A Method of Mitigating Pulsation in Ventilated Supercavities

Grant M. Skidmore; Timothy A. Brungart; Jules W. Lindau; Michael J. Moeny

doi:10.1088/1742-6596/656/1/012170

A Method of Mitigating Pulsation in Ventilated Supercavities

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

Applied Research Laboratory (ARL)

Research output: Contribution to journal › Conference article › peer-review

2 Scopus citations

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 language	English (US)
Article number	012170
Journal	Journal of Physics: Conference Series
Volume	656
Issue number	1
DOIs	https://doi.org/10.1088/1742-6596/656/1/012170
State	Published - Dec 3 2015
Event	9th International Symposium on Cavitation, CAV 2015 - Lausanne, Switzerland Duration: Dec 6 2015 → Dec 10 2015

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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10.1088/1742-6596/656/1/012170

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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.",

author = "Skidmore, {Grant M.} and Brungart, {Timothy A.} and Lindau, {Jules W.} and Moeny, {Michael J.}",

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doi = "10.1088/1742-6596/656/1/012170",

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T1 - A Method of Mitigating Pulsation in Ventilated Supercavities

AU - Skidmore, Grant M.

AU - Brungart, Timothy A.

AU - Lindau, Jules W.

AU - Moeny, Michael J.

PY - 2015/12/3

Y1 - 2015/12/3

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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