Abstract
Wall pressure fluctuations associated with equilibrium turbulent boundary layer air flow have been measured in two anechoic flow facilities over a range of flow rates. The pressure field was probed with arrays of microphones. The multichannel signal data from the microphones was synchronously digitized and digitally processed to resolve the dependence of the turbulent pressure field on both (temporal) frequency and (spatial) wavenumber. Spectral estimates of the wall pressure field around the convective ridge and in the low‐wavenumber region will be presented. Contributions of observed coherent pressure structures to the spectral estimates will be discussed. [Research sponsored by ONR.]
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