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TECHNICAL PAPERS

Numerical Study of Sheet Cavitation Breakoff Phenomenon on a Cascade Hydrofoil

[+] Author and Article Information
Yuka Iga

Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai Miyagi 980-8577, Japane-mail: iga@.ifs.tohoku.ac.jp

Motohiko Nohmi

Ebara Research Co., Ltd., 11-1, Haneda Asahi-cho, Ohta-ku, Tokyo 144-8510, Japane-mail: nohmi@ebara.co.jp

Akira Goto

Ebara Research Co., Ltd., 4-2-1, Honfujisawa, Fujisawa 251-8502, Japane-mail: goto05296@erc.ebara.co.jp

Byeong Rog Shin

Toshiaki Ikohagi

Institute of Fluid Science, Tohoku University, 2-1-1, Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japane-mail: ikohagi@ifs.tohoku.ac.jp

J. Fluids Eng 125(4), 643-651 (Aug 27, 2003) (9 pages) doi:10.1115/1.1596239 History: Received September 28, 2001; Revised March 18, 2003; Online August 27, 2003
Copyright © 2003 by ASME
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References

Figures

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Time evolution of void fraction contours around flat-plate cascade hydrofoils (t/c=0.5, γ=75 deg, σ/2αi=1.27, time interval=2.0 ms)
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Time evolution of pressure distribution on suction side of flat-plate cascade hydrofoils (t/c=0.5, γ=75 deg, σ/2αi=1.27, time interval=2.0 ms)
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Time evolutions of pressure waves inside cavity and cavity length (t/c=0.5, γ=75 deg, σ/2αi=1.27)
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Power spectrum of pressure at cascade throat center (t/c=0.5, γ=75 deg, σ/2αi=1.27)
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Instantaneous void fraction contours around flat-plate cascade hydrofoils (t/c=0.5, γ=75 deg, σ/2αi=0.23)
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Strouhal number of cavity shedding on flat-plate cascade hydrofoil
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Concept of the locally homogeneous model
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Speed of sound under isothermal condition of T=293.16 K
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Computational grid around cascade hydrofoils (Clark Y 11.7%, t/c=0.9, γ=30 deg)
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Time-averaged lift and drag coefficients of a single hydrofoil at several cavitation numbers (Clark Y 11.7%)
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Time-averaged lift and drag coefficients of a cascade of hydrofoils (Clark Y 11.7%, noncavitating state)
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Time-averaged pressure distribution of cascade hydrofoils (Clark Y 11.7%, noncavitating state)
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Time evolutions of void fraction contours (left), mass flux vectors (center), and pressure distributions (right) around flat-plate cascade hydrofoils (t/c=0.9, γ=30 deg, σ/2αi=1.95, time interval=1.2 ms)
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Time evolutions of cavity lengths, re-entrant jet and lift coefficient (t/c=0.9, γ=30 deg, σ/2αi=1.95)
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Power spectrum of pressure at cascade throat center (t/c=0.9, γ=30 deg, σ/2αi=1.95)
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Instantaneous void fraction contours around flat-plate cascade hydrofoils (t/c=0.5, γ=75 deg, σ/2αi=1.27)

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