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Fundamentals of CavitationSupercavitation

Fundamentals of Cavitation: Supercavitation 6. SUPERCAVITATION As the cavitation parameter is decreased, a small cavity attached to a hydrofoil will extend and grow longer and longer. It becomes a supercavity as soon as it ceases to close on the cavitator wall but inside the liquid, downstream of the cavitator. Simultaneously, the lift of the hydrofoil decreases while its drag increases. 6.1 - Supercavity behind a two-dimensional NACA 16012 hydrofoil (REYNOLDS number 10 , cavitation parameter 0.07, angle of attack 17 deg.) For very high relative velocities between the liquid and the body, it is practically impossible to use non-cavitating foils, such as the conventional ones used in aero- dynamics. In such cases, different types of supercavitating foils have been designed for better efficiency, such as truncated foils with a base cavity or supercavitating foils with non-wetted uppersides. This chapter begins with a presentation of the main physical aspects of supercavities (§ 6.1). Although the background of applications was chosen rather on the side of two-dimensional, lifting bodies, most of the features are applicable to axisymmetric supercavities. After a section devoted to the basis of flow modeling (§ 6.2), some typical results are given in section 6.3. The case of axisymmetric supercavities is considered http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png

Fundamentals of CavitationSupercavitation

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
97 –130
DOI
10.1007/1-4020-2233-6_6
Publisher site
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Abstract

6. SUPERCAVITATION As the cavitation parameter is decreased, a small cavity attached to a hydrofoil will extend and grow longer and longer. It becomes a supercavity as soon as it ceases to close on the cavitator wall but inside the liquid, downstream of the cavitator. Simultaneously, the lift of the hydrofoil decreases while its drag increases. 6.1 - Supercavity behind a two-dimensional NACA 16012 hydrofoil (REYNOLDS number 10 , cavitation parameter 0.07, angle of attack 17 deg.) For very high relative velocities between the liquid and the body, it is practically impossible to use non-cavitating foils, such as the conventional ones used in aero- dynamics. In such cases, different types of supercavitating foils have been designed for better efficiency, such as truncated foils with a base cavity or supercavitating foils with non-wetted uppersides. This chapter begins with a presentation of the main physical aspects of supercavities (§ 6.1). Although the background of applications was chosen rather on the side of two-dimensional, lifting bodies, most of the features are applicable to axisymmetric supercavities. After a section devoted to the basis of flow modeling (§ 6.2), some typical results are given in section 6.3. The case of axisymmetric supercavities is considered

Published: Jan 1, 2005

Keywords: Stagnation Point; Lift Coefficient; Cavity Flow; Cavity Pressure; Cavity Closure

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