Aeroacoustics of diffusers: an experimental study of typical industrial diffusers at Reynolds numbers of O(10[sup 5])

L.J. van Lier, S.M.N. Dequand, A. Hirschberg, J. Gorter

    Research output: Contribution to journalArticleAcademicpeer-review

    11 Citations (Scopus)
    2 Downloads (Pure)

    Abstract

    Diffusers as used in gas transport systems have an optimal pressure recovery but are unstable due to marginal flow separation. Coupling of diffuser flow oscillation with acoustic modes in a pipe has been demonstrated in a recent work by Kwong and Dowling [J. Fluids Eng. 116, 842 (1994)] to drive flow unsteadiness. Considered here in addition to the diffuser at a pipe termination is the aeroacoustic response of a diffuser in a long pipe. In both cases reflection coefficient measurements show that at moderate and low amplitudes of the acoustical particle velocity compared to the main flow velocity, diffusers are aeroacoustic sources similar to the whistler nozzle and the horn. This confirms the observations of Kwong and Dowling. At higher acoustical velocity amplitudes diffusers become strong absorbers, which can be explained in terms of a quasistationary flow model. Finally, an indication is provided for possible remedial measures when a stable flow is needed.
    Original languageEnglish
    Pages (from-to)108-115
    JournalJournal of the Acoustical Society of America
    Volume109
    Issue number1
    DOIs
    Publication statusPublished - 2001

    Fingerprint

    Dive into the research topics of 'Aeroacoustics of diffusers: an experimental study of typical industrial diffusers at Reynolds numbers of O(10[sup 5])'. Together they form a unique fingerprint.

    Cite this