Time-series analyses of wall pressure fluctuations in plume-induced separated flowfields

R. J. Shaw, J. C. Dutton, A. L. Addy

Research output: Contribution to journalArticlepeer-review


The separation shock wave motion in a plume-induced, boundary-layer separated flowfield was studied experimentally. The statistical properties of the shock wave motion were determined over the intermittent region using time-series analyses of wall static pressure fluctuation measurements. The standard deviation of the pressure fluctuations, nondimensionalized by the local mean pressure, reached a maximum of 0.22 near the middle of the intermittent region. The ratio of the maximum standard deviation of the pressure fluctuations over the intermittent region to the mean pressure difference across the intermittent region was calculated to be 0.43 for this flowfield. Both of these quantities demonstrate that the unsteady pressure loading caused by the shock wave motion has essentially the same magnitude in plume-induced separated flowfields as in flowfields produced by solid boundary protuberances.

Original languageEnglish (US)
Pages (from-to)1817-1824
Number of pages8
JournalAIAA journal
Issue number10
StatePublished - Oct 1998

ASJC Scopus subject areas

  • Aerospace Engineering


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