Effects of lateral swirl combustion chamber geometries on the combustion and emission characteristics of DI diesel engines and a matching method for the combustion chamber geometry

The results show that the combustion performance of the LSCS is primarily affected by the geometries of the split-flow creation, in which θ (the deviation angle of flow-guide) plays a dominant role. When θ was in the range of 15-27°, the combustion chamber created favorable flow guidance for spray and promoted the fuel/air mixture formation. After the geometrical optimization of the LSCS, fuel consumption decreased by 2.8-4.1 g/(kW.h) and soot emission decreased by 69-75% under various engine speeds as compared with the double swirl combustion system (DSCS).