A Method of Mitigating Pulsation in Ventilated Supercavities

Grant M. Skidmore, Timothy A. Brungart, Jules Washington V. Lindau, Michael J. Moeny

Research output: Contribution to journalConference article

Abstract

A method for mitigating ventilated supercavity pulsation is presented. The method, which has its roots in parametric oscillators, shifts the supercavity resonance frequency by modulating its gas ventilation rate. When appropriately modulated, the supercavity is driven off resonance by the waves on the gas/water interface (that remain unchanged) and pulsation is, therefore, suppressed. Initial experimental results indicate that the gas ventilation rate modulation frequency must be sufficiently different from the supercavity resonance frequency to mitigate pulsation. If the modulation frequency is not sufficiently different from the supercavity resonance frequency, pulsation is simply shifted in frequency with a corresponding small reduction in the supercavity interior pressure spectrum level and radiated noise.

Original languageEnglish (US)
Article number012170
JournalJournal of Physics: Conference Series
Volume656
Issue number1
DOIs
StatePublished - Dec 3 2015
Event9th International Symposium on Cavitation, CAV 2015 - Lausanne, Switzerland
Duration: Dec 6 2015Dec 10 2015

Fingerprint

ventilation
frequency modulation
gases
parametric amplifiers
shift
water

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

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title = "A Method of Mitigating Pulsation in Ventilated Supercavities",
abstract = "A method for mitigating ventilated supercavity pulsation is presented. The method, which has its roots in parametric oscillators, shifts the supercavity resonance frequency by modulating its gas ventilation rate. When appropriately modulated, the supercavity is driven off resonance by the waves on the gas/water interface (that remain unchanged) and pulsation is, therefore, suppressed. Initial experimental results indicate that the gas ventilation rate modulation frequency must be sufficiently different from the supercavity resonance frequency to mitigate pulsation. If the modulation frequency is not sufficiently different from the supercavity resonance frequency, pulsation is simply shifted in frequency with a corresponding small reduction in the supercavity interior pressure spectrum level and radiated noise.",
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A Method of Mitigating Pulsation in Ventilated Supercavities. / Skidmore, Grant M.; Brungart, Timothy A.; Lindau, Jules Washington V.; Moeny, Michael J.

In: Journal of Physics: Conference Series, Vol. 656, No. 1, 012170, 03.12.2015.

Research output: Contribution to journalConference article

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T1 - A Method of Mitigating Pulsation in Ventilated Supercavities

AU - Skidmore, Grant M.

AU - Brungart, Timothy A.

AU - Lindau, Jules Washington V.

AU - Moeny, Michael J.

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N2 - A method for mitigating ventilated supercavity pulsation is presented. The method, which has its roots in parametric oscillators, shifts the supercavity resonance frequency by modulating its gas ventilation rate. When appropriately modulated, the supercavity is driven off resonance by the waves on the gas/water interface (that remain unchanged) and pulsation is, therefore, suppressed. Initial experimental results indicate that the gas ventilation rate modulation frequency must be sufficiently different from the supercavity resonance frequency to mitigate pulsation. If the modulation frequency is not sufficiently different from the supercavity resonance frequency, pulsation is simply shifted in frequency with a corresponding small reduction in the supercavity interior pressure spectrum level and radiated noise.

AB - A method for mitigating ventilated supercavity pulsation is presented. The method, which has its roots in parametric oscillators, shifts the supercavity resonance frequency by modulating its gas ventilation rate. When appropriately modulated, the supercavity is driven off resonance by the waves on the gas/water interface (that remain unchanged) and pulsation is, therefore, suppressed. Initial experimental results indicate that the gas ventilation rate modulation frequency must be sufficiently different from the supercavity resonance frequency to mitigate pulsation. If the modulation frequency is not sufficiently different from the supercavity resonance frequency, pulsation is simply shifted in frequency with a corresponding small reduction in the supercavity interior pressure spectrum level and radiated noise.

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