发动机舱的冷却气流仿真与散热的改善*

doi:10.19562/j.chinasae.qcgc.2020.09.008

汽车工程 ›› 2020, Vol. 42 ›› Issue (9): 1197-1205.doi: 10.19562/j.chinasae.qcgc.2020.09.008

发动机舱的冷却气流仿真与散热的改善^*

李田田^1,2, 赵兰萍³, 王建新², 朱志军², 张俊⁴, 张浩²

1.中国空气动力研究与发展中心,空气动力学国家重点实验室,绵阳 621000;
2.上海地面交通工具风洞中心,上海 201804;
3.同济大学机械工程学院,上海 201804;
4.上汽大众有限公司TEGG部,上海 201804

出版日期:2020-09-25 发布日期:2020-10-19
通讯作者: 李田田,硕士研究生,E-mail:tiantian.li@sawtc.com
基金资助:
*空气动力学国家重点实验室开放课题(SKLA20180201)资助。

Cooling Airflow Simulation and Heat Dissipation Improvement of Engine Compartment

Li Tiantian^1,2, Zhao Lanping³, Wang Jianxin², Zhu Zhijun², Zhang Jun⁴, Zhang Hao²

1. China Aerodynamics Research and Development Center, State Key Laboratory of Aerodynamics, Mianyang 621000;
2. Shanghai Automobile Wind Tunnel Center, Shanghai 201804;
3. School of Mechanical Engineering, Tongji University, Shanghai 201804;
4. TEGG, SAIC Volkswagen Automotive Company Limited, Shanghai 201804

Online:2020-09-25 Published:2020-10-19

摘要/Abstract

摘要： 为降低冷却阻力,对原车机舱气流进行了数值仿真,基于仿真结果,从改变冷却气流方向、降低气流经过前端部件的能量损失和提高散热器性能3个角度提出了不同的方案,进行风洞试验验证,结果表明,加装前端隔板后散热器进气量增加15%,而冷却阻力降低5 counts。对于机舱内部散热问题,通过仿真与试验结合的方法,采取多种措施(如在方向机后加装挡板引导气流加强其局部流动,风扇后加装导风罩进行热气流疏导,发动机进气口加装导流装置,以提供额外的冷却气流),结果方向机变速器悬置的散热得到改善,而前端的冷却气流不受影响。

关键词: 机舱散热, 冷却阻力, 数值仿真, 散热器, 风洞试验

Abstract: In order to reduce cooling drag, a numerical simulation on the air flow of original engine compartment is conducted. Based on the results of simulation, different improvement schemes are proposed from three aspects: changing the flow direction of cooling air, reducing the energy loss of air flow passing through front-end components and enhancing radiator performance, on which wind tunnel tests are carried out for verification. The results show that after front-end plate separator is added the flow rate of intake air increases by 15%, and cooling drag lowers by 5 counts. As for the heat dissipation within engine compartment, by combining simulation and test, several measures are taken, such as adding baffle plate behind steering box to intensify the local air flow, adding flow guiding shroud behind fan for guiding hot airflow and adding flow guiding device at the intake port of engine to supply extra cooling air flow. As a result, the heat dissipation of steering box and transmission mounts are improved with the cooling air flow in front-end unaffected

Key words: heat dissipation of engine compartment, cooling drag, numerical simulation, radiator, wind tunnel test

李田田, 赵兰萍, 王建新, 朱志军, 张俊, 张浩. 发动机舱的冷却气流仿真与散热的改善^*[J]. 汽车工程, 2020, 42(9): 1197-1205.

Li Tiantian, Zhao Lanping, Wang Jianxin, Zhu Zhijun, Zhang Jun, Zhang Hao. Cooling Airflow Simulation and Heat Dissipation Improvement of Engine Compartment[J]. Automotive Engineering, 2020, 42(9): 1197-1205.

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发动机舱的冷却气流仿真与散热的改善^*

Cooling Airflow Simulation and Heat Dissipation Improvement of Engine Compartment

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