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Fundamentals of CavitationPartial Cavities

Fundamentals of Cavitation: Partial Cavities 7. PARTIAL CAVITIES Partial cavities usually develop in regions of separated flow. Initially, cavitation appears in the shear layers limiting such a region and, as the cavitation number is decreased, it spreads over the full separated region and often extends its original size. Partial cavities are encountered in two main practical situations, either on the upperside of foils and blades or in internal flows, such as Venturi nozzles. In the case of hydrofoils, as the cavitation number is further decreased, a partial cavity turns into a supercavity as soon as it no longer closes on the wall but downstream of the trailing edge. Hence, partial cavitation can be regarded as an intermediate stage of development of cavitation. On the contrary, partial cavities in internal flows are the ultimate stage since they obviously always close on the solid wall, whatever their size. Compared to supercavities, it is the aft region of partial cavities where the liquid flow reattaches to the wall which is of specific interest. While the conditions of detachment are the same for partial and supercavities, the presence of the wall makes the closure region different. The relatively small size of partial cavities can even allow the influence http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png

Fundamentals of CavitationPartial Cavities

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
131 –167
DOI
10.1007/1-4020-2233-6_7
Publisher site
See Chapter on Publisher Site

Abstract

7. PARTIAL CAVITIES Partial cavities usually develop in regions of separated flow. Initially, cavitation appears in the shear layers limiting such a region and, as the cavitation number is decreased, it spreads over the full separated region and often extends its original size. Partial cavities are encountered in two main practical situations, either on the upperside of foils and blades or in internal flows, such as Venturi nozzles. In the case of hydrofoils, as the cavitation number is further decreased, a partial cavity turns into a supercavity as soon as it no longer closes on the wall but downstream of the trailing edge. Hence, partial cavitation can be regarded as an intermediate stage of development of cavitation. On the contrary, partial cavities in internal flows are the ultimate stage since they obviously always close on the solid wall, whatever their size. Compared to supercavities, it is the aft region of partial cavities where the liquid flow reattaches to the wall which is of specific interest. While the conditions of detachment are the same for partial and supercavities, the presence of the wall makes the closure region different. The relatively small size of partial cavities can even allow the influence

Published: Jan 1, 2005

Keywords: Cavity Length; Adverse Pressure Gradient; Cavitation Erosion; Cavitation Number; Cavitation Inception

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