挖掘机用复杂结构排气消声器的CFD仿真研究  

CFD Simulation of Exhaust Muffler with Complicated Structures for an Excavator

作　　者：方建华[1] 周以齐[1] 胡效东[2] 凌在山 

机构地区：[1]山东大学机械工程学院,山东济南250061 [2]山东科技大学机电学院,山东青岛266510 [3]山东众友工程机械有限公司,山东临沂276006

出　　处：《内燃机学报》2009年第1期68-73,共6页Transactions of Csice

基　　金：山东省科技攻关项目(2007GG3WZ04017)

摘　　要：建立了某挖掘机用复杂结构排气消声器的仿真模型,并利用CFD技术对消声器某入口流速下的流场进行了仿真,分析了该消声器内部气体的流动特性及压力分布特性,通过追踪消声器内部气体的踪迹发现内部的漩涡产生了较大噪声及压力损失,随着入口气体流速的增大,消声器出入口压力及总体压力损失都呈类似于抛物线的规律变化。研究了试验和仿真环境中,不同工况下消声器的压力损失,各种工况中,误差率在最低速时仅为5.5%,最高速时达到了20.5%,说明入口流速对于仿真结果有很大的影响。研究表明CFD方法研究消声器压力损失的有效性。The simulation model of the exhaust muffler with complicated structures was established, and its internal flow field at given inlet velocity was simulated with CFD method. The internal flow and pressure distribution were analyzed. By tracing the air flow in the muffler, it was found that the internal vortex produced a higher noise and pressure loss. With the increase of inlet velocity, both inlet/outlet pressure and total pressure loss exhibits a parabola CUlVe variations. The pressure losses of the muffler at different operating conditions were analyzed under experimental and simulation conditions, and the deviation at the lowest speed is 5.5% , but it reaches to 20.5% at the highest speed. The results show the large influence of inlet velocity on the simulation results. The study provides the feasibility of CFD method in studying the pressure loss of muffler.

关 键 词：复杂结构 消声器 CFD(计算流体力学) 压力损失 

分 类 号：TK413.4[动力工程及工程热物理—动力机械及工程]