摘要
针对某乘用车排气系统流动性能较差的问题,采用数值计算与实验验证相结合的方法,对排气系统进行优化设计。通过构建排气系统数值分析模型,采用三维计算流体动力学方法,获得了排气系统的流动特性。实验结果表明,通过控制插入管长度、穿孔直径等参数,优化了排气系统的流动性能,降低了排气背压和气流噪声。在发动机全转速下,优化后排气系统背压值明显降低,流动性能得到改善,满足整车性能要求。
To achieve optimum flowing performance of a passenger vehicle exhaust system,numerical calculation combined with experimental verification has been used to optimize the design of the exhaust system.By constructing anumerical analysis model of the exhaust system,the flowing characteristics in the exhaust system are obtained based on the three-dimensional computational fluid dynamics method.According to the experimental and analytical results,the flowing properties were optimized by controlling the diameter of the insertion tube and the diameter of the perforation,thereby reducing the exhaust back pressure and airflow noise.The experimental results show that the back pressure value of the optimized exhaust system is significantly reduced under the full engine speed,and the flow performance is improved thus meeting the vehicle performance requirements.
作者
刘志恩
伍杨民
邹斌
黄涛
潘隆
吴旭昌
LIU Zhien;WU Yangmin;ZOU bin;HUANG Tao;PAN Long;WU Xuchang(Hubei Province Key Laboratory of Modern Automotive Technology,Wuhan University of Technology,Wuhan 430070,China;Hubei Collaborative Innovation Center for Automotive Components Technology,Wuhan University of Technology,Wuhan 430070,China)
基金
满足国Ⅵ标准的替代燃料车排放控制后处理系统技术研究资助项目(2016YFC0204904)
中央高校基本科研业务费专项资金资助(2017II31GX)
关键词
排气系统
流动性能
排气背压
气流噪声
exhaust system
flowing performance
back pressure
airflow noise
