Partial Cavitation as Drag Reduction Technique and Problem of Active Flow Control

Amromin, Eduard; Mizine, Igor

doi:10.5957/mt1.2003.40.3.181

Cited by 5 publications

(2 citation statements)

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“…ventilated) partial and super cavities, which are composed primarily of non-condensable gas injected into the flow, have also been used to reduce friction drag on naval objects. Amromin & Minize (2003), Kawanami & Arndt (2011), Wosnik & Arndt (2013), and Karn et al (2016) examined the use of artificial cavities for drag reduction, along with Lay et al (2010), Mäkiharju et al (2013a) and Zverkhovskyi (2014). Ceccio (2010) provides a recent review.…”

Section: Introductionmentioning

confidence: 99%

The dynamics of partial cavity formation, shedding and the influence of dissolved and injected non-condensable gas

2017

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In the present study, the experimental set-up of Ganesh et al. (J. Fluid Mech., vol. 802, 2016, pp. 37–78) is used to examine the dynamics of a shedding cavity by examining the vapour production rate of the natural cavity and determining how minimal injection of non-condensable gas can substantially alter the vapour production rate, the resulting cavity flow and the cavity shedding process. The influence of the dissolved gas content on the shedding natural cavity flow is also examined. High-speed visual imaging and cinemagraphic X-ray densitometry were used to observe the void fraction dynamics of the cavity flow. Non-condensable gas is injected across the span of the cavity flow at two locations: immediately downstream of the cavity detachment location at the apex of the wedge or further downstream into mid-cavity. The gas injected near the apex is found to increase the pressure near the suction peak, which resulted in the suppression of vapour formation. Hence, the injection of gas could result in a substantial net reduction in the overall cavity void fraction. Injection at the mid-cavity did less to suppress the vapour production and resulted in less significant modification of both the mean cavity pressure and net volume fraction. Changes in the cavity void fraction, in turn, altered the dynamics of the bubbly shock formation. Variation of the dissolved gas content alone (i.e. without injection) did not significantly change the cavity dynamics.

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Section: Introductionmentioning

confidence: 99%

The dynamics of partial cavity formation, shedding and the influence of dissolved and injected non-condensable gas

2017

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“…Сьогодні проблема керування потоком залишається актуальною. Одним із способів зменшення опору є створення на обтічній поверхні порожнини, що заповнена парою або повітрям [1,2], який в [3] називається суперкавітацією.…”

Section: вступunclassified

Modeling of a Ventilated Cavity Behind a Streamlined Body

Voropaiev¹,

Korobov²,

Димитриева³

2021

JNAM

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The results of physical and numerical modeling of a ventilated air cavity behind a streamlined body are presented. The results of laboratory experiments to determine the amount of gas flowing from the ventilated cavity are presented. It is formed behind the cavitator depending on a number of geometric and dynamic parameters. Numerical simulation of non-stationary 3D two-phase flow was performed on the basis of open source software OpenFOAM. The influence of gas blowing parameters on the formation of an air cavity, size, shape and stability has been investigated. Good qualitative agreement with experimental data was obtained. It is shown that the thickness of the ventilated cavity is determined by the diameter of the cavitator regardless of the diameter of the blow hole, and the increase in velocity or gas flow rate has a positive effect on the length and stability of the formed cavity.

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Time-scale for critical growth of partial and supercavitation development over impulsively translating projectiles

Weiland

Vlachos

2012

International Journal of Multiphase Flow

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Partial Cavitation as Drag Reduction Technique and Problem of Active Flow Control

Cited by 5 publications

References 0 publications

The dynamics of partial cavity formation, shedding and the influence of dissolved and injected non-condensable gas

The dynamics of partial cavity formation, shedding and the influence of dissolved and injected non-condensable gas

Modeling of a Ventilated Cavity Behind a Streamlined Body

Time-scale for critical growth of partial and supercavitation development over impulsively translating projectiles

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