Noise generated by ventilated supercavities

• Autores: Grant M. Skidmore, Timothy A. Brungart, Jules W. Lindau, Michael J. Moeny
• Localización: Noise Control Engineering Journal, ISSN 0736-2501, Vol. 63, Nº. 1, 2015, págs. 94-101
• Idioma: inglés
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• Resumen

  • The noise generated by ventilated supercavities has been explored experimentally in a water tunnel facility. The most prominent acoustical characteristic is the monopole behavior exhibited by a ventilated supercavity in its pulsating closure regime. The interior cavity pressure and near-field radiated sound are monotonic with a frequency that is related to the speed and length of waves propagating on the supercavity gas/water interface. The cavity interior pressure spectrum level is shown to be related to the near-field and far-field noise spectrum level through spherical spreading of the sound waves from the supercavity interface. As a result, the cavity interior pressure can be used as a measure of the radiated noise. The noise radiated by a pulsating supercavity at the pulsation frequency is at least 40 dB above that radiated by comparable re-entrant jet and twin vortex cavities.