Abstract
Enhancing TKE (Turbulent kinetic energy) in cylinder is beneficial to accelerate flame propagation, short combustion duration and improve the thermal efficiency. In order to improve the TKE of the engine under low load, the design of air charge bypass was introduced. Based on Converge, the flow in cylinder of different design schemes was analyzed, and the best scheme was selected for combustion analysis experiment. The results show that there is little effect of bypass inclination angle on the flow, and only swirl is changed by the position of bypass channel, however the increase of the diameter of the bypass channel can significantly improve the tumble, swirl and TKE in the cylinder. Compared to the engine without bypass channel, the thermal efficiency of the engine with bypass channel is increased by 16% under low load (BMEP=2bar and engine speed= 3000rpm).
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