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TECHNICAL PAPERS

Numerical Analysis of Cavitation Instabilities Arising in the Three-Blade Cascade

[+] Author and Article Information
Yuka Iga

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

Motohiko Nohml

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

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 126(3), 419-429 (Jul 12, 2004) (11 pages) doi:10.1115/1.1760539 History: Received May 02, 2003; Revised February 09, 2004; Online July 12, 2004
Copyright © 2004 by ASME
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References

Figures

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Time evolution of void fraction contours around three blades (Time Interval=2.5 ms,ϕ=0.105,ψ=0.176,σ=0.146)
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Time evolution of pressure distribution contours around three blades (Time Interval=2.5 ms,ϕ=0.105,ψ=0.176,σ=0.146)
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Time evolution of lift coefficients of three blades, local pressures at the center of front cascade throat, local pressures of rear throat, local flow angles near the leading edge, local mass flow rate between blade to blade, velocity and pressure in inlet boundary, and total cavity volume, respectively from top to bottom
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Schematic aspect in super-synchronous forward rotating cavitation
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Concept of physical modeling of the locally homogeneous model
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Speed of sound under isothermal condition
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Schematic diagram of present flat plate cascade with three blades cyclic condition
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Time averaged static pressure coefficient versus cavitation number (present three blades cyclic cascade; h/c=0.5,γ=75 deg)
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Time averaged static pressure coefficient versus flow coefficient (present three blades cyclic cascade; h/c=0.5,γ=75 deg)
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Time evolution of void fraction contours around three blades (ϕ=0.213,ψ=0.131,σ=0.091)
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Classification of cavitation instabilities under propagation velocity ratio of nonuniform cavity area
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Time evolution of void fraction contours around three blades (ϕ=0.141,ψ=0.147,σ=0.103)
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Time evolution of void fraction contours around three blades (ϕ=0.141,ψ=0.110,σ=0.059)
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Schematic time evolution of local flow angle near the leading edge in super-synchronous forward rotating cavitation

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