Applying ECFM Combustion Model to Spark Ignition Engine, Comparison with Experimental Data

In order to increase the efficiency of the engine and reduce emissions, right sizing plays a predominant role. Validation of turbulent combustion in engine environment using numerical tools is even more challenging. For better understanding of the thermodynamic and chemical behaviour of gas, a proper CFD models set-up should be used to represent turbulence, heat model, ignition, flame propagation and knock. This paper presents an application of ECFM (Extended Coherent Flame Model) as a combustion model coupled with ISSIM (Imposed Stretch Spark Ignition Model) to create the flame kernel due to spark. Two mechanisms named stretching and wrinkling affect the development of the flame front. Stretching is a result from turbulent velocity, and wrinkling is a result from turbulent length scale. The effect of the ECFM model constant addressing stretching and wrinkling, and the process to fix those parameters are briefed in this paper. The simulation results have showed a very good agreement with the combustion test results of RENAULT Engine in terms of pressure, heat release rate and combustion duration.