摘要
由于排气歧管承受着来自发动机气缸内交变的高温载荷,复杂结构会造成局部温度过高,进而会造成排气歧管的局部变形,这样有可能导致排气歧管出现漏气或者开裂的情况。基于上述排气歧管存在的缺陷,文章以某车型1.6L排量发动机四合一结构形式的排气歧管,运用流固耦合理论研究其工作时所承受的高温载荷。在ANYSY Workbench平台中将排气歧管内部流体与其结构进行耦合传热计算,计算得到两种安装约束条件下的结构热应力、热变形的数值分布,并根据计算结果对排气歧管的热疲劳失效进行综合分析,预测了其热疲劳寿命。
Due to the exhaust manifold under high temperature load from the engine cylinder alternating,complexstructure will cause local temperature is too high,which will cause local deformation of the exhaust manifold,which maylead to the exhaust manifold of leakage or cracking.Based on the defects existing in the exhaust manifold of a vehicleengine1.6L four in one structure,using the fluid-structure coupling theory to study the high temperature load.In theANYSY Workbench platform,the coupled heat transfer calculation of the internal flow and the structure,the numericalvalues of thermal stress and thermal deformation under two kinds of installation constraints are calculated,according tothe calculation results,the thermal fatigue failure of the exhaust manifold is analyzed.
作者
唐鹏
付景顺
Tang Peng;Fu Jingshun(Shenyang University of Technology, Liaoning Shenyang 110870)
出处
《汽车实用技术》
2017年第10期56-58,共3页
Automobile Applied Technology
关键词
排气歧管
流固耦合
热负荷
疲劳寿命
exhaust manifold
fluid-structure coupling
heat load
fatigue life
