结合歧管式净化器的性能特点及失效模式总结出了产品设计开发的一般流程,通过CFD分析、FEA-模态分析、FEA-流固耦合热应力分析等方法对歧管进行了分析,提出了歧管式净化器设计是否合理的性能评价标准,用于评判产品设计的优劣.“,”Based on performance characteristics and failure mode of exhaust manifold catalytic converter,this paper summarizes general process of product design and development.Manifold is analyzed through computational fluid dynamics (CFD) analysis,finite element analysis (FEA) modal analysis,FEA fluid-solid coupling thermal stress analysis and other methods.The performance evaluation criterion for the design rationality of exhaust manifold catalytic converter is put forward to judge the quality of products.