acuerdo a Heywood &#91;4&#93; hay dos grandes grupos en los cuales se pueden clasificar los modelos de combusti&oacute;n en motores Di&eacute;sel: los modelos flui-din&aacute;micos y los modelos termodin&aacute;micos, a su vez estos &uacute;ltimos se pueden clasificar como cero-dimensionales, fenomenol&oacute;gicos o cuasi-dimensionales. Fenollosa &#91;2&#93; propone una clasificaci&oacute;n de los m&eacute;todos de c&aacute;lculo para la descripci&oacute;n de la combusti&oacute;n en dos grupos principales: m&eacute;todos de descripci&oacute;n detallada y m&eacute;todos de descripci&oacute;n global. Bracco &#91;7&#93;, clasifica los m&eacute;todos en tres grupos: cero-dimensionales, cuasi-dimensionales o fenomenol&oacute;gicos y multidimensionales. Esta &uacute;ltima forma de clasificaci&oacute;n ser&aacute; la seguida por este art&iacute;culo, cabe destacar que las fronteras entre los diferentes tipos de modelos en ocasiones son un poco artificiales y algunos de ellos podr&iacute;an caber dentro de varias categor&iacute;as.    <br> En los &uacute;ltimos a&ntilde;os, debido al gran inter&eacute;s que ha despertado el uso de biocombustibles, han surgido varios modelos de combusti&oacute;n que buscan evaluar el desempe&ntilde;o de motores Di&eacute;sel alimentados con nuevos combustibles. Este es un tema de especial inter&eacute;s para la regi&oacute;n nororiental colombiana, la cual cuenta con una capacidad importante de producci&oacute;n de residuos de biomasa, como ha sido descrito por Escalante <i>et al</i>. &#91;8&#93;. Raz&oacute;n por la cual en este art&iacute;culo, adem&aacute;s de presentar la evoluci&oacute;n de los modelos de combusti&oacute;n Di&eacute;sel en el mundo, se har&aacute; &eacute;nfasis en los modelos de combusti&oacute;n recientes que buscan estudiar la factibilidad del uso de biocombustibles.    <br> Este art&iacute;culo iniciar&aacute; con la revisi&oacute;n de los modelos multidimensionales, cero-dimensionales y cuasi-dimensionales de la combusti&oacute;n, comenzando en cada caso con la presentaci&oacute;n de los trabajos desarrollados en el &aacute;mbito internacional y finalizando con los trabajos desarrollados en el &aacute;mbito nacional; y finalizar&aacute; presentando una comparaci&oacute;n de los modelos desarrollados recientemente con el fin de estudiar el desempe&ntilde;o de biocombustibles en motores Di&eacute;sel.</p>      <p align="justify"><b>Modelos multidimensionales</b>    <br> Los modelos multidimensionales o CFD (Computational fluid dynamics) son modelos que tienen el potencial de describir individualmente cada uno de los fen&oacute;menos f&iacute;sicos y qu&iacute;micos que tienen lugar dentro del proceso inyecci&oacute;n-combusti&oacute;n. Estos se basan en la resoluci&oacute;n num&eacute;rica de las ecuaciones diferenciales que gobiernan los procesos que ocurren dentro de la c&aacute;mara de combusti&oacute;n &#91;2&#93;.    <br> El desarrollo de este tipo de modelos se remonta a finales de los a&ntilde;os 70 &#91;9-11&#93;, ellos suelen utilizar dos marcos de referencia principales: la descripci&oacute;n euleriana continua &#91;12,13&#93; y la descripci&oacute;n lagrangiana discreta &#91;14-16&#93;; este &uacute;ltimo suele ser el m&aacute;s usado debido a que tiene ciertas ventajas desde el punto de vista de soluci&oacute;n num&eacute;rica &#91;2&#93;. A partir de la metodolog&iacute;a de c&aacute;lculo multidimensional han nacido varios c&oacute;digos CFD comerciales ampliamente utilizados, como SPEED&reg; &#91;17,18&#93;, FLUENT&reg; &#91;19&#93; y KIVA&reg; &#91;20,21&#93;, siendo este &uacute;ltimo el m&aacute;s usado a nivel mundial &#91;22&#93;; y recientemente, se ha desarrollado el