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TECHNICAL PAPERS

Spectral Characteristics of Sheet/Cloud Cavitation

[+] Author and Article Information
Morten Kjeldsen

Norwegian University of Science and Technology (NTNU), Dept. of Thermal Energy and Hydropower, Alfred Getz v.4, N7034 Trondheim, Norwaye-mail: Morten.Kjeldsen@tev.ntnu.no

Roger E. A. Arndt, Mark Effertz

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

J. Fluids Eng 122(3), 481-487 (Mar 09, 2000) (7 pages) doi:10.1115/1.1287854 History: Received June 15, 1999; Revised March 09, 2000
Copyright © 2000 by ASME
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References

Figures

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View of instrumented foil (left) and mounting plug with transducer positions shown (right)
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Comparison of measured and theoretical pressure distribution on a NACA 0015 foil
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Mapping of cavitation regimes. The lines l/c=constant are obtained from a linear fit to the cavity length data in Fig. 5.
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JFTA of suction side pressure transducer at 7 degrees angle of attack. The intensity of the color denotes the amplitude. St≡fc/U.
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Composite plot of type I peak frequency obtained at various angles of attack
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Average and dynamic characteristics of lift and pressure difference have been found to correlate well with each other. The abscissa of the power spectra is in Strouhal number, fc/U.
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Mean velocity comparison with and without cavitation. y=0 is taken to be that of maximum velocity deficit for the noncavitating case. (a) Measured data. (b) Numerical simulations of Song and He.
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Comparison of lift dynamics with the FFT of data rate in a cavitating flow. The fundamental frequency corresponds to a Strouhal number, fc/U=0.15.
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Numerical simulations of cavitating flow. Shown is the variation over one cycle of oscillation. Shading denotes vorticity, with dark black being positive.

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