Thermal Fluid-Structure Coupling Analysis of Engine Exhaust Manifold
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摘要: 发动机在正常工作时所产生的高温废气直接与排气歧管内壁管道接触,因而会对排气歧管造成较大的热变形,严重时甚至导致破坏。该文重点对某四缸发动机排气歧管受热情况进行了分析,通过采用有限元法设定了边界条件和外部环境参数,模拟了排气歧管的正常工作情况。为了探究影响排气歧管温度变化的因素,改变内部流体温度和速度以及对流换热系数的数值,观察排气歧管温度变化的情况,并对可能影响排气歧管受热的因素进行了分析与比较。Abstract: When the engine is working normally, the high temperature exhaust gas is directly in contact with the inner wall pipe of the exhaust manifold, causing large thermal deformation to the exhaust manifold and even leading to damage. In this paper, the heating condition of exhaust manifold of a four-cylinder engine is analyzed. The finite element method is used to simulate the normal operation of exhaust manifold by setting the boundary conditions and the external environment parameters. In order to explore the factors affecting the change of exhaust manifold temperature, the change of exhaust manifold temperature is observed through changing the internal fluid temperature and velocity, as well as the value of convective heat transfer coefficient. The factors that may affect the heating of exhaust manifold are analyzed and compared.
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