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ADDITIONAL TECHNICAL PAPERS

Effect of Swirl on Rotordynamic Forces Caused by Front Shroud Pump Leakage

[+] Author and Article Information
Yun Hsu, Christopher E. Brennen

California Institute of Technology, Mail Code 104-44, Pasadena, CA 91125

J. Fluids Eng 124(4), 1005-1010 (Dec 04, 2002) (6 pages) doi:10.1115/1.1511164 History: Received August 17, 2001; Revised May 06, 2002; Online December 04, 2002
Copyright © 2002 by ASME
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References

Figures

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Schematic of the fluid-induced forces acting on an impeller whirling in a circular orbit
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Typical nondimensional data for Fn and Ft from the current experiments as functions of the whirl frequency ratio Ω/ω (data for contoured rotor with inlet swirl at ϕ=0.043)
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Schematic of the experimental facility showing the rotor and stator assembly (left), the α=6 deg inlet guide vanes (right) and the location of the Pitot tubes
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Comparison of the experimental measurements (×) of the pressure coefficient (Cp) profiles in the leakage path for ϕ=0.043, 0.054, and 0.065 with the calculated profiles for inlet swirl ratios of 0, 0.27, 0.4, and 0.5
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Experimental inlet swirl ratio versus flow coefficient ϕ, with 6-deg inlet swirl vanes at 500 rpm(⋄ ), 1000 rpm(□ ), with 2-deg swirl vanes at 500 rpm(▵ ), 1000 rpm(○ ), and with radial vanes at 1400 rpm(× ) and 1000 rpm(* )
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Experimental rotordynamic coefficients for the contoured rotor plotted against flow coefficient, ϕ, for tests with inlet swirl, Γ=0.0(▵), 0.4 (+), 0.5 (×), 0.6 (○) and 0.7 (*) (presented by Uy and Brennen 6 and here shown to be inaccurate)
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Experimental rotordynamic coefficients for the contoured rotor plotted against flow coefficient, ϕ, for tests with inlet swirl, Γ=0.0,(○) and 0.26 (×)
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Experimental rotordynamic coefficients plotted against flow coefficient ϕ for tests with inlet swirl with the contoured rotor (□,Γ=0.27) and the conical rotor (×,Γ=0.27)
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Swirl reduction devices
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Rotordynamic coefficients plotted against flow coefficient for experiments with inlet swirl: no antiswirl devices (×), four full-length antiswirl ribs (○), four full-length antiswirl grooves (+).

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