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TECHNICAL PAPERS

Suppression of Rotating Stall by Wall Roughness Control in Vaneless Diffusers of Centrifugal Blowers

[+] Author and Article Information
Masahiro Ishida, Daisaku Sakaguchi, Hironobu Ueki

Department of Mechanical Systems Engineering, Nagasaki University, Nagasaki 852-8521, Japan

J. Turbomach 123(1), 64-72 (Feb 01, 2000) (9 pages) doi:10.1115/1.1328084 History: Received February 01, 2000
Copyright © 2001 by ASME
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References

Fukushima,  Y., Nishida,  H., and Miura,  H., 1989, “Rotating Stall of Centrifugal Compressors,” Turbomachinery, 17, No. 3, pp 149–159 [in Japanese].
Abdelhamid, A. N., 1982, “Control of Self-excited Flow Oscillations in Vaneless Diffuser of Centrifugal Compressor System,” ASME Paper No. 82-GT-188.
Senoo, Y., Hayami, H., and Ueki, H., 1983, “Low-Solidity Tandem-Cascade Diffusers for Wide-Flow-Range Centrifugal Blowers,” ASME Paper No. 83-GT-3.
Harada,  H., 1996, “Non-Surge Centrifugal Compressor With Variable Angle DiffuserVanes,” Turbomachinery, 24, No. 10, pp. 600–608 [in Japanese].
Kurokawa, J., Matsui, J., Kitahora, T., and Saha, L., 1997, “A New Passive Device to Control Rotating Stall in Vaneless and Vaned Diffusers by Radial Grooves,” Proc. JSME Intl. Conf. on Fluid Engrg., II , pp. l109–1114.
Tsurusaki, H., and Kinoshita, T., 1999, “Flow Control of Rotating Stall in a Radial Vaneless Diffuser,” Proc. of 3rd ASME/JSME Joint Fluids Engrg. Conf., Paper No. FEDSM99-7199.
Jansen,  W., 1964, “Steady Fluid Flow in a Vaneless Diffuser,” ASME J. Basic Eng., 86, No. 3, pp. 607–619.
Senoo,  Y., Kinoshita,  Y., and Ishida,  M., 1977, “Asymmetric Flow in Vaneless Diffusers of Centrifugal Blowers,” ASME J. Fluids Eng., 99, pp. 104–114.
Ishida, M., Sakaguchi, