基于线阵列的湍流边界层壁面脉动压力波数-频率谱模型实验研究OA北大核心CSTPCD

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.