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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

Avva, Ram K., Singhal, Ashok K., and Gibson, Dennis H., 1995, “An Enthalpy Base Model of Cavitation,” Cavitation and Gas-Liquid Flow in Fluid Machinery Devices, ASME, New York, FED-Vol. 226, pp. 63–70.
Deshpande,  M., Feng,  J., and Merkle,  C. L., 1994, “Cavity Flow Predictions Based on the Euler Equations,” ASME J. Fluids Eng., 116, pp. 36–44.
Kubota,  A., Kato,  H., and Yamaguti,  H., 1992, “A New Modelling of Cavitating Flows: A Numerical Study of Unsteady Cavitation on a Hydrofoil Section,” J. Fluid Mech., 240, pp. 59–96.
Reboud, J. L., and Delannoy, Y., 1994, “Two Phase Flow Modeling of Unsteady Cavitation,” Proc. 2nd Int. Symp. on Cavitation, Tokyo, Japan, pp. 39–44.
Shin, B. R., and Ikohagi, T., 1999, “Numerical Analysis of Unsteady Cavity Flows Around a Hydrofoil,” ASME Paper No. 99-7215.
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Hofmann, M., Lohrberg, H., Ludwig, G., Stoffel, B., Reboud, J.-L., and Fortes-Patella, R., 1999, “Numerical and Experimental Investigations on the Self-Oscillating Behavior of Cloud Cavitation,” ASME Paper Nos. 99-6755, 99-7259.
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Karplus, H. B., 1958, “The Velocity of Sound in a Liquid Containing Gas Bubbles,” Armour Research Foundation of Illinois Institute of Technology, Paper No. C00-248.
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Figures

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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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Strouhal number of cavity shedding on flat-plate cascade hydrofoil
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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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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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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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