发动机排气管热应力分析.pdf

第 22 卷 增刊 2 计 算 机 辅 助 工 程 Vol. 22 Suppl. 2 2013 年 10 月 Computer Aided Engineering Oct. 2013 论文所属行业: 汽车 发动机排气歧管热应力分析 1 2 3 冀国微 ，魏丕勇 刘晓 （北汽福田汽车股份有限公司汽车工程研究院，北京，102206） 摘要：应用Fire软件建立排气歧管CFD计算分析模型，模拟计算发动机不同工况下的温度及换热系数， 用ABAQUS软件建立热机械疲劳分析模型，利用CFD结果中的温度和换热系数作为热机械疲劳分析的 边界条件，计算各工况点下的排气歧管的温度场及塑性变形等结果，并对结果进行评估，提出相应的 改善意见，为后续发动机零部件结构强度开发提供重要的理论依据，从而大大减少试验开发的工作量 和费用，加快开发进度。 关键词：汽油机; 排气歧管; ABAQUS; 热机械疲劳; 中图分类号： TB535 文献标识码：B Analysis of Thermal Stress for Engine Exhaust manifold 1 2 3 JI Guowei , WEI Piyong , LIU Xiao (Automotive Engineering Research Institute, BeiQi Foton Motor Co., Ltd , BeiJing,102206) Abstract: Use simulation soft Fire to build the CFD analysis model of exhaust manifold, simulate the temperature and heat transfer coefficient(HTC) in different engine working conditions. Firstly, use ABAQUS to build the thermal-mechanical failure analysis model. Then use the temperature and HTC from CFD result as the boundary condition to calculate the temperature field and plastic strain of the exhaust manifold in each conditions. At last to evaluate the result and giving the modified suggestion. This paper give an important theory basis for structural strength developing of the engine parts, this will highly reduce the testing workload and the cost , speed up the developing process as well. Key words: Engine; Exhaust manifold; ABAQUS; Thermo-Mechanical failure 断提高和排气温度的升高，排气歧管的热载荷也 1 前 言 不断增加，因而要求用耐热性特别是耐热疲劳和