Experimental study of the turbulent-boundary-layer wall pressure fluctuation wavenumber-frequency spectrum models using linear array
Wavenumber-frequency spectrum modeling of wall pressure fluctuation has been the focus of the flow-induced noise in turbulent boundary layers.This study first summarized 11 models in the last six decades,classified into four groups,i.e.,Corcos-type,incompressible,compressible,and others.The performance of these models,further classified into Corocos-type and non-Corcos-type,was then examined by comparing their prediction with the experimental measurement using a linear array in an aeroacoustic wind tunnel.Results show that the linear array can measure the streamwise wavenumber-frequency spectrum correctly and,therefore,can be used to evaluate the accuracy of prediction models.The Corcos-type models have to be chosen based on the interested frequencies,wavenumbers,and the formula's complexity.The non-Corcos-type models can directly predict the wavenumber-frequency spectrum without the self-spectrum input,an advantage over the Corcos-type.Specifically,Chase-I model has the best ovserall performance;Chase-II can predict the acoustic-affected area.
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