大气压力对柴油机冷却系统热平衡影响的研究  

A Research on the Effects of Atmospheric Pressure on the Thermal Balance of Cooling System in Diesel Engine

作　　者：许翔[1] 刘瑞林[1] 刘刚[1] 任晓江[2] 周平[2] 

机构地区：[1]军事交通学院汽车工程系,天津300161 [2]军事交通学院研究生大队,天津300161

出　　处：《汽车工程》2012年第7期592-595,共4页Automotive Engineering

摘　　要：针对内燃叉车柴油机在高原上的热平衡问题,建立了柴油机高海拔热平衡试验台和冷却系统仿真模型,对某型叉车柴油机冷却系统进行了热平衡试验和仿真计算,得到了不同海拔高度条件下柴油机燃烧放热量的分配比例和冷却液温度等信息。结果表明,随着海拔的升高,柴油机出口冷却水温度逐渐增大;当海拔高度接近4 000m,环境温度为30℃时冷却系统出现过热问题,通过增大风扇的流量或提高散热器的换热效率,降低了发动机的出水温度,缓解了柴油机冷却系统的高原过热问题。Aiming at the thermal balance problem of diesel engine in internal-combustion forklift at plateau, a thermal balance test bench and a simulation model for its cooling system at high altitude are set up. Both thermal balance test and simulation on the cooling system of an internal-combustion forklift are conducted, and the informa- tion on the distribution of released heat from combustion and the coolant temperature of diesel engine at different heights above sea level is obtained. The results show that the outlet coolant temperature of coolant rises with the in- crease of altitude ; when the altitude approaches 4000m with an ambient temperature of 30℃ the cooling system will overheats. By increasing the air flow of cooling fan or raising the heat transfer efficiency of radiator, the outlet cool- ant temperature of engine lowers and hence the overheat problem of cooling system of diesel engine at plateau is miti- gated.

关 键 词：内燃叉车 柴油机 冷却系统 大气压力 热平衡 

分 类 号：TK423[动力工程及工程热物理—动力机械及工程]