Experimental investigation and modelling of the boundary- layer wall pressure spectrum

Abstract eng:
Wall pressure fluctuations beneath a turbulent boundary layer, and the modelling of the wall pressure spectrum, are investigated in this study. Various experimental conditions have been studied, such as the presence of a mean pressure gradient achieved by changing the ceiling angle of a rectangular channel designed for flow—acoustic measurements. Wall pressure spectra are measured by using a pinhole microphone in conjunction with a high—frequency—calibration procedure. A direct measurement of the wall pressure wavenumber—frequency spectrum is also performed with the use of a rotating linear antenna of remote microphones. Both aerodynamic and acoustic components of the wavenumber—frequency spectrum can thus be identified and are investigated. A short overview of the results is first reported and discussed. These experimental data, including the characterization of the turbulent boundary layer, are then systematically used to inform a wall pressure spectrum model.

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