进气门关闭角度对内燃机换气过程的影响规律研究  

Influence of Intake Closing Timing on Gas Exchange Process in Internal Combustion Engine

作　　者：刘福水[1] 尚勇[1] 王丽[1] 陆滢[1] 

机构地区：[1]北京理工大学机械与车辆学院,北京100081

出　　处：《内燃机工程》2013年第6期52-57,共6页Chinese Internal Combustion Engine Engineering

基　　金：国家部委预研项目(40402020101);中国博士后科学基金资助项目(2013M530533)

摘　　要：采用一维仿真方法探讨了进气门晚关角在某较高转速外特性工况点对发动机性能的影响规律和作用机制。分析可知,进气门关闭时刻气门座处的流速为零并不会使充量系数达到最大,适当增大进气门晚关角可使得正向进气量增加,但过度增大进气门晚关角将使得进气倒流量显著增加,从而不利于提高综合进气量。针对原型机进行进气门晚关角的优化并进行了试验验证。在2 100r/min最高负荷工况下,优化后充量系数和总进气量均提高了约5.0%;按照等空燃比运行工况策略,发动机功率增加约2%。Effect of intake closing retard on diesel engine performance, its mechanism and rule were analyzed by 1D simulation at a higher speed on the Full Load Speed Characteristics. It is revealed from the simulation results that the max. volumetric efficiency cannot be achieved as intake air velocity is zero at the intake closing timing, and by increasing properly intake closing retard the intake air mass flow can be increased, but excessive retard will lead intake air converse flow and volumetric efficiency decrease. Intake closing retard of the objective diesel engine is optimized and verified experimentally. Under the conditions of engine 2 100 r/min and full load, volumetric efficiency and intake mass flow are improved about 5% and engine power improved about 2% operating on the constant air-fuel ratio condition strategy.

关 键 词：内燃机 进气门关闭角 作用机制 判断准则 

分 类 号：TK401[动力工程及工程热物理—动力机械及工程]