中文摘要：

利用大气模拟系统，在81kPa和100kPa的大气环境下，试验研究废气再循环（EGR）对柴油、B15E5燃料动力性、经济性及排放特性的影响。研究结果表明：使用EGR后，柴油机动力性下降较明显，81kPa时转矩的下降幅度高于100kPa时，B15E5燃料在最大转矩转速时动力性下降幅度大，转矩峰值消失。EGR对柴油机的经济性影响不明显，B15E5燃料的经济性差于纯柴油；低负荷工况有EGR时，柴油机燃油消耗率在81kPa时增加，而在100kPa时下降。EGR使柴油机的Nq排放明显下降，随着负荷增大降幅增大。EGR使柴油机的碳烟和C0排放明显增加，B15E5燃料的碳烟和CO排放明显低于纯柴油；81kPa时碳烟和CO排放高于100kPa时。EGR使燃烧温度和压力下降；100kPa时燃烧始点比81kPa提前。

英文摘要：

Through an atmosphere simulation system, an experimental investigation on the effect of EGR on the power performance, fuel economy and emission characteristics of a diesel engine fueled with pure diesel fuel and B15E5 oxygenated fuel was conducted in 81 kPa and 100 kPa pressure environments. The test results show that the power of the diesel engine fueled with pure diesel declines obviously when using EGR and the torque in 81 kPa pressure environment drops more than that in 100 kPa pressure environment. The power performance of the engine fueled with B15E5 fuel drops seriously at the maximum torque speed, and the peak torque disappears when using EGR. The influence of EGR on fuel economy of the diesel engine fueled with pure diesel is not obvious and the fuel economy of the engine fueled with B15E5 is worse. The fuel consumption of the diesel engine fueled with pure diesel increases at 81 kPa and declines at 100 kPa at low loads with EGR. The NOx emission of the diesel engine fueled with pure diesel significantly declines by using EGR, and it falls greater with the increase of load. Soot and CO emissions of both fuels are significantly increased by using EGR. And the soot and CO emissions of the B15E5 fuel are significantly lower than those of the pure diesel. Soot and CO emissions of both fuels at 81 kPa are higher than those at 100 kPa. Temperature and pressure in cylinder decrease when using EGR and combustion starts earlier at 100 kPa than at 81 kPa.