初始进气充量成分对末端气体自燃化学特性的影响

本文介绍了在一台单缸二冲程爆震实验发动机上，研究进气充量中不同的残余气体成分对焰前反应及自燃的影响的实验结果。结果表明，初始进气充量中含有一定量的残余废气时，抑制了自燃；在残余废气中含有一定量的部分氧化产物时，促进了低温化学反应和自燃。低温化学反应所释放的热量以及活性中间产物的积累导致了终燃混合气的自燃。ＲＯＮ５３汽油的自燃过程表现为两阶段着火特征。

Effects of Initial Inlet Charge Compositions on the Autoignition Chemistry Behaviors of End Gas

This paper reports the results of an experimental study on the effects of inlet charge compositions on the preflame reaction and autoignition in a single cylinder two stroke spark ignition engine.The results demonstrate that when the inlet charge includes some recycled products of combustion,autoignition was inhibited.While charging with some partial oxidation products from the previous cycle without combustion,the low temperature chemical reaction and autoignition were enhanced.The low temperature chemistry provides enough heat release for increasing the end gas temperature to initiate autoignition.It was also found that the autoignition of RON53 gasoline exhibits the two stage characteristics of ignition process.