大功率柴油机抗性消声器性能建模分析

Modeling and Analysis on Performance of Resistance Muffler of Uprated Engine

在排气系统安装消声器是汽车尾气噪声控制最有效的办法,实现消声器高性能、低压损是排气噪声控制的理想目标。基于排气噪声产生机理及控制方法,根据大功率柴油机排气特点和设计要求,针对QSK19柴油发动机符合要求的抗性消声器进行初步设计。采用ANSYS、GAMBIT分别建立其有限元分析模型,采用SYSBOTISE对其进行声学分析,采用FLUENT进行空气动力学分析。根据模型分析结果对原设计进行改进设计,在减小原有体积的基础上,同时满足消声和空气背压的要求,为同类大功率柴油发动机消声器设计和改进提供参考。

In the exhaust system, the muffler is the most effective way to control the noise of automobile exhaust. It is an ideal target to achieve high performance and low pressure loss of muffler. Based on the mechanism and control method of exhaust noise, according to the characteristics and design requirements of uprated engine, design resistance muffler with the requirements of the QSK19 diesel engine is preliminarily designed. The finite element analysis models were established by ANSYS and GAMBIT, which use SYSBOTISE analysis acoustic and FLUENT analysis aerodynamics of the muffler. According to the analysis results, the design of the original design was improved, which reduce the original size, to meet the requirements of the noise and air pressure. The work of simulation analysis about muffler provides a reference in the muffler design, especially to the muffler for uprated engine.