An Experimental Investigation of the Noise Sources Associated With Submerged High Flow Acoustic Measurements

A study of the noise sources on an submerged housing designed to facilitate acoustic measurements in high flow situations was investigated experimentally. A scale-mode of the housing was mounted in a low speed wind-tunnel and mean and unsteady surface pressure measurements were taken all over the surface of the housing. The measurements indicate that flow-separation occurs on several of the model edges and that a protruding instrument housing produces a strong turbulent wake. The associated pressure fluctuations produce large, low frequencies fluctuations that are broadband along with discrete tones that occur at higher frequencies.