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Fundamentals of CavitationVortex Cavitation

Fundamentals of Cavitation: Vortex Cavitation 10. VORTEX CAVITATION Coherent vortices are observed in many flow situations. Generally, rotational structures generate low pressure regions inside the liquid itself, whereas the minimum pressure occurs at the liquid boundary for irrotational flows. Such pressure drops can be very intense, so that vortex cavitation often starts for high values of the cavitation number in comparison with other types of cavitation. Different kinds of vortices exist according to their mode of production. We can distinguish the case of well-shaped, almost steady state vortices (treated in the present chapter), from the rotational coherent structures observed in shear flows, which are deeply affected by turbulence (see chap. 11). While the former are usually attached to solid bodies which continuously supply them with circulation, the latter are free and their life time can be short due to viscous dissipation. Examples of the first of these include apex vortices developed along the leading edge of delta wings, hub vortices trailing downstream of a propeller hub, tip vortices which occur at the tip of lifting foils and propeller blades. From the second group there are the alternate BÉNARD-KÁRMÁN vortices behind bluff bodies, the vortices formed in shear layers at the frontiers of wakes and http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png

Fundamentals of CavitationVortex Cavitation

Part of the Fluid Mechanics and Its Applications Book Series (volume 76)
Fundamentals of Cavitation — Jan 1, 2005
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Publisher
Springer Netherlands
Copyright
© Springer Science + Business Media, Inc. 2005
ISBN
978-1-4020-2232-6
Pages
223 –246
DOI
10.1007/1-4020-2233-6_10
Publisher site
See Chapter on Publisher Site

Abstract

10. VORTEX CAVITATION Coherent vortices are observed in many flow situations. Generally, rotational structures generate low pressure regions inside the liquid itself, whereas the minimum pressure occurs at the liquid boundary for irrotational flows. Such pressure drops can be very intense, so that vortex cavitation often starts for high values of the cavitation number in comparison with other types of cavitation. Different kinds of vortices exist according to their mode of production. We can distinguish the case of well-shaped, almost steady state vortices (treated in the present chapter), from the rotational coherent structures observed in shear flows, which are deeply affected by turbulence (see chap. 11). While the former are usually attached to solid bodies which continuously supply them with circulation, the latter are free and their life time can be short due to viscous dissipation. Examples of the first of these include apex vortices developed along the leading edge of delta wings, hub vortices trailing downstream of a propeller hub, tip vortices which occur at the tip of lifting foils and propeller blades. From the second group there are the alternate BÉNARD-KÁRMÁN vortices behind bluff bodies, the vortices formed in shear layers at the frontiers of wakes and

Published: Jan 1, 2005

Keywords: Chord Length; Vortex Tube; Cavitation Number; Nucleus Density; Vortex Strength

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