柴油机燃用不同替代燃料的燃烧与排放特性分析

摘要

在一台增压发动机上分别进行了燃用生物柴油和二甲醚的燃烧和排放试验研究。研究结果表明：增压发动机在高负荷下燃用生物柴油和二甲醚时，预混合燃烧不明显，出现扩散燃烧单峰的燃烧规律，生物柴油燃烧的单峰规律更明显。与生物柴油相比，二甲醚的缸内压力峰值、压力升高率幅值和放热率峰值均降低；NOx 排放大幅下降， HC排放和CO排放升高，碳烟排放和燃油消耗率降低。%An experimental investigation of combustion and emissions characteristics was conducted on a turbocharged CI engine fueled with biodiesel and dimethyl ether ( DME) .The results show that the combustion for biodiesel and DME at high load presents the diffusion combustion mode, without the obvious premixed combustion, especially biodiesel.Com-pared to biodiesel, peak in-cylinder pressure, peak heat release rate and amplitude of pressure rise rate for DME de-crease.NOx emissions of DME significantly decrease, HC emissions and CO emissions increase, smoke emissions and BSFC decrease.