software de c&oacute;digo abierto OpenFOAM &#91;23,24&#93;, el cual ha despertado gran inter&eacute;s en la comunidad cient&iacute;fica &#91;22&#93;. Recientemente los modelos multidimensionales han sido utilizados principalmente para estudiar los efectos de la inyecci&oacute;n y del flujo de combustible en el desempe&ntilde;o y generaci&oacute;n de emisiones del motor, como ejemplo de esto se pueden citar los trabajos de Zheng <i>et al</i>. &#91;25&#93; en 2005, quienes utilizaron un c&oacute;digo CFD para estudiar los efectos del &aacute;ngulo de inyecci&oacute;n, la temperatura inicial y la composici&oacute;n del combustible en el &aacute;ngulo de ingnici&oacute;n, la presi&oacute;n en c&aacute;mara y las emisiones de NOx; Jayashankara y Ganesan &#91;26&#93;, quienes en 2010 presentaron un modelo para el estudio de los efectos de la presi&oacute;n de entrada y el &aacute;ngulo de inyecci&oacute;n sobre el desempe&ntilde;o del motor y sus emisiones de NOx y material particulado; y Shi y Reitz &#91;27&#93; que en el mismo a&ntilde;o utilizaron un modelo para estudiar las estrategias de inyecci&oacute;n &oacute;ptimas en un motor de encendido por compresi&oacute;n, alimentado con Di&eacute;sel, gasolina y mezcla E10, y operando a condiciones de mediana y alta carga.    <br> En Colombia se han presentado varios estudios con modelos de este tipo en la Universidad de Antioquia. En 2008, Guti&eacute;rrez &#91;28&#93; estudi&oacute; la incidencia de la naturaleza del combustible y las condiciones locales de presi&oacute;n y temperatura en el proceso de inyecci&oacute;n Di&eacute;sel, as&iacute; como las variables que m&aacute;s afectan dicho proceso, por medio de un modelo num&eacute;rico CFD de la atomizaci&oacute;n y evaporaci&oacute;n del chorro Di&eacute;sel. En 2009, Agudelo y Agudelo &#91;29&#93; desarrollaron un modelo para simular los principales subprocesos que ocurren en un chorro Di&eacute;sel usando un c&oacute;digo CFD de libre acceso, dicho modelo se us&oacute; para evaluar el efecto del tipo de combustible, la presi&oacute;n de inyecci&oacute;n y la presi&oacute;n del gas ambiente en la penetraci&oacute;n de la punta del chorro, el di&aacute;metro medio de Sauter (SMD) y la masa de combustible evaporada. En 2010, Delgado &#91;30&#93; present&oacute; un estudio comparativo del proceso de combusti&oacute;n en t&eacute;rminos de los par&aacute;metros caracter&iacute;sticos que lo describen, utilizando para ello el c&oacute;digo CFD OpenFOAM.    <br> Este tipo de modelos presenta como ventaja su capacidad de describir cada uno de los fen&oacute;menos que tienen lugar en el proceso inyecci&oacute;n-combusti&oacute;n Di&eacute;sel, teniendo en cuenta tanto la geometr&iacute;a instant&aacute;nea del cilindro como la variaci&oacute;n espacial del campo de flujo. No obstante, tienen la desventaja de un mayor consumo de tiempo computacional en comparaci&oacute;n con los modelos termodin&aacute;micos &#91;22,31-33&#93; y su sensibilidad a los submodelos utilizados en los c&aacute;lculos, algunos de los cuales a&uacute;n no est&aacute;n bien definidos &#91;2,31&#93;.</p>      <p align="justify"><b>Modelos cero-dimensionales</b>    ]]></body>
