后置客车发动机舱温度场试验  

Experiment on Temperature Field in Rear Engine Compartment

作　　者：沈凯[1] 徐向阳 王先勇 倪计民[1] 

机构地区：[1]同济大学汽车学院,上海201804 [2]一汽客车(无锡)有限公司,江苏无锡214177

出　　处：《同济大学学报（自然科学版）》2013年第5期779-783,共5页Journal of Tongji University:Natural Science

基　　金：中央高校基本科研业务费专项资金(1700219107);教育部高等学校博士学科点专项科研基金(2011007212002)

摘　　要：针对后置客车发动机冷却系统散热不良的情况,通过客车道路试验实测了后置发动机舱空间各点温度分布情况,并分析了温度场分布的原因.对比了在不同车速下百公里油耗和发动机舱温度场分布的关系,分析温度场分布随车速变化的规律.指出在保证冷却系统冷却能力的情况下,冷却空气流量与散热器散热量成正比.并利用场协同理论,分析发动机舱内流场和传热特性,指出发动机舱内布置要减少涡流并尽量使温度梯度与流动方向一致.The temperature field in the rear engine compartment was measured and its cause was analyzed with the bus road test for defective cooling system in the rear engine compartment. The relationship between temperature field and brake specific fuel consumption at different bus speeds is compared. The comparative study results explains why the temperature field changes with bus speeds and indicates that when the cooling capacity of the cooling system is large enough, the air mass flow of cooling air is in proportion to the heat release of the radiator. Flow field and heat transfer characteristics are analyzed in engine compartment according to the field synergy principle. A proposal is put forward to try out decreasing vortex and keeping the direction of flow and temperature gradient consistent in the arrangement of rear compartment.

关 键 词：后置发动机舱 温度场 场协同 

分 类 号：TK402[动力工程及工程热物理—动力机械及工程]