火花点火发动机燃烧循环变动的理论研究  

A Theoretical Study on Combustion Variations in Spark Ignition Engine

作　　者：沈惠贤[1] 刘亮[1] 蒋德明[1] 

机构地区：[1]西安交通大学

出　　处：《内燃机学报》1997年第4期441-450,共10页Transactions of Csice

基　　金：国家自然科学基金会攀登计划资助

摘　　要：本文改进了一个火花点火发动机的准维计算模型，并对燃烧的循环变动进行了理论计算研究。这个模型包括点火时刻火花塞附近气流平均速度、湍流强度、气缸内残余废气系数以及缸内总的混合气质量等的循环变动的影响。将计算结果和试验结果进行了比较，证实了用这个模型可以较精确地预测燃烧的循环变动。另外，运用这个模型分别讨论了湍流强度、火焰中心位置在缸内的移动，以及残余废气系数的循环变动对不同燃烧阶段循环变动的影响程度，从而得出了一些有益的结论。This paper modified a quasi dimensional model and utilized it to study theoretically the combustion variations in spark ignition engines. This model took into account effects of the variations in such influencing factors as the gas convection motion in the vicinity of the spark plug at the spark discharge moment, turbulence intensity, residual gas fraction, overall mass in the cylinder, etc. Computation results were compared with experimental findings and it is verified that this model can quite accurately predict the combustion variations. In addition, this model was used to discuss the extent to which the variations in turbulence intensity, flame center shift in the cylinder and residual gas fraction influence respectively the combustion variations at different burning stages. In this way, some useful conclusions were drawn.

关 键 词：火花点火发动机 燃烧 循环变动 

分 类 号：TK401[动力工程及工程热物理—动力机械及工程]