Abstract
Keywords:
Flame Propagation, CFD, SI Engine, Combustion, Squish
Abstract
Flame propagation in simple combustion chambers, Pentroof type and Bowl-in-piston type, are investigated by numerical method in order to study the effect of squish. The numerical model is based on solving conservation of mass, momentum and energy coupling with the RNG k-epsilon turbulence model and Weller Wrinkled-Flame combustion model. Predicted cylinder pressure histories agree well with the experimental result from previous study. Cylinder pressure in case of bowl-in-piston shape is higher than pentroof shape as the results of faster burning rate. The faster burning rate obtain from the squish induce flame-front to spread in higher rate. The higher area of squish volume of the bowl-in-piston produces better squish characteristics. Therefore the combustion characteristics is determined by characteristics of squish in the cylinder that is produced by different chamber geometry.