Abstract
An analysis is made of the frequency spectrum of the sound produced by low Mach number turbulent boundary layer flow over an inlet in a nominally plane wall. The inlet consists of a region of the wall perforated with an array of circular apertures, and communicates with a duct of uniform cross-section. Sound is generated by the diffraction of turbulence pressures by the aperture edges and by the unsteady pumping of fluid through the apertures. An examination is made of the dependence of the radiation on the number of apertures, their size relative to the thickness of the boundary layer, and on the acoustic impedance of the duct, including the influence of low-frequency duct resonances. A comparison is made with the sound radiated from the boundary layer turbulence in the absence of the perforated inlet.
Published Version
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