喻春凤，许涛，阮仁宇

安徽江淮汽车股份有限公司技术中心

摘要：本文采用稳态计算模式，使用k-zeta-f湍流模型以及多孔介质模型，分别对排气歧管的两种设计方案进行了仿真分析。通过CFD计算，得到了排气系统内流场的压力损失以及催化器载体前端的气流分布，结果证明，方案二各项指标均优于方案一。

关键词：汽油机、排气歧管、均匀性系数

Abstract: Using steady calculation mode, k-zeta-f turbulence model and porous media model, this paper did a CFD analysis on two kinds of exhaust manifolds, obtaining the Pressure loss of the internal flow-field in the exhaust system and gas flow distribution in front of the catalyst substrate by CFD. The results showed that No. 2 design scheme was better than No. 1 scheme.

Key Words: Gasoline Engine; Exhaust Manifold; Uniform Index