高阶声模态对扩张室消声器声学性能的影响研究  

Study on the Effect of High Order Acoustic Mode on Acoustic Performance of Expansion Chamber Muffler

作　　者：葛隽宇 张杰 郭文亮 GE Jun-yu;ZHANG Jie;GUO Wen-liang(College of Mechanical and Vehicle Engineering,Taiyuan University of Technology,Shanxi Taiyuan 030024,China;Precision Machining of Shanxi Province Key Laboratory,Shanxi Taiyuan 030024,China)

机构地区：[1]太原理工大学机械与运载工程学院,山西太原030024 [2]精密加工山西省重点实验室,山西太原030024

出　　处：《机械设计与制造》2021年第11期23-27,共5页Machinery Design & Manufacture

基　　金：山西省重点研发计划项目(201603D421016)。

摘　　要：由于煤矿风井截面很大,导致频率很低时风井消声器内部便激发了高阶声模态,消声器声学性能被大大影响。为改善消声器声学性能,利用管道声模态理论,对模态波激发频率和模态声压节线位置分布进行了分析和计算,对扩张室消声器进行了结构改进并利用LMS Virtual.Lab软件进行了声学仿真分析。为保证消声器的空气动力性能,又利用Fluent软件对消声器进行了流场仿真分析并进行了相应的结构优化。结果表明,经过结构优化的并联偏置消声器,可以在保持良好空气动力性能的同时,使消声器在低频段彻底摆脱高阶声模态带来的不利影响。Because of the large cross section of coal mine wind shaft,the high order acoustic mode is excited when the frequency is very low,and the acoustic performance of the muffler is greatly affected.In order to improve the acoustic performance of muffler,this paper deduces and calculates the excitation frequency of modal wave and the position of modal acoustic pressure nodal line by using pipeline acoustic mode.The structure of the exspansion chamber muffler is improved and the acoustic simulation of the muf⁃fler is carried out by using LMS Virtual.Lab software.In order to ensure the aerodynamic performance of muffler,the simulation analysis of flow field is carried out by using Fluent software and optimized corresponding structure.The results show that the par⁃allel bias muffler of structure optimized can keep good aerodynamic performance and make the muffler get rid of the adverse effect of high-order acoustic mode completely in low frequency band.

关 键 词：高阶声模态 扩张室消声器 激发频率 声压节线 声学性能 空气动力学性能 

分 类 号：TH16[机械工程—机械制造及自动化] TK422[动力工程及工程热物理—动力机械及工程]