柴油机涡轮再冷增压系统设计与试验

摘要

针对柴油机进行了涡轮再冷增压系统参数计算，设计并加工了空气涡轮增压器．对空气涡轮增压器和再冷增压系统进行了试验，空气涡轮最高效率达到77．4％，随空气涡轮转速和中冷器出口温度升高，气流流经涡轮温降增大．建立了匹配涡轮再冷增压系统的柴油机模型并进行了外特性的循环模拟计算，结果表明，所设计的涡轮再冷增压系统在保持柴油机进气量不变的同时，能够有效地降低柴油机进气温度和氮氧化物排放．%A turbo-cool turbocharging system is developed for CA6DL2 diesel engine. Air turbocharger design and a prototype manufacturing are made based on the specified parameters. Experiments of air tur- bocharger and turbocharging system were also carried out. Maximum efficiency of the designed air turbine reaches 77.4%. Experimental results show that air temperature is reduced with increasing rotational speed of air turbine and intercooler outlet temperature. Matching of engine model and turbo-cool turbocharging system was made, and engine characteristic at full-load condition was calculated. Simulation results show that turbo-cool can reduce charge air temperature and NOx emission effectively under the condition of the same intake air flow.