双层管消声器的仿真分析

Simulation Analysis of Two Layers Perforated Tube Muffler

运用LMS Virtual.Lab对一穿孔管消声器进行仿真,仿真结果和试验结果吻合较好;在此基础上在膨胀腔的1/3处加一层穿孔管,并对不同穿孔率组合进行研究。结果表明:双层穿孔管消声器的声学特性在中高频率明显比原来单层消声器的要好。同时使用Fluent软件对其空气动力学性能进行研究,结果表明:改进后的消声器压力损失和原始的消声器并无大的差别。

The simulation of a perforated tube muffler was performed by using LMS Virtual.Lab software,and the simulation results coincide well with the experimental results.Another layer of perforated pipe was added at 1/3 of the expansion chamber with the original structure unchanged,and combinations of different perforation rate were studied.The results show that the acoustic characteristics of the double-perforated muffler are obviously better than the original one on the middle and high frequency.And analysis of aerodynamic was performed by Fluent software.The results show that the pressure loss between the improved muffler and the original muffler model is not very obvious.