密封对柴油机冷却模块性能影响的试验研究

Experimental Study on Effect of Encapsulation of Cooling Module for Diesel Engine

针对某款载重车用柴油机冷却模块,将换热器间的密封条拆除,使空气自由流通,与原密封方案进行风洞试验对比。结果表明:在风速4～10m/s范围内,中冷器散热量降低0.75%～1.82%,水散热器传热性能提高0.41%～1.36%,模块总散热量提高0.16%～0.48%,阻力下降约10%。在实车上相同的风扇吸风条件下,系统的有效进风量将会增加,模块散热效率进一步提高。紧凑式冷却模块适当减少密封时,其换热量呈现出前排换热器有所减弱后排增强的特性,模块总换热量得到改善,可在匹配设计中灵活调整其密封性能以达到优化柴油机工作条件和节能的目的。

Taking a typical truck cooling module as an object, the encapsulation between heat exchangers was removed to allow the cooling air to flow freely. Then the module was tested in a wind tunnel and compared with the original scheme. Results show that when the cooling air speed is in range of 4-10 m/s, the heat dissipation of charge air cooler （CAC） reduces by 0.75%-1.82%, and the heat transfer performance of radiator rises by 0. 41%-1. 36%, the total heat transfer amount of cooling module rises by 0.16%~ 0.48%. Air flow resistance of the module decreases by approximately 10%, thus in actual vehicle test under the same operating conditions of drawing fan, effective cooling air flow of the system would increase, leading to a higher heat dissipation efficiency of the module. According to the flow and heat transfer characteristics, proper reduction of encapsulation for the compact cooling module in its matching design can improve engine heat load and fuel economy.