Novel features of end-gas autoignition revealed by computational fluid dynamics

摘要: Autoignition of the end-gas in combustion chamber is believed to be a primary cause knock spark ignition engines. Fundamental studies autoignition hydrocarbon + air mixtures has been performed successfully rapid compression machines. There also considerable progress towards numerical modeling these phenomena, but applications machine have based only on spatially uniform well-mixed condition. The authors report this paper implementation fluid dynamics code conjunction with Shell generalized (or reduced) kinetic model, which represents exothermic oxidation alkane components gasoline, predict development chamber. simulations reported were matched performance apparatus use at Leeds. In system, occurred cylindrical chamber, flat, end faces piston crown and cylinder head. reactants compressed by piston, was then brought rest its stroke. geometric configuration fully axisymmetric. This permitted two-dimensional treatment spatial conditionsmore » plane representing displacement half radius. Reactive gas flows simulated 14 [times] 50 mesh start compression, reduced 10 cells as reached top-dead-center. resolution within vicinity wall enhanced nonequidistant grid structure.« less