Experimental study on spectrum of turbulent-boundary-Layer fluctuation pressure and response of a PVDF hydrophone

The point power spectrum density and the wavenumber frequency spectrum density of turbulent-boundary-layer fluctuation pressure are measured by use of a φ8 mm hydrophone and a 20-element array,respectively.The non-dimensional representation of measured point power spectrum coincides with the measured results by Bull M.K.et al.in wind tunnel.The convection peak can be seen clearly in the measured wavenumber frequency spectrum and the convection velocity can be calculated from the location of the convection peak.The response spectrum of a PVDF hydrophone,which receive area is 100 mm×60 mm,is also measured.By comparing it with the response spectrum of the φ8 mm hydrophone,it is shown that the PVDF hyrdophone has a strong wavenumber filtering effect on turbulent-boundary-layer pressure fluctuation.