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TECHNICAL PAPERS

Suppression of Unstable Flow at Small Flow Rates in a Centrifugal Blower by Controlling Tip Leakage Flow and Reverse Flow

[+] Author and Article Information
Mashiro Ishida, Taufan Surana, Hironobu Ueki, Daisaku Sakaguchi

Department of Mechanical Systems Engineering, Graduate School of Science and Technology, Nagasaki University, Nagasaki 852-8521, Japan

J. Turbomach 127(1), 76-83 (Feb 09, 2005) (8 pages) doi:10.1115/1.1811092 History: Received October 01, 2003; Revised March 01, 2004; Online February 09, 2005
Copyright © 2005 by ASME
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References

Figures

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Effect of through-flow rate on reverse flow zone in STD casing with be=10 [mm]
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Effect of diffuser width on pressure rise in vaneless diffuser at the design flow rate of ϕd=0.360
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Effect of diffuser width on hub-to-shroud velocity distribution at R=1.20; the design flow rate of ϕd=0.360
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Computational grid for test blower; SG*=0.21 groove with be=10 [mm] (R>1.2)
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Experimental characteristics of test blower; Comparison between STD casing with be=15 [mm], STD casing with be=10 [mm], and SG*=0.21 groove with be=10 [mm]
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Effect of through-flow rate on inlet recirculation flow and reverse flow; SG*=0.21 groove with be=10 [mm]
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Comparison of hub-to-shroud distribution of flow incidence (S*=0)
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Meridional section of test blower with SG*=0.21 groove and be=15 or 10 [mm]
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Computational grid for test blower; STD casing with be=15 [mm]
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Computational grid for test blower; SG*=0.21 groove with be=15 [mm]
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Variation of ring groove location: (a) SG*=0.31;s=19.2 [mm], (b) SG*=0.21;s=12.8 [mm], and (c) SG*=0.13;s=7.8 [mm]
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Effect of ring-groove location on inlet recirculation flow zone in the ring-groove arrangement and reverse flow zones in the midpitch plane of impeller passage and vaneless diffuser: (a) ϕ=0.360 and (b) ϕ=0.250
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Numerical results of impeller characteristics ψS2 and inlet recirculation flow rate ϕIR
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Experimental characteristics of test blower; comparison between STD casing and SG*=0.21 groove
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Frequency power spectrum of wall static pressure at S*=0.49 (R=0.74); comparison between STD casing and SG*=0.21 groove
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Effect of through-flow rate on reverse flow zone and inlet recirculation flow zone: (a) STD casing and (b) SG*=0.21 groove
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Contour lines of reverse flow zone on the surface of revolution of the midtip clearance space; case of impeller without inlet recirculation: (a) ϕ=0.300, (b) ϕ=0.250, and (c) ϕ=0.205
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Reverse flow zone in the impeller passage section of S*=0.395 downstream of inducer tip throat; Case of STD casing with be=15 [mm]: (a) ϕ=0.300, (b) ϕ=0.250, and (c) ϕ=0.205
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Effect of suction ring groove on tip leakage flow streak lines (ϕ=0.300). (a) Without ring groove and (b) With ring groove.
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Computational grid for test blower; STD casing with be=10 [mm] (R>1.2)
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Characteristics of test blower; comparison between be=15 and 10 [mm] in STD casing

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