Acoustic silencing in a flow duct with micro-perforated panel liners

Xiaoqi Zhang, Li Cheng

Research output: Journal article publicationJournal articleAcademic researchpeer-review

3 Citations (Scopus)

Abstract

Despite the increasing interest in Micro-perforated panels (MPPs) for various noise control applications, the acoustic behavior of MPP liners in flow ducts has not been fully apprehended. On the top of this is the lack of understanding on the influence of various design arrangements and system parameters on the performance of MPP-based acoustic silencing devices. Incorporating previously developed acoustic impedance formulae within the general framework of the Patch Transfer Function (PTF) framework, these issues are investigated in this paper in the context of a MPP liner, flush-mounted inside a flow duct wall. Numerical analyses reveal the effects of the grazing flow and different partition arrangements in the backing cavity of MPP liners on their silencing performance as well as the underlying physical phenomena. Capitalizing on the efficiency of the modelling approach, a system optimization is carried out. The numerically predicted noise attenuation results are validated through comparisons with experimental measurements under various grazing flow velocities. While shedding light on the underlying sound attenuation mechanism, studies provide guidelines for the design of MPP silencers in flow ducts.

Original languageEnglish
Article number107382
JournalApplied Acoustics
Volume167
DOIs
Publication statusPublished - Oct 2020

Keywords

  • Design guidelines
  • Flow ducts
  • MPP liners
  • Sound attenuation mechanisme
  • System optimization

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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