Abstract
The results of an experiment to determine the effect of flow-induced noise on a pressure-acceleration intensity probe are presented. The sensor is a bluff body that conforms to the geometry of a right circular cylinder having a diameter of 10.16 cm and an aspect ratio of unity. A flexural mode hydrophone is used to measure the acoustic pressure and a flexural mode accelerometer is used to measure the acoustic particle acceleration. The hydrophone has a nominal sensitivity of about −185 dB re: 1 V/uPa and the accelerometer has an in-water acoustic sensitivity of nearly 1 V/g. The bandwidth of the device covers the 10-Hz to 1-kHz frequency range and the principle axis of sensitivity is coincident with the axis of the cylinder. The sensor was towed in cross-flow at speeds ranging from 0.1 to 0.5 cm/s and data were collected over the 10-Hz to 100-Hz frequency range. Of particular interest is the decomposition of the intensity spectrum into real and reactive parts along with an assessment of any filtering that can be accomplished using the intensity technique to measure far-field sound in the presence of near-field noise. [Work supported by various grants from ONR and NAVAIR.]
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