The acoustic performance of a dual Helmholtz resonators system in the presence of a grazing flow

Rong Xue, Cheuk Ming Mak, Dizi Wu, Kuen Wai Ma

Research output: Journal article publicationJournal articleAcademic researchpeer-review

1 Citation (Scopus)

Abstract

Helmholtz resonators (HR) are widely used in aero-engine systems for noise reduction. By connecting a pair of HRs in series (neck-cavity-neck-cavity), a dual HRs system is formed. This study investigated the influence of neck length, cavity volume and flow Mach number on the noise attenuation performance of a dual HRs system. A three-dimensional numerical simulation was performed to calculate the transmission loss results. The transmission loss (TL) results indicated that the second neck length can influence the second resonance frequency and TL max. Changing the cavity volume significantly influences the noise attenuation ability under lower flow rate conditions compared to higher flow rate conditions. The flow Mach number had a more significant impact on the first TL peak than on the second TL peak. This study shows the relationship between the geometric parameters, grazing flow and noise attenuation performance of a dual HRs system and could provide guidance in designing suitable dual HRs for aero-engine systems.

Original languageEnglish
Pages (from-to)23-40
Number of pages18
JournalInternational Journal of Aeroacoustics
Volume22
Issue number1-2
DOIs
Publication statusPublished - Mar 2023

Keywords

  • aeroacoustics
  • grazing flow
  • Helmholtz resonator
  • noise attenuation
  • transmission loss

ASJC Scopus subject areas

  • Aerospace Engineering
  • Acoustics and Ultrasonics

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