热机耦合作用下缸盖热状态影响因素研究

张俊红; 胡欢; 徐喆轩; 赵永欢; 王杰; 戴胡伟

doi:10.13433/j.cnki.1003-8728.2018.0303

热机耦合作用下缸盖热状态影响因素研究

doi: 10.13433/j.cnki.1003-8728.2018.0303

1.
天津大学内燃机燃烧学国家重点实验室, 天津 300072;
2.
天津大学仁爱学院机械工程系, 天津 301636

基金项目:

国家重点新产品计划项目（2016YFD0700701）资助

详细信息

作者简介:
张俊红(1962-),教授,博士,研究方向为动力机械疲劳可靠性与优化设计,zhangjh@tju.edu.cn

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出版历程
- 收稿日期: 2017-02-08
- 刊出日期: 2018-03-05

Research on Influence Factors of Cylinder Head Thermal State with Thermo-mechanical Coupling

1.
State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China;
2.
Department of Mechanical Engineering, Tianjin University Renai College, Tianjin 301636, China

摘要

摘要: 为研究发动机缸盖在热机耦合作用下的热状态，利用流固耦合方法对缸盖的温度、耦合应力、热疲劳进行分析。然后，基于最优拉丁超立方法以及椭球基（EBF）神经网络模型建立燃烧强度、冷却液流动参数、机械载荷及火力面最高温度、最大耦合应力、低周热疲劳可用因子的近似模型，进行其影响因素的研究。分析结果表明：在燃烧强度的变量中，缸内温度和缸内换热系数对缸盖最大耦合应力以及热疲劳可用因子影响最大；提高冷却液进口温度，虽然降低了缸盖热疲劳可用因子但也升高了火力面最高温度，增大冷却液进口流速虽然降低了火力面最高温度但也升高了缸盖热疲劳可用因子；缸内最大爆发力对缸盖热疲劳可用因子、螺栓预紧力对缸盖最大耦合应力影响效果显著。
- 缸盖 /
- 流固耦合 /
- 近似模型 /
- 热状态
Abstract: To study the engine cylinder head thermal state with the thermo-mechanical coupling, the temperature, the coupling stress and the cylinder head thermal fatigue were analyzed making use of fluid-structure interaction. Based on the Latin hypercube method, the elliptical basis functions neural network model was established to describe the relationship among the burning intensity, coolant flow parameters, mechanical load, the maximum coupling stress and the low-cyclic fatigue factor, and the main impact factors were studied. The results show that in the burning intensity the temperature and heat transfer coefficient of cylinder have a large impact on the maximum coupling stress and the low-cyclic fatigue factor. Improving the inlet temperature of coolant can decrease the low-cyclic fatigue factor, but increase the temperature of cylinder head. Improving the inlet flow of coolant can decrease the temperature of cylinder head, but increase the low-cyclic fatigue factor. The maximum explosive pressure has significant effect on the low-cyclic fatigue factor, and the stress pretension force has significant effect on the maximum coupling stress.
- cylinder head /
- fluid-structure interaction /
- approximate model /
- thermal state

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参考文献(15)

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