Abstract
Keywords:
Exhaust manifold, Computational fluid dynamics (CFD), Thermal stress, Gas temperature, Heat transfer coefficient
Abstract
The exhaust manifold experiences rapidly varying load under harsh operating conditions, resulting from high temperature exhaust gases, which also show time-varying behavior. This paper presents first how to predict timevarying gas temperature and convective heat transfer coefficient of gas neighboring the inside surface of the exhaust manifold through finite volume method. Then these results obtained using the finite volume mesh constructed for the computational fluid dynamics analysis, are mapped onto the finite element mesh created for the heat transfer analysis. Subsequently, the exhaust manifold temperature calculated from heat transfer analysis based on CFD analysis results is compared with experimental data. Finally, thermal stress analysis is performed by taking account of assembly bolt load and nonlinear material properties.