噪声与振动控制

›› 2011, Vol. 31 ›› Issue (4): 160-164.DOI: 10.3969/j.issn.1006-1355-2011.04.038

• 7.减振降噪设备和器材 • 上一篇    下一篇

进出口位置对不同形状膨胀腔消声特性的影响

方智1,季振林2   

  1. （ 哈尔滨工程大学 动力与能源工程学院， 哈尔滨 150001 ）
  • 收稿日期:2010-11-24 修回日期:2011-01-06 出版日期:2011-08-18 发布日期:2011-08-18
  • 通讯作者: 季振林

Effect of Inlet and Outlet Locations on Acoustic Attenuation Characteristics of Elliptical and Oval Expansion Chambers

<FONT face=Verdana><a href="https://nvc.sjtu.edu.cn/EN/article/advancedSearchResult.do?searchSQL=(((FANG Zhi .J I Zhen-lin[Author]) AND 1[Journal]) AND year[Order])" target="_blank">FANG Zhi .J I Zhen-lin</a></FONT>   

  1. ( College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China )
  • Received:2010-11-24 Revised:2011-01-06 Online:2011-08-18 Published:2011-08-18

摘要： 使用有限元法计算椭圆形和跑道圆形截面膨胀腔的声学模态，分析进出口管位置对膨胀腔消声特性的影响。结果表明，同轴膨胀腔的第一个可传播的高阶模态为第3阶模态，出口置于该模态的节线处，可以消除该阶模态的影响，使平面波频段拓宽，膨胀腔的消声性能得到改善。进出口管偏置的膨胀腔，第1阶模态被激发，三维波效应在较低频率出现，中频消声性能变差。

关键词: 声学, 椭圆形截面膨胀腔, 跑道圆形截面膨胀腔, 声学模态, 消声特性

Abstract: The acoustic modes of elliptical and oval expansion chambers are calculated using the finite element method, and the effects of inlet and outlet locations on the acoustic attenuation characteristics of the expansion chambers are studied. The numerical results show that the first propagation mode for the concentric expansion chambers is the third mode. The effect of the third mode can be eliminated by locating the outlet on the nodal line of this mode, and with this method the range of plane wave can be expanded and the acoustic attenuation performance of the expansion chambers can be improved. For the expansion chambers with offset inlet and outlet, the first mode is excited and the three-dimensional wave effects appear at lower frequencies, and the acoustic attenuation performance becomes poorer in the middle frequency range.

Key words: acoustics, elliptical expansion chambers, oval expansion chambers, acoustic mode, acoustic attenuation characteristics

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