客车发动机舱的热管理系统CFD分析  

CFD Analysis on Heat Management System for Coach Engine Cabin

作　　者：费洪庆[1] 田杰安[1] 雷舒蓉 陈永哲[1] 闫伟[1] 

机构地区：[1]山东大学能源与动力工程学院,山东济南250061

出　　处：《内燃机与动力装置》2014年第1期25-28,共4页Internal Combustion Engine & Powerplant

基　　金：山东省科技发展计划(2011GGX10404):汽车散热器优化设计平台研发

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。Using Fluent software, this paper designs to optimize thermal management system of a coach. The analysis shows that the vehicle at low speed has the reflux phenomenon in the engine cabin. Most of air heated by the air intercooler and the radiator is blown by the fan back to the side ventilation grille along the lower part of the cabin. In such matter, heat cannot be effectively dissipa- ted out of the engine cabin, especially when the vehicle is operating at the low speed under high torque. The calculation shows that air reflux happens because the air is driven by the fan but not because air is heated by the engine. After the structure is optimized, the reflux phenomenon gets better, meeting the design demands of the thermal management system.

关 键 词：热管理系统 发动机舱 FLUENT 回流 客车 

分 类 号：U270.3[机械工程—车辆工程]