The Attenuation of Flow-Induced Cavity Noise in a Wind-Tunnel by Micro-Perforations

Experimental studies have been carried out to assess the effect on the pressure-developed turbulent boundary layer. Measurements in transitional to 8 dB of the dominant tonal peaks in the base wall on one-third of the cavity floor towards the leading edge. They are identified as transverse tunnel-cavity resonances the thin panel flexural modes. However, the micro downstream of the attenuation zone to attenuate the broadband pressure fluctuations. Two-dimensional Lattice a transitional cavity mounted in a waveguide and undergoing a low boundary layer. The calculated wall pressure spectra confirmed the existence of transverse tunnel-cavity resonances as well as their attenuation at the base and at the mouth of the cavity by inserting a micro dissipation of energy is concentrated within and at the inlet apertures which correspond to regions of maximum velocity fluctuations.