文档介绍：汽车工程
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2013 年第 35 卷第 12 期 Automotive Engineering 2013 Vol. 35 No. 12
2013214
基于流固耦合的某增压汽油机排气歧管热分析*
朱晴,袁兆成,马家义,李世玉,黄阔,袁懋荣
( 吉林大学,汽车仿真与控制国家重点实验室,长春 130025)
[摘要] 鉴于某增压汽油机排气歧管在热冲击试验中的开裂问题,采用流固耦合热分析方法,用计算流体力
学和有限元软件计算了排气歧管的温度场和热应力分布,计算结果与试验数据吻合较好,并证实了排气歧管的开裂
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系热应力过高所致。据此对排气歧管结构进行了若干方案的改进最终采用四二合一的构型经试验测试不再发
生开裂现象。说明流固耦合热分析是解决排气歧管开裂问题的有效途径。
关键词: 增压汽油机; 排气歧管; 流固耦合; 热应力
Thermal Analysis for the Exhaust Manifold of a Supercharged
Gasoline Engine Based on Fluid-solid Coupling
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Zhu Qing Yuan Zhaocheng Ma Jiayi Li Shiyu Huang Kuo & Yuan Maorong
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Jilin University State Key Laboratory of Automotive Simulation and Control Changchun 130025
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Abstract In view of the problem of cracks which appear on the exhaust manifold of a specific gasoline en-
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gine in thermal-shock test the temperature field and thermal stress distribution of manifold are calculated by using
CFD and FEA software with fluid-solid coupling thermal analysis technique. The results of calculation well agree
with test data and conclude that the cracks on exhaust manifold are caused by high thermal stress. Accordingly the
structure of manifold is modified with several schemes and finally a scheme with four-to-two-to-one configuration is
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adopted. The manifold with that configuration has obviously lower thermal stress and cracks no longer happen again
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