Sound transmission losses across expansion chambers with staggered sub-chambers in a low Mach number duct

Shiu Keung Tang, Yijia Tang

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

2 Citations (Scopus)

Abstract

The sound transmission loss of a conventional expansion chamber is limited by its length and the area ratio. This phenomenon can be improved by appropriate staggering of the sub-chambers as shown in a previous study. However, the sound transmission loss will be reduced in the presence of a low Mach number duct flow. In the present study, the sound transmission losses across expansion chambers formed by two staggered chambers in the presence of low Mach number turbulent flows of velocities between 0 to 20 m/s were measured experimentally. Pressure measurements are also carried out simultaneously with the sound transmission loss measurements for a better understanding on the correlation between incident sound and the sound pressure within the chambers. It is found that the frequencies of high sound transmission loss correspond to those where a low pressure region in the chambers is observed. The increase in flow velocity makes such correlation less distinctive. Large scale shear layer rollup is not observed in this velocity range.
Original languageEnglish
Title of host publicationINTER-NOISE 2015 - 44th International Congress and Exposition on Noise Control Engineering
PublisherThe Institute of Noise Control Engineering of the USA, Inc.
Publication statusPublished - 1 Jan 2015
Event44th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2015 - San Francisco Marriott Marquis Hotel, San Francisco, United States
Duration: 9 Aug 201512 Aug 2015

Conference

Conference44th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2015
CountryUnited States
CitySan Francisco
Period9/08/1512/08/15

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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