摘要
发动机排气歧管工作环境恶劣,容易产生热应力和热负荷,造成局部变形甚至热裂漏气等故障。对排气歧管温度场以及热应力、热变形的分析有利于指导排气歧管的设计,提高排气歧管疲劳寿命。选取不同的入口边界条件,分析排气歧管的内流场温度,并采用顺序流固耦合方法,计算排气歧管的热应力和热变形。结果表明,排气歧管入口温度越高、速度越大,内流场温度差就越大,最低温度也越高;在排气歧管入口处及出口处热应力和热变形均较大,最大热应力为320MPa。
Engine exhaust manifold is in a bad working condition,its thermal stress and thermal load are easily generated,leads the exhaust manifold to deformation and even break.The analysis of temperature field and thermal load can guide the design of the exhaust manifold and improve its fatigue life.Taking the different inlet boundary conditions as objects,it analyzes the internal flow field temperature of exhaust manifold,and calculates thermal stress and thermal deformation of exhaust manifold with sequential fluid-solid coupling method.The results show that the higher the inlet temperature and velocity of the inlet,the higher temperature range and minimum temperature are,the thermal stress and thermal deformation at the inlet and outlet of the exhaust manifold are larger,and the maximum thermal stress is 320 MPa.
出处
《机械设计与制造工程》
2017年第12期13-17,共5页
Machine Design and Manufacturing Engineering
基金
国家自然科学基金资助项目(51375170)
广州市科技计划项目(201707020045)
工业产品环境实验室国家重点实验室开放基金项目
关键词
排气歧管
流固耦合
温度场
热应力
exhaust manifold
fluid - solid couple
temperature field
thermal stress
