Spectral Characteristics of Sheet/Cloud Cavitation-Reference-Cited by-同舟云学术

Spectral Characteristics of Sheet/Cloud Cavitation

Published:2000-03-09 Issue:3 Volume:122 Page:481-487
ISSN:0098-2202
Container-title:Journal of Fluids Engineering
language:en
Short-container-title:

Author:

Kjeldsen Morten¹,Arndt Roger E. A.²,Effertz Mark²

Affiliation:

1. Norwegian University of Science and Technology (NTNU), Dept. of Thermal Energy and Hydropower, Alfred Getz v.4, N7034 Trondheim, Norway

2. St. Anthony Falls Laboratory, University of Minnesota, Mississippi River at 3rd Avenue S.E., Minneapolis, MN 55414

Abstract

Cavitation observations were made using a highly instrumented 2D NACA 0015 hydrofoil mounted in a specially designed water tunnel. It was found that the dynamic characteristics of the cavitation vary considerably with various combinations of angle of attack and cavitation number, σ. At higher angles of attack, two types of flow unsteadiness are observed. At low σ, a low frequency shedding of cloud cavitation results in a strong oscillation in lift and Δp at a Strouhal number, based on chord length, fc/U, of about 0.15. This frequency is relatively insensitive to changes in σ. As σ is raised, the harmonic content of the oscillations changes significantly. A spectral peak at much higher frequency is noted that increases in frequency almost linearly with cavitation number. Similar behavior is noted in the lift fluctuations. [S0098-2202(00)02503-7]

Publisher

ASME International

Subject

Mechanical Engineering

Link

http://asmedigitalcollection.asme.org/fluidsengineering/article-pdf/122/3/481/5900502/481_1.pdf

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