Correlations of near-And far-field acoustic data in a high-speed jet

Jacques Lewalle, Kerwin R. Low, Mark N. Glauser, Zachary P. Berger

    Research output: Contribution to conferencePaperpeer-review

    2 Scopus citations

    Abstract

    The cross-correlations of near- and far-field pressure in a M=0.6 cold jet are oscillatory, which implies some phaselocking. A simple model and synthetic signals show that the locking may be related to the steep attenuation with distance from the near-field sensors. In the near-field, wavelet-based nonlinear filtering separates fluctuations that are recognizable at x/D = 3 and 6 ('matched') from the others ('residue'). This decomposition yields distinct signatures in the crosscorrelations. The corresponding time lags and frequencies in the cross-correlations point to several categories of sources and their locations. The interpretation is consistent with the eddy pairing or breakdown (i.e. loss of identity) as the sources of noise for short lags, but the longer time lags require another explanation.

    Original languageEnglish (US)
    StatePublished - 2011
    Event7th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2011 - Ottawa, Canada
    Duration: Jul 28 2011Jul 31 2011

    Other

    Other7th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2011
    Country/TerritoryCanada
    CityOttawa
    Period7/28/117/31/11

    All Science Journal Classification (ASJC) codes

    • Fluid Flow and Transfer Processes

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