费洪庆 田杰安，雷舒蓉，陈永哲，闫伟 

 山东大学能源与动力工程学院

    摘要：本文利用Fluent软件对某款的客车热管理系统进行了设计优化，经过分析得出该车低速工况下发动机舱内出现回流现象。在风扇卷吸气流的过程中，被中冷器、水散热器加热的气流有较大一部分经发动机舱室下部回流至客车侧面通风格栅，这样不利于客车发动机舱内的散热，尤其是对客车在低速、大扭矩工况下的运行影响较大。通过计算验证产生的回流大部分不是因发动机加热气流引起的，而是由于风扇卷吸气流引起的。经过结构优化后，回流现象得到了很大的改善，满足了客车的热管理系统的设计需求。

    关键词：热管理系统；发动机舱；Fluent；回流；客车

    Abstract：Using Fluent software，the designing coach thermal management system are designed in this paper. The vehicle starts reflux phenomenon in the engine cabin under the condition of low speed. Coming through the air intercooler, radiator, there is a large part of hotter airflow return to the side cabin ventilation grille of the coach in the engine cabin under the suction of fan, which is not conducive to the heat dissipation of the engine cabin, especially in the low speed, high torque operating conditions. Through the calculation, we have a verification of that this phenomenon is almost not caused by engine heating the flow, but for the suction of fan. After the structure optimization, the reflux phenomenon has been greatly improved; meeting the demand of bus thermal management system.

    Key words: Heat Management System; Engine Cabin; Fluent; Reflux; Coach