<body><![CDATA[<br> Estos son modelos basados principalmente en la ley de conservaci&oacute;n de la energ&iacute;a, en los que se asume homogeneidad espacial de las variables implicadas en el proceso &#91;34&#93;.    <br> Muchos modelos cero-dimensionales se basan en la descripci&oacute;n matem&aacute;tica de la forma de la ley de liberaci&oacute;n de calor sin relaci&oacute;n directa con la f&iacute;sica que controla el proceso de inyecci&oacute;n-combusti&oacute;n &#91;2&#93;. El m&aacute;s conocido de estos m&eacute;todos es la funci&oacute;n de Wiebe &#91;35&#93; que se ha utilizado desde los a&ntilde;os 70 y se ha vuelto tan com&uacute;n que investigadores en varias partes del mundo han dejado de citar la fuente de la cual se origin&oacute; &#91;36&#93;. Dicha funci&oacute;n ha sido adaptada a lo largo de los a&ntilde;os para su uso en motores de diferentes caracter&iacute;sticas. En motores Di&eacute;sel de inyecci&oacute;n directa, en donde se presenta una fuerte liberaci&oacute;n de calor en la combusti&oacute;n premezclada, se descubri&oacute; que una sola ecuaci&oacute;n de Wiebe no era adecuada para modelar la liberaci&oacute;n de calor caracter&iacute;stica del proceso, por lo que se empez&oacute; a utilizar una combinaci&oacute;n de dos funciones de Wiebe (o funciones similares a ella), esto se puede apreciar en los trabajos de Dyechenko <i>et al</i>. &#91;37,38&#93;, Ghoel &#91;39,40&#93;, Watson <i>et al</i>. &#91;41&#93;, Miyamoto <i>et al</i>. &#91;42&#93; y Witt <i>et al</i>. &#91;43&#93;. En motores Di&eacute;sel modernos, en los que se han incorporado nuevas tecnolog&iacute;as y avanzados sistemas de combusti&oacute;n para disminuir las emisiones y el consumo de combustible, una o dos ecuaciones de Wiebe ya no resultan apropiadas para simular el calor liberado en la combusti&oacute;n, por lo que se han aplicado tres, cuatro o inclusive m&aacute;s como se puede observar en diferentes trabajos &#91;44-46&#93;. Una descripci&oacute;n detallada del proceso de desarrollo y las aplicaciones de las diferentes formas de la ecuaci&oacute;n de Wiebe se presenta en el trabajo de Ghojel &#91;36&#93;.</p>      <p align="justify">Otros modelos del tipo cero-dimensional describen el problema teniendo en cuenta la f&iacute;sico-qu&iacute;mica de los fen&oacute;menos ocurridos durante la combusti&oacute;n de forma simplificada, ellos en ocasiones tambi&eacute;n son clasificados dentro del grupo de los fenomenol&oacute;gicos &#91;2&#93;; entre los modelos de este &uacute;ltimo tipo se encuentran los trabajos realizados por: Way &#91;47&#93;, en el que se presentan dos m&eacute;todos para el c&aacute;lculo de la composici&oacute;n y propiedades termodin&aacute;micas del gas dentro de la c&aacute;mara durante la combusti&oacute;n; Hardenberg y Hase &#91;48&#93;, en el cual se obtuvo una ecuaci&oacute;n emp&iacute;rica para calcular el tiempo de retardo en la ignici&oacute;n, permitiendo evaluar los efectos del combustible, los par&aacute;metros del motor y las condiciones del motor sobre dicho tiempo de retardo; Gardner y Henein &#91;49&#93;, en el que se desarroll&oacute; un modelo matem&aacute;tico con el que se analizaron los efectos de la relaci&oacute;n de compresi&oacute;n en los par&aacute;metros de desempe&ntilde;o del motor; Harris y Pearce &#91;50&#93;, donde se realiz&oacute; un modelo que expresa el par, la potencia y el consumo de combustible como funci&oacute;n de la velocidad del motor a cero par y la disminuci&oacute;n de la velocidad del motor por debajo de la velocidad a cero par; y m&aacute;s recientemente el trabajo de Arr&egrave;gle <i>et al</i>. &#91;31&#93;, el cual identifica y cuantifica la influencia de los par&aacute;metros de inyecci&oacute;n y las condiciones de operaci&oacute;n en la combusti&oacute;n Di&eacute;sel, para esto se define un nuevo par&aacute;metro denominado Tiempo Aparente de Combusti&oacute;n (ACT, de sus siglas en ingl&eacute;s), que permite relacionar la ley de liberaci&oacute;n de calor con la ley de inyecci&oacute;n en el proceso de inyecci&oacute;n-combusti&oacute;n Di&eacute;sel; y el trabajo de Chmela <i>et al</i>. &#91;33&#93;, el cual presenta una estrategia gen&eacute;rica para el desarrollo de modelos de combusti&oacute;n cero-dimensionales usando las ecuaciones b&aacute;sicas para la tasa de reacci&oacute;n de Arrhenius y Magnussen.    <br> Recientemente, se han realizado varios modelos cero-dimensionales que buscan predecir el desempe&ntilde;o de motores Di&eacute;sel alimentados con diferentes tipos de biocombustibles. En 2006,Ramadhas <i>et al</i>. &#91;1&#93; desarrollaron un modelo que analiza las caracter&iacute;sticas de rendimiento de los motores Di&eacute;sel alimentados por biodi&eacute;sel de semilla de caucho y sus mezclas. En 2010, Gogoi y Baruah &#91;51&#93; desarrollaron un modelo que predice el desempe&ntilde;o de un motor Di&eacute;sel mono cil&iacute;ndrico de 4 tiempos alimentado con mezclas de biodi&eacute;sel de aceite de Karanja; Bueno <i>et al</i>. &#91;52&#93; obtuvieron un modelo por medio de un an&aacute;lisis exerg&eacute;tico con el fin de analizar el impacto que ocasiona el uso de &eacute;ster et&iacute;lico de aceite de soya en un motor Di&eacute;sel turbo-cargado, Cola&ccedil;o <i>et al</i>. &#91;53&#93; simularon el perfil de temperatura en un pist&oacute;n de un motor Di&eacute;sel bajo varias condiciones de carga, Cola&ccedil;o <i>et al</i>. &#91;3&#93; tambi&eacute;n presentaron un modelo que simula la presi&oacute;n en c&aacute;mara de un motor Di&eacute;sel operando bajo varias condiciones y usando diferentes mezclas de biodi&eacute;sel. En 2011, Payri <i>et al</i>. &#91;54&#93; presentaron un modelo para el estudio del desempe&ntilde;o del motor que cubre varias de las falencias que otros modelos presentan debido a las aproximaciones asumidas durante su desarrollo, como la consideraci&oacute;n de la c&aacute;mara de combusti&oacute;n como un sistema cerrado, la no consideraci&oacute;n de los cambios en la composici&oacute;n del gas al calcular los calores espec&iacute;ficos de &eacute;ste y la consideraci&oacute;n de una ley de liberaci&oacute;n de calor poco realista. Y en 2012, Patil y Akarte &#91;55&#93; estudiaron el desempe&ntilde;o de un motor Di&eacute;sel alimentado con metil ester de aceite de palma. En la <a href="#t01">Tabla 1</a> se presenta una descripci&oacute;n m&aacute;s detallada de estos &uacute;ltimos modelos.    <br> Estos modelos son relativamente sencillos teniendo como ventaja un bajo tiempo computacional frente a los modelos m&aacute;s complicados, como los CFD &#91;22,31,33,56&#93;, sin embargo presentan la desventaja de no poder describir en detalle los subprocesos que ocurren durante el proceso global de combusti&oacute;n Di&eacute;sel &#91;33&#93;.    <br> En Colombia se han desarrollado modelos cero-dimensionales en la Universidad de Antioquia y la Universidad Industrial de Santander. En la Universidad de Antioquia, en el a&ntilde;o 2000, Agudelo <i>et al</i>. &#91;57&#93; presentaron una metodolog&iacute;a para la simulaci&oacute;n del proceso de combusti&oacute;n en un motor de encendido por compresi&oacute;n de aspiraci&oacute;n natural o turboalimentado; m&aacute;s adelante en el 2008 Agudelo <i>et al</i>. &#91;58&#93; desarrollaron un modelo de diagn&oacute;stico exerg&eacute;tico de una zona y dos especies que se utiliza para caracterizar la operaci&oacute;n de un motor Di&eacute;sel. Por su parte en la Universidad Industrial de Santander se desarrollaron trabajos te&oacute;ricos por parte de Barbosa y Salcedo &#91;59&#93; y Rodr&iacute;guez &#91;60&#93;, quienes desarrollaron herramientas de simulaci&oacute;n de ciclo de un motor de cuatro tiempos con fines acad&eacute;micos, y Chac&oacute;n &#91;61&#93;, quien utiliz&oacute; el m&eacute;todo de Levenberg-Marquardt (LM) para ajustar los par&aacute;metros de la ecuaci&oacute;n de Wiebe.