Investigation of the Behavior of Ventilated Supercavities

Kawakami, Ellison; Arndt, Roger E. A.

doi:10.1115/fedsm-icnmm2010-30984

Cited by 12 publications

(18 citation statements)

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“…It has been observed that a stability parameter, β = (p ∞ − p v ) / (p ∞ − p c ) , i.e., the ratio of the vaporous cavitation number to the supercavity cavitation number, must be greater than 2.645 for pulsation to occur in a free-field environment ( Paryshev, 2003( Paryshev, , 2006Kirschner and Arzoumanian, 2008 ). During water tunnel testing, tunnel walls induce a blockage effect that can cause the above relations to deviate from their reported free-field values ( Tulin, 1961;Brennen, 1969;Logvinovich, 1969;Kawakami and Arndt, 2011 ). Note that in this paper the terms "supercavity" and "cavity" will be used interchangeably.…”

Section: Introductionmentioning

confidence: 86%

The control of ventilated supercavity pulsation and noise

Skidmore

Brungart

Lindau

et al. 2016

International Journal of Multiphase Flow

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Section: Introductionmentioning

confidence: 86%

The control of ventilated supercavity pulsation and noise

Skidmore

Brungart

Lindau

et al. 2016

International Journal of Multiphase Flow

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“…The dimensionless ventilated flow rate is a determinant parameter, while the Froude number causes the shape of ventilated supercavity to be unsymmetrical. Kawakami and Williams (2009) experimentally investigated the ventilated supercavitation formed behind a sharp-edged disk utilizing several different configurations. Zhang et al (2009) designed three different front profiles for supercavitating vehicles based on the cavity theory as well as the Granville streamlined Equation and tested them in a highspeed water tunnel.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Supercavitating Flow over Parabolic Cavitators

Moghimi¹,

Nouri²,

Molavi³

2017

JAFM

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In this paper experimental study was carried out to investigate supercavitation around parabolic cavitators. Various types of cavitators, such as disk, cone, and parabolic, were designed and manufactured. Also, the shape of the cavities formed behind these bodies were considered and compared. Dimensionless parameters such as dimensionless length and the diameter of the cavity as well as the dimensionless required air flow on the cavitators were obtained. The results showed that parabolic cavitators have an optimum design in comparison with the disk and cone cavitators due to their insignificant capability to reduce the drag force, yet the cavity's length has a moderate size. It was also observed that this type of cavitator is capable of forming a cavity with a dimensionless length up to L/d= 33 and a dimensionless width up to D/d= 3.6. Moreover, parabolic cavitators require the highest amount of air injected in comparison with the cone and disk types; therefore, they operate in lower cavitation numbers. Since no other experimental data has been reported so far, this work reports the experimental characteristic behavior of parabolic cavitators.

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“…The work presented herein is intended as a comparative study of the single-and double-spiral-vortex models applied to supercavitating jet flow past a wedge when the location and the side lengths of the wedge are arbitrary. Recently, Kawakami et al (2009) carried out some experiments in the high-speed water tunnel at St Anthony Falls Laboratory to study the ventilated supercavity formed behind a sharp-edged disk. They found that the dominant mode of the cavity-closure mechanism is the twin vortex mode while the re-entrant jet mode has been found to be unstable.…”

Section: Introductionmentioning

confidence: 99%

Single- and double-spiral-vortex models for a supercavitating non-symmetric wedge in a jet

Antipov

Zemlyanova

2009

Proc. R. Soc. A.

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The problem of determining the free surface of a jet incident on a rigid wedge and the boundary of a cavity behind the wedge is considered. The single-and double-spiral-vortex models by Tulin are used to describe the flow at the rear part of the cavity. The location of the wedge in the jet and the sides lengths are arbitrary. This circumstance makes the flow domain doubly connected for the single-vortex model while it is simply connected for the double-vortex model. Both models are solved in closed form by the method of conformal mappings. The maps are expressed through the solutions to certain RiemannHilbert problems. For the former model, this problem is formulated on a genus-1 Riemann surface. The double-vortex model requires the solution to a standard Riemann-Hilbert problem on a plane. By comparative analysis of the numerical results for the two models, it is found that the drag and lift are practically the same while the jet surface, the cavity boundary at the rear part and the deflection angle of the jet at infinity are different. Also, the problem of determining the parameters for the conformal mapping in the single-vortex model has two solutions. It is shown that one of the solutions leads to a non-physical shape of the cavity and needs to be disregarded.

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Investigation of the Behavior of Ventilated Supercavities

Cited by 12 publications

References 0 publications

The control of ventilated supercavity pulsation and noise

The control of ventilated supercavity pulsation and noise

Experimental Investigation on Supercavitating Flow over Parabolic Cavitators

Single- and double-spiral-vortex models for a supercavitating non-symmetric wedge in a jet

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