A more detailed prediction of engine performance requires
calculation of the combustion development inside the
combustion chamber of the engine. This combustion in a
homogeneous charge, spark-ignition engine is a deflagration
process in which the fuel is burned as a flame front travels
through the combustion chamber. The process is initiated by a
spark and the speed of flame front depends on the fuel and
flow characteristics. Prediction of combustion development
requires the consideration of all relevant processes in the form
of a combustion model [21] (Fig. 4).
A quasi-dimensional two-zone model has been used to
analyze the effect on combustion quality aspects (mechanical
power, pollutant emissions, etc.) under different engine
operating conditions (fuel composition, ignition timing, etc.).