| 高强度柴油机活塞温度与应力场有限元分析及其结构改进 |
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| 引用本文： | 蔡翌辉,刘畅,郭豪杰,温艳,汪舟,谢乐春.高强度柴油机活塞温度与应力场有限元分析及其结构改进[J].内燃机工程,2020,41(1):1-11. |
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| 作者姓名： | 蔡翌辉 刘畅 郭豪杰 温艳 汪舟 谢乐春 |
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| 作者单位： | 现代汽车零部件技术湖北省重点实验室（武汉理工大学）,现代汽车零部件技术湖北省重点实验室（武汉理工大学）,现代汽车零部件技术湖北省重点实验室（武汉理工大学）,现代汽车零部件技术湖北省重点实验室（武汉理工大学）,现代汽车零部件技术湖北省重点实验室（武汉理工大学）,现代汽车零部件技术湖北省重点实验室（武汉理工大学） |
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| 基金项目： | 武汉理工大学自主创新研究(WUT 2018IVA063,2018IVA064),湖北省“楚天学子”人才计划启动基金(CTXZ2017-05), “新能源汽车科学与关键技术学科创新引智基地”资助(B17034) |
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| 摘 要： | 结合柴油机活塞发展现状,针对某型号高强度柴油机,利用SolidWorks建立该柴油机活塞的三维模型,并用ANSYS对活塞进行有限元分析,讨论活塞在高温环境、最高燃烧压力或最大侧向力作用下的温度场、应力分布和变形情况*分析结果表明,活塞主要承受热应力和热变形,最大耦合应力在油道顶部,约270 MPa,最大变形出现在活塞顶部边缘,变形量约0.08%,变形随活塞高度降低而减小,在裙部略有上升*活塞头部在销孔方向上热变形大于耦合变形,两者差值随活塞头部高度降低而减小*活塞在垂直于销孔轴线方向上的耦合变形总体上大于平行于销孔方向的耦合变形。同时,燃烧室喉口、环槽和销座处应力集中明显,针对上述薄弱区域进行结构改进,发现改进后应力值均显著降低,这些结构改进对高强度柴油机活塞设计开发具有重要指导意义。
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| 关 键 词： | 柴油机活塞 应力场 温度场 有限元 结构改进 |
| 收稿时间： | 2019/5/30 0:00:00 |
| 修稿时间： | 2019/7/28 0:00:00 |
Finite Analysis of Temperature and Stress Fields and Structural Improvements for a Heavy-Duty Diesel Piston |
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| CAI Yihui,LIU Chang,GUO Haojie,WEN Yan,WANG Zhou,XIE Lechun.Finite Analysis of Temperature and Stress Fields and Structural Improvements for a Heavy-Duty Diesel Piston[J].Chinese Internal Combustion Engine Engineering,2020,41(1):1-11. |
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| Authors: | CAI Yihui LIU Chang GUO Haojie WEN Yan WANG Zhou XIE Lechun |
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| Affiliation: | Key laboratory of modern automobile parts technology of Hubei provinceWuhan university of technology,Key laboratory of modern automobile parts technology of Hubei provinceWuhan university of technology,Key laboratory of modern automobile parts technology of Hubei provinceWuhan university of technology,Key laboratory of modern automobile parts technology of Hubei provinceWuhan university of technology,Key laboratory of modern automobile parts technology of Hubei provinceWuhan university of technology,Key laboratory of modern automobile parts technology of Hubei provinceWuhan university of technology |
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| Abstract: | In this paper, based on the development of the piston of diesel engine, a three-dimensional model of the piston of a certain type of high-strength diesel engine has been established with SolidWorks, and the finite element analysis of the piston with ANSYS has been carried out to discuss the temperature field, stress distribution and deformation of the piston under the high temperature, maximum explosive pressure or maximum lateral force. Analysis results show that the piston mainly suffers the thermal stress and thermal deformation. The maximum coupling stress on the top of the cool oil duct is about 270 MPa. The biggest defor-mation appears on the edge of the piston at the top, nearly 0.08%. The deformation decreases along with the piston height de-creases, but in the skirt increases slightly. The thermal deformation of piston head in the direction of parallel to the pin hole is greater than the coupling deformation, and the difference decreases with the decrease of piston head height. The coupling defor-mation of piston in the direction of perpendicular to the axis of the pin hole is almost greater than that in the direction of parallel to the pin hole. At the same time, it is found that the stress concentration at the throat of the combustion chamber, ring groove and pin seat is obvious. The structural optimization for the above weak areas has been carried out, and the stress after improve-ment is found significantly reduced. These structural modification have significant influence for the design and development of diesel engine piston with high strength. |
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| Keywords: | diesel piston stress field temperature field finite element analysis structure modification |
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