Experimental and numerical investigation of the effects of combustion chamber reentrant level on combustion characteristics and thermal efficiency of stoichiometric operation natural gas engine with EGR

摘要

In order to accelerate the flame propagation and hence to improve the thermal efficiency in the stoichiometric operation natural gas engine with exhaust gas recirculation, reentrant modification on the Cylindrical combustion chamber has been conducted in this study. The diameter ratio between chamber throat and cylinder bore (hereafter referred to as diameter ratio) has been gradually reduced from 0.64 to 0.46. The effects of the chamber reentrant level on the engine combustion and thermal efficiency were systematically investigated through experiments. Then the mechanisms of these effects were further clarified through both one-dimensional and three-dimensional simulations.