</p>      <p align="justify"><b>Modelos cuasi-dimensionales o fenomenol&oacute;-gicos</b>    <br> Los modelos cuasi-dimensionales son modelos que presentan un planteamiento cero-dimensional b&aacute;sico, pero incluyen alg&uacute;n aspecto geom&eacute;trico caracter&iacute;stico del proceso (como la geometr&iacute;a del chorro) o detalles espaciales adicionales para alguno de los fen&oacute;menos involucrados en la combusti&oacute;n (atomizaci&oacute;n, evaporaci&oacute;n, mezcla de combustibles, etc.) &#91;34&#93;. Ellos suelen dividir la c&aacute;mara de combusti&oacute;n en varias zonas, haciendo necesaria la resoluci&oacute;n de las ecuaciones de conservaci&oacute;n de masa y energ&iacute;a para cada una de &eacute;stas.    <br> Los modelos cuasi-dimensionales permiten calcular la formaci&oacute;n/destrucci&oacute;n de emisiones y tienen un bajo tiempo de c&aacute;lculo computacional frente a los modelos multidimensionales. Como inconveniente presentan la necesidad de ajustar algunos de sus coeficientes con resultados experimentales, debido al gran n&uacute;mero de simplificaciones que requieren &#91;34&#93;.    <br> Uno de los primeros trabajos bajo esta metodolog&iacute;a fue el realizado por Probert &#91;62&#93;, quien examin&oacute; la evaporaci&oacute;n del chorro de combustible usando una funci&oacute;n de distribuci&oacute;n de gotas; este trabajo fue posteriormente ampliado por Tanaswa &#91;63&#93;, quien relacion&oacute; expl&iacute;citamente los procesos de evaporaci&oacute;n y combusti&oacute;n por medio de un coeficiente de combusti&oacute;n. Otros de los trabajos pioneros de modelos fenomenol&oacute;gicos son los de Austen y Lyn &#91;64&#93; y Lyn &#91;65&#93; quienes plantearon un modelo que relaciona cuantitativamente la tasa de inyecci&oacute;n de combustible con la tasa de calor liberado; Cook &#91;66,67&#93; Nagao <i>et al</i>. &#91;68&#93; y Shipinsky <i>et al</i>. &#91;69,70&#93; que describieron el proceso de combusti&oacute;n de manera similar a Austen y Lyn pero dividiendo la tasa de inyecci&oacute;n en zonas que se pueden evaporar, autoencender y quemar de forma independiente.    ]]></body>
<body><![CDATA[<br> Estos primeros trabajos est&aacute;n basados en la hip&oacute;tesis de que la evaporaci&oacute;n es el fen&oacute;meno que controla la combusti&oacute;n, posteriormente aparecieron los trabajos de Whitehouse y Way &#91;71,72&#93;, en los cuales se desarroll&oacute; un m&eacute;todo para el c&aacute;lculo de la tasa de liberaci&oacute;n de calor que utiliza ecuaciones simples basadas en un modelo de una zona y que tiene en cuenta los efectos de la tasa de mezcla entre el aire y el combustible; Whitehouse y Sareen &#91;73&#93; en el que se present&oacute; un modelo de dos zonas basado en el trabajo de Whitehouse y Way; Grigg y Syed &#91;74&#93; en donde se consideraron los efectos, sobre la liberaci&oacute;n de calor, de la tasa de incorporaci&oacute;n del aire en el chorro de combustible, la tasa de mezclado turbulento de aire y combustible dentro del chorro, y la cin&eacute;tica qu&iacute;mica de la combusti&oacute;n; y Khan <i>et al</i>. &#91;75&#93; en el que se incluyeron los efectos de choque de la pared y swirl. Otros investigadores trabajaron en estrategias basadas en la teor&iacute;a de chorro estacionario de Abramovich &#91;76&#93;, como Adler y Lyn &#91;77&#93; quienes la adaptaron al estudio de chorros transitorios pero sin validarla para condiciones de motor. Posteriormente, Rife y Heywood &#91;78&#93; lograron adaptar el trabajo de Alder y Lyn a las condiciones de motor.    <br> Chiu <i>et al</i>. &#91;79&#93; usaron ecuaciones emp&iacute;ricas para describir la penetraci&oacute;n del chorro, su &aacute;ngulo de apertura y su trayectoria, con el fin de describir la naturaleza transitoria de los chorros Di&eacute;sel. Hiroyasu <i>et al</i>. &#91;80&#93; utilizan un enfoque similar al de Chiu y otros para describir el chorro Di&eacute;sel. Dent <i>et al</i>. &#91;81,82&#93; utilizan un tratamiento del chorro similar al de Hiroyasu y otros, que posteriormente es ampliado por el trabajo de Kyriakides <i>et al</i>. &#91;83&#93;. Simult&aacute;neamente a este &uacute;ltimo, Tinaut &#91;84&#93; trabaj&oacute; en un modelo multi-zona en el que la masa inyectada se divide en paquetes en los que se considera la atomizaci&oacute;n, evaporaci&oacute;n y englobamiento del aire. M&aacute;s adelante Lapuerta &#91;85&#93; y Desantes <i>et al</i>. &#91;86&#93; incluyen efectos de interacci&oacute;n del chorro con el v&oacute;rtice y c&aacute;lculos de la trayectoria de &eacute;ste al trabajo de Tinaut.    <br> A partir de los 90 la mayor&iacute;a de los modelos del tipo cuasi-dimensional han sido modelos multi-zona basados en el tratamiento mixto del chorro inyectado &#91;2&#93;. Ejemplos de esta aproximaci&oacute;n se pueden observar en los trabajos de Rakopoulos y Hountalas &#91;56&#93;, Bazari &#91;87&#93;, Cui <i>et al</i>. &#91;88&#93;, Kouremenos <i>et al</i>. &#91;89&#93;, Ottikkutti <i>et al</i>. &#91;90&#93;, Shenghua <i>et al</i>. &#91;91&#93;, Torkzadeh <i>et al</i>. &#91;92&#93; y Bi <i>et al</i>. &#91;93&#93;. Algunos de los modelos multi-zona desarrollados en los &uacute;ltimos a&ntilde;os son los de Rakopoulos <i>et al</i>. &#91;32&#93; en 2007, cuyo fin es el de estudiar el desempe&ntilde;o de un motor Di&eacute;sel de inyecci&oacute;n directa (ID) que usa aceite de semilla de algod&oacute;n y su Di&eacute;sel derivado como combustible; Rakopoulos <i>et al</i>. &#91;94&#93; en 2008, el cual es utilizado para examinar los mecanismos de formaci&oacute;n de las emisiones en la combusti&oacute;n al usar mezcla etanol-Di&eacute;sel; Komninos <i>et al</i>. &#91;95&#93; en 2010, el cual se desarroll&oacute; con el fin de investigar la emisi&oacute;n de hidrocarburos quemados y la formaci&oacute;n de CO en motores HCCI alimentados con etanol puro e iso-octano puro; y Komninos y Kosmadakis &#91;96&#93; en 2011, cuyo objetivo es estimar el flujo de calor por las paredes del cilindro de un motor HCCI.    <br> En los &uacute;ltimos a&ntilde;os tambi&eacute;n se han desarrollado varios modelos de dos zonas, la mayor&iacute;a de ellos con el fin de predecir el desempe&ntilde;o de motores Di&eacute;sel alimentados con biocombustibles. Uno de estos es el realizado por Ganapathy <i>et al</i>. &#91;97&#93; en el 2009, que permite estudiar el desempe&ntilde;o de un motor Di&eacute;sel mono-cil&iacute;ndrico de cuatro tiempos, de inyecci&oacute;n directa y enfriado por aire, alimentado con biodi&eacute;sel de <i>Jatropha</i>. El mismo a&ntilde;o Ganapathy <i>et al</i>. &#91;98&#93; utilizaron el enfoque de optimizaci&oacute;n de Taguchi en combinaci&oacute;n con un modelo de dos zonas para identificar la configuraci&oacute;n &oacute;ptima de par&aacute;metros de entrada que maximizan el rendimiento t&eacute;rmico de un motor Di&eacute;sel que usa biodi&eacute;sel <i>Jatropha</i>. En 2010, Rajendra <i>et al</i>. &#91;99&#93; desarrollaron un modelo de dos zonas con el objetivo de medir la efectividad de la combinaci&oacute;n de dos m&eacute;todos para mejorar el desempe&ntilde;o del motor y disminuir las emisiones: el uso de biodi&eacute;sel de <i>Jatropha</i> y el uso de materiales cer&aacute;micos para aislar la c&aacute;mara de combusti&oacute;n (motor LHR). Gao <i>et al</i>. &#91;22&#93; simularon la generaci&oacute;n de NOx y material particulado en la combusti&oacute;n Di&eacute;sel convencional, la combusti&oacute;n de alta diluci&oacute;n (HDC) y la combusti&oacute;n limpia de alta eficiencia (HECC) en un motor Mercedes Benz 1.7 L, usando un modelo de dos zonas. Por &uacute;ltimo, en 2011, Jagadish <i>et al</i>. &#91;100&#93;, desarrollaron un modelo que permite estudiar el desempe&ntilde;o de un motor mono-cil&iacute;ndrico al ser alimentado con varios tipos de biocombustibles. Una descripci&oacute;n m&aacute;s detallada de estos modelos es presentada en la <a href="#t01">Tabla 1</a>.    <br> En Colombia, en los &uacute;ltimos a&ntilde;os, se han desarrollado modelos de acuerdo a la metodolog&iacute;a cuasi-dimensional en la Universidad Nacional y la Universidad de Antioquia. En 2010, Ortiz &#91;101&#93; elabor&oacute; un modelo cuasi-dimensional con el fin de analizar los efectos que tiene la modificaci&oacute;n de la viscosidad del combustible sobre la liberaci&oacute;n de energ&iacute;a, y Rodr&iacute;guez &#91;102&#93; desarroll&oacute; un modelo de formaci&oacute;n de contaminantes de combusti&oacute;n para la mezcla B5 que permite determinar la incidencia de la estructura y composici&oacute;n del combustible en la generaci&oacute;n de material particulado (MP), este &uacute;ltimo se present&oacute; como una herramienta que permite obtener resultados preliminares sobre el desempe&ntilde;o de la mezcla antes de la implementaci&oacute;n en motores de combusti&oacute;n interna. Mientras que en 2011 Villegas &#91;103&#93; utiliz&oacute; un modelo de diagn&oacute;stico cuasi-dimensional para realizar un estudio te&oacute;rico-experimental acerca de la incidencia de las mezclas Di&eacute;sel-biodi&eacute;sel de aceite de palma en la formaci&oacute;n de los &oacute;xidos de nitr&oacute;geno y material particulado.</p>      <p align="justify"><b>Modelos recientes para el estudio de la factibi-lidad del uso de biocombustibles</b>    <br> En la <a href="#t01">Tabla 1</a> se presenta una descripci&oacute;n de varios de los principales modelos que han sido desarrollados en los &uacute;ltimos a&ntilde;os con el prop&oacute;sito de estudiar la factibilidad del uso de biocombustibles en motores Di&eacute;sel. En dicha tabla se presentan los objetivos y resultados de cada trabajo, permitiendo as&iacute; la comparaci&oacute;n de sus respectivos alcances.    <br> Como se puede apreciar, los modelos cero-dimensionales se han venido utilizando recientemente para comparar los par&aacute;metros de desempe&ntilde;o de motores Di&eacute;sel alimentados con biocombustibles, con los mismos par&aacute;metros cuando dichos motores son alimentados con Di&eacute;sel convencional, esto sin tener en cuenta las emisiones contaminantes. Por otra parte los modelos cuasi-dimensionales se han utilizado para el mismo fin, pero incluyendo en los an&aacute;lisis las emisiones de contaminantes, esto debido a su mayor poder predictivo a causa del uso de m&uacute;ltiples zonas para los an&aacute;lisis de la c&aacute;mara de combusti&oacute;n.    <br> Finalmente, los modelos multidimensionales se han utilizado en casos en los cuales se necesita comparar caracter&iacute;sticas espaciales espec&iacute;ficas de la inyecci&oacute;n y del flujo de combustible, lo cual no podr&iacute;a realizarse con modelos de otro tipo.</p>      <p align="center"><a name="t01"></a><img src="img/revistas/rion/v26n1/v26n1a05t1.jpg"></p>  <font size="3">		     ]]></body>
<body><![CDATA[<p><b><left>Conclusi&oacute;n</left></b></p></font>      <p align="justify">En conclusi&oacute;n, los modelos de combusti&oacute;n Di&eacute;sel se pueden clasificar en tres grandes grupos: modelos multidimensionales, modelos cuasi-dimensionales y modelos cero-dimensionales. Los primeros son los m&aacute;s adecuados cuando se busca tener una descripci&oacute;n detallada del proceso de combusti&oacute;n Di&eacute;sel, mientras los segundos y los terceros son id&oacute;neos cuando se desea obtener una descripci&oacute;n global de &eacute;ste.    <br> Los modelos multidimensionales han venido evolucionando desde los a&ntilde;os 70 hasta llegar a los actuales c&oacute;digos CFD comerciales, ellos tienen el potencial para describir en detalle los fen&oacute;menos ocurridos durante la combusti&oacute;n y tienen en cuenta la distribuci&oacute;n espacial del proceso, pero presentan la desventaja de ser sensibles a los sub-modelos utilizados, algunos de los cuales no est&aacute;n completamente definidos, adem&aacute;s de consumir mayor tiempo en la simulaci&oacute;n del proceso, lo cual los hace los menos eficientes desde el punto de vista computacional.    <br> Los modelos cero-dimensionales son los m&aacute;s sencillos, y por ende los m&aacute;s eficientes a la hora de calcular los par&aacute;metros de desempe&ntilde;o del motor, sin embargo no describen en detalle los subprocesos que ocurren durante el proceso global de combusti&oacute;n Di&eacute;sel y son incapaces de calcular las emisiones de contaminantes en el motor. Algunos de ellos se basan en la descripci&oacute;n matem&aacute;tica de la forma de la ley de liberaci&oacute;n de calor sin relaci&oacute;n directa con la f&iacute;sica que controla el proceso, mientras que otros describen y discretizan el problema teniendo en cuenta la f&iacute;sico-qu&iacute;mica de los fen&oacute;menos ocurridos durante la combusti&oacute;n de forma simplificada. En los &uacute;ltimos a&ntilde;os se han desarrollado varios modelos bajo este &uacute;ltimo enfoque con el fin de evaluar el desempe&ntilde;o de motores Di&eacute;sel alimentados por biocombustibles de una forma relativamente sencilla.    <br> Por su parte los modelos cuasi-dimensionales, que se presentan como un punto intermedio entre los dos tipos anteriores, permiten calcular los par&aacute;metros de desempe&ntilde;o del motor de un modo mucho m&aacute;s sencillo que con un modelo multidimensional y, a diferencia de los modelos cero-dimensionales, tiene el potencial para calcular las emisiones del motor. Sin embargo, presentan como inconveniente la necesidad de ajustar algunos de sus coeficientes con resultados experimentales en cada situaci&oacute;n, debido al gran n&uacute;mero de simplificaciones que requieren. &Uacute;ltimamente la mayor&iacute;a de modelos del tipo cuasi-dimensional han sido modelos multizona, aunque tambi&eacute;n se han presentado modelos de dos zonas con el objetivo de predecir el desempe&ntilde;o y emisiones de motores Di&eacute;sel alimentados con biocombustibles.    <br> En Colombia la mayor parte de los modelos de la combusti&oacute;n han sido modelos cero-dimensionales, muchos de ellos desarrollados en la universidad de Antioquia, aunque tambi&eacute;n se han elaborados trabajos desde el enfoque cuasi-dimensional y multidimensional.</p>  <font size="3">		     <p><b><left>Agradecimientos</left></b></p></font>      <p align="justify">Los autores expresan sus agradecimientos a las Vicerrector&iacute;a de Investigaci&oacute;n y Extensi&oacute;n de la Universidad Industrial de Santander por la financiaci&oacute;n del proyecto &quot;Producci&oacute;n de energ&iacute;a a partir de residuos provenientes de la transformaci&oacute;n de la biomasa&quot; (Proyecto No. 5451), del cual hace parte este trabajo.</p>  <font size="3">		     <p><b><left>Referencias</left></b></p></font>      <!-- ref --><p align="justify">&#91;1&#93; Ramadhas AS, Jayaraj S, Muraleedharan C. 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