中冷器对非道路柴油机性能影响的对比研究

随着非道路移动工程机械发动机机功率的不断增加,为满足柴油机的动力性和经济性指标,对增压空的气冷却提出了越来越高的设计要求。本文通过场地试验的方法对比研究了水冷中冷器与空冷中冷器对某款装载机柴油机工作特性的影响。试验结果表明,水冷中冷器相比于传统的风冷中冷器能更有效的降低柴油发动机的进气温度:水冷中冷器在铲装作业和高速跑工况下增压空气平均出温分别比空冷中冷器低27.6%和10.5%,柴油机扭矩提升为1.6%和6.3%,并且油耗降低了4.0%和2.5%。相对进气压力对柴油机经济性指标有一定影响,适当增加进气压力可以减少油耗。

Experiment on Water-cooled and Air-cooled Charge Air Coolers Influencing on the Dynamic Performance of Diesel Engine

With the increasing engine power,more and more stringent requirements are put forward on the design of the charge air cooler to improve the dynamic performance and economic index of the diesel engine.This paper compares and studies the influence of water-cooled intercooler and air-cooled intercooler on the working characteristics of a loader diesel engine through field tests.It found that the water-cooled charge air cooler can more effectively reduce the intake air temperature than the traditional air-cooled charge air cooler.And the air temperature has a great influence on the performance of turbocharged diesel engine power.Under loading and high-speed running conditions,the average charge air temperatures of the water-cooled charge air cooler are 27.6%and 10.5%lower than that of the air-cooled charge air cooler,respectively.The diesel engine torques are increased by 1.6%and 6.3%,and fuel consumptions are reduced by 4.0%and 2.5%.The relative air pressure also influences the fuel consumption of the diesel engine,and a suitable increment of the inlet pressure can reduce fuel consumption.