A simulation study on the effects of chamber geometry on combustion and emission in a diesel engine

A numerical simulation model based on the KIVA code was carried out for a DI diesel engine in-cylinder process. Two candidate chambers were compared with the original chamber to study their effects on combustion and emission characteristics. The results show that low emission was achieved in the chamber C with maximal bowl diameter and bowl depth. Compared with the original chamber, Soot and NO_x of the chamber C decrease 9.09% and 4.41% respectively at the 2000rpm, 2bar BMEP operation point. And the reductions at the 4000rpm full load operation point were 32.09% and 6.51% respectively. It is found that chamber geometry can affect the fuel distribution and air movement , then affect combustion and emission characteristics.