偏心进气结构EGR冷却器断裂分析及改进  

FRACTURE ANALYSIS AND IMPROVEMENT OF EGR COOLER WITH ECCENTRIC INTAKE STRUCTURE

作　　者：洪洋 郑师虔 沈海青[1] 赵国江 HONG Yang;ZHENG ShiQian;SHEN HaiQing;ZHAO GuoJiang(School of Automotive and Information Engineering,Taizhou Vocational College of Science&Technology,Taizhou 318020,China;Zhejiang Bondlye Environmental Technology Co.,Ltd.,Taizhou 317000,China)

机构地区：[1]台州科技职业学院汽车与信息工程学院,台州318020 [2]浙江邦得利环保科技股份有限公司,台州317000

出　　处：《机械强度》2021年第2期505-508,共4页Journal of Mechanical Strength

基　　金：国家重点研发计划资助项目(2017YFC0211201);浙江省教育厅一般科研项目(Y201941287);浙江省教育厅高等学校国内访问工程师课题“校企合作项目”(FG2019221)资助。

摘　　要：针对某偏心进气结构EGR冷却器出现的螺旋管与主片焊接断裂问题,对EGR冷却器进行基于顺序流固耦合的数值仿真和偏心进气结构改进。根据EGR冷却器的三维数模,建立EGR冷却器流场网格与固体有限元网格,构建了流场分析、热传导分析和热应力分析的顺序流固耦合仿真流程,分析了进气结构、气侧流线、固体温度、热应力范围和断口之间的联系,提出通过增加进气流道凸台的方法提升气体均匀性、减少局部热应力范围的改进方案。研究结果表明,基于流场分析、热传导分析、热应力分析的顺序流固耦合方法在工程实践中是可行的,不合理的偏心进气结构可导致EGR冷却器局部断裂,通过优化流道的方法显著减少局部热应力范围,解决EGR冷却器开裂问题。Aiming at welding fracture problem of EGR cooler with eccentric intake structure,numerical simulation based on sequential fluid-solid coupling was presented and the improvement of eccentric intake structure was taken. Flow field mesh and solid finite element mesh were set up based on 3 D modeling. The sequential fluid-solid coupling with flow field analysis,heat conduction analysis and thermal stress analysis was taken to study the relation among intake structure,gas side streamline,solid temperature,thermal stress range and the fracture. An improvement scheme with increasing a hump was proposed to improve gas uniformity and reduce local thermal stress range. The results indicate that the sequential fluid-solid coupling is feasible in engineering practice,the partial fracture of EGR cooler will caused by unreasonable eccentric intake structure and will be solved by optimization of flow passage.

关 键 词：顺序流固耦合 偏心进气结构 断裂分析 EGR冷却器 

分 类 号：TH12[机械工程—机械设计及理论]