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TECHNICAL PAPERS

Transcritical Patterns of Cavitating Flow and Trends of Acoustic Level

[+] Author and Article Information
Wei Gu

Institute of High Performance Computing, National University of Singapore, Kent Ridge Crescent, Singapore 119260

Yousheng He

Department of Engineering Mechanics, Shanghai Jiao Tong University

Tianqun Hu

Shanghai Ship and Shipping Research Institute

J. Fluids Eng 123(4), 850-856 (Jun 06, 2001) (7 pages) doi:10.1115/1.1412233 History: Received August 12, 1999; Revised June 06, 2001
Copyright © 2001 by ASME
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References

Figures

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Models mounted in the water tunnel. (1—Plexiglass box; 2—hydrophone; 3—hydrofoil; 4—headform). (a) Hydrofoil; (b) axisymmetric bodies.
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Cavitation patterns on axisymmetric headforms. Left column: hemispherical headform. From top to bottom (σ=0.35,0.27,0.24,0.21),U=8m/s; Right column: 45-degree conical headform; From top to bottom (σ=0.37,0.33,0.24,0.21),U=8m/s.
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Trend of partial acoustic level for the cavitation flow on the hemispherical headform
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Trend of partial acoustic level for the cavitation flow on the 45-degree conical headform
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Noise spectrum in low frequency on the 2-degree a.o.a. NACA16012 hydrofoil (U=8m/s and σ=0.33)
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Trend of partial acoustic level for the cavitation flow on the 2-degree a.o.a. NACA16012 Hydrofoil
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Pattern of cloud cavitation shedding on the NACA16012 hydrofoil at 2-degree a.o.a. (a) Side view (cinegraphic result); (b) vertical view
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Noise spectrum in low frequency on the 5-degree a.o.a. NACA16012 hydrofoil (U=8m/s). (a) σ=0.60; (b) σ=0.85.
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Trend of partial acoustic level for the cavitation flow on the 5-degree a.o.a. NACA16012 Hydrofoil
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Frequency of cavity oscillation at 5-degree a.o.a.
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Frequency of cavity oscillation at 8-degree a.o.a.
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Strouhal number of cavity oscillation versus cavitation number at 5-degree a.o.a.
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Strouhal number of cavity oscillation versus cavitation number at 8-degree a.o.a.
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Typical stages of periodic cloud cavitation shedding on NACA16012 hydrofoil. (a) 5-degree a.o.a. U=7m/s,σ=0.45; (b) 8-degree a.o.a. U=7m/s,σ=1.29.

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