The study on in-cylinder tumble motion and its effect on combustion in 4-valve SIengines has recently become an important research area. In this paper, the changes oftumble strength, turbulence intensity and combustio...The study on in-cylinder tumble motion and its effect on combustion in 4-valve SIengines has recently become an important research area. In this paper, the changes oftumble strength, turbulence intensity and combustion process for three different shapes andconfigurations of dual-inlet port were measured in a 4-valve single cylinger SI engine. Theresults show that the increase of tumble strength leads to the increase of turbulence intensityduring compression process and therefore the improvement in combustion process. Whenone of the two inlet ports closed up at lower engine speed, much higher turbulence intensityand much better combustion are achieved, especially the ability of lean burn is enhanced dueto the combination of stronger tumble and swirl motions in the cylinder.展开更多
文摘The study on in-cylinder tumble motion and its effect on combustion in 4-valve SIengines has recently become an important research area. In this paper, the changes oftumble strength, turbulence intensity and combustion process for three different shapes andconfigurations of dual-inlet port were measured in a 4-valve single cylinger SI engine. Theresults show that the increase of tumble strength leads to the increase of turbulence intensityduring compression process and therefore the improvement in combustion process. Whenone of the two inlet ports closed up at lower engine speed, much higher turbulence intensityand much better combustion are achieved, especially the ability of lean burn is enhanced dueto the combination of stronger tumble and swirl motions in the cylinder.
