The Combustion Numerical Simulation Study Of The In-Cylinder Fueled With Lower Heating Value Gas Based On The Chemical Reaction Kinetics

In recent years, the shortage of the global resource and the serious pollution to living environment becomes more and more serious, so the research on clean alternative fuels is becoming an important direction of engine techniques. Lower heating value (LHV) gas has been considered as an potential alternative gas fuel and has been paid more and more attention nowadays. It will provide theoretical basis for promoting the effective and clean combustion in engine fuelled with LHV gas and the study will also benefit a lot to academic research.This paper adopted CHEMKIN software to make a sensitivity of the methane detail mechanism GRI-Mech 3.0, found main reactions whose sensitivity coefficients are large and establish a reduced chemical mechanism.Based on the research of simulation software coupled detailed chemical kinetics model consisting of KIVA and CHEMKIN, this paper uses the reduced mechanism to establish new multi-dimensional combustion model combined with simple chemical kinetics model. Meanwhile the effect of mesh density and computation step on the calculation results of model is studied. Experimental results indicate that the model is suitable to describe the in-cylinder combustion process of LHV gas fuel engine. Based on the experimental validation, the influence of parameters (such as fuel composition, the excess air ratio, ignition timing, swirl ratio, etc.) upon engine combustion is studied. In this paper, the combustion process and the main species formation in-cylinder were studied and described.This paper is a part of project 50976012 supported by the National Natural Science Foundation of China.