Abstract

ESPINOZA, Henry; PATINO, Luís; GONZALEZ, Yordy  and  IRVING, Lezama. A predictive model of natural gas mixture combustion in internal combustion engines. Ing. Investig. [online]. 2007, vol.27, n.2, pp.11-17. ISSN 0120-5609.

This study shows the development of a predictive natural gas mixture combustion model for conventional combustion (ignition) engines. The model was based on resolving two areas; one having unburned combustion mixture and another having combustion products. Energy and matter conservation equations were solved for each crankshaft turn angle for each area. Nonlinear differential equations for each phase’s energy (considering compression, combustion and expansion) were solved by applying the fourth-order Runge-Kutta method. The model also enabled studying different natural gas components’ composition and evaluating combustion in the presence of dry and humid air. Validation results are shown with experimental data, demonstrating the software’s precision and accuracy in the results so produced. The results showed cylinder pressure, unburned and burned mixture temperature, burned mass fraction and combustion reaction heat for the engine being modelled using a natural gas mixture.

Keywords : predictive model; combustion; natural gas; internal combustion engine.

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