【摘要】 以CA6DF3-24柴油机为研究对象,提出了3种能够实现内部EGR的结构设计方案,利用GT-POWER软件建立了上述结构的仿真模型,模拟研究了3种结构能够达到的EGR率、NOx排放和油耗率特性。根据模拟计算结果从上述方案中优选出在排气凸轮上增加一个小凸轮,使排气门二次开启的最优设计方案。最后通过发动机试验研究了内部EGR对柴油机动力性、经济性和排放性能的影响。试验结果表明:内部EGR可有效降低柴油机的NOx排放量,但对排气烟度产生不利影响。更多还原

【Abstract】 This paper presented three structure design schemes which could realize internal EGR for CA6DF3-24 diesel engine.The work built three models using GT-POWER software and analyzed the results of EGR rate,NO_x emission and BSFC.According to the calculation results,the optimum scheme is to append a little cam for the exhaust cam which can make the exhaust valve reopen.At last,the researches focused on the influence of internal EGR on the power,economy and emission of the engine through the engine test rig.The results show that the internal EGR can effectively decrease NO_xemission.On the contrary,it makes the penalty on the exhaust smoke.更多还原