Prediction of flow-generated noise produced by acoustic and aerodynamic interactions of multiple in-duct elements

Ning Han, Cheuk Ming Mak

Research output: Journal article publicationJournal articleAcademic researchpeer-review

10 Citations (Scopus)


Flow-generated noise problem caused by in-duct elements is due to the complicated acoustic and turbulent interactions of multiple in-duct flow noise sources. The approach of partially coherent sound fields used previously by Mak and Yang [C.M. Mak, J. Yang, Flow-generated noise radiated by the interaction of two strip spoilers in a low speed flow ducts, Acta Acust united with Acustica 88 (2002) 861-868] and Mak [C.M. Mak, A prediction method for aerodynamic sound produced by multiple elements in air ducts, J Sound Vib 287 (2005) 395-403] is adopted to formulate the sound powers produced by interactions of multiple elements at frequencies below and above the cut-on frequency of the lowest transverse duct mode. The study indicates that the level and spectral distribution of the additional acoustic energy produced by the interactions of multiple elements can be predicted based on the measured data with respect to the interactions. The proposed method can form a basis of a generalized prediction method for flow-generated noise produced by multiple elements. The application of the proposed method is supported by two engineering examples.
Original languageEnglish
Pages (from-to)566-573
Number of pages8
JournalApplied Acoustics
Issue number6
Publication statusPublished - 1 Jun 2008


  • Acoustic and aerodynamic interactions
  • Flow-generated noise
  • Multiple in-duct elements

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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