A Cavity Wake Model Based on the Viscous/Inviscid Interaction Approach and Its Application to Nonsymmetric Cavity Flows in Inducers

[+] Author and Article Information
Yury Semenov, Yoshinobu Tsujimoto

Osaka University, Engineering Science, 1-3 Machikaneyama, Toyonaka 560-8581, Osaka, Japan

J. Fluids Eng 125(5), 758-766 (Oct 07, 2003) (9 pages) doi:10.1115/1.1598990 History: Received May 21, 2002; Revised March 15, 2003; Online October 07, 2003
Copyright © 2003 by ASME
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Asymmetric cavity flow in the two-blade cascade: blade angle 10 deg, angle of attack 5 deg, solidity 2.5 for cavitation numbers 0.095 and 0.145
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Predicted head coefficient compared with experiment, plotted versus the relative to the choked cavitation number σ*, for inducer No. 5; A.B.C. alternate blade cavitation; R.C. rotating cavitation
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Predicted cavity length, length of the mixing region and flow rate in the blade channels versus cavitation number for the three-blade cascade: blade angle 10 deg, flow coefficient 0.113, solidity 2.5
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(a) Experimental suction performances and map showing the occurrence regions of various oscillating cavitation types for inducer No. 4 (see Appendix B); (b) predicted suction performances and map of regions of the nonsymmetric flow for inducer No. 4 (see Appendix B)
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Comparison of the regions of nonsymmetric flow past two and three-blades cascade in the plane of the cascade solidity and the parameter σtip/(2α): the blade angle β=8 deg, flow coefficient ϕ=0.084; A.B.C. alternate blade cavitation, two(four)-bladed inducers; A.U.C. attached uneven cavitation, three-bladed inducers  
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(a) Model of the cavity flow with viscous wake; (b) parameter domain
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Procedure of coupling the viscous and inviscid flow
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Effect of choice of the coefficient χ on the cavity length, length of separated region, and static head coefficient for the flow parameters: blade angle β=10 deg, angle of attack α=5 deg, solidity of the cascade τ=3
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Suction performance of the inducers compared with experiment
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Boundaries of the inviscid flow at the tip, middle and hub radius for the inducer No. 1
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Cavitation compliance prediction compared with experimental data for Inducer No. 1, 27, and experimental range of cavitation compliance for Saturn boosters engines J2 and F1, 28
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Head dependences of the cascade versus cavity length for various flow rates in the case of symmetric cavity flow (solid lines) and alternate blade cavitation (closed squares for longer cavities and closed triangles for shorter cavities): blade angle 10 deg, solidity 2.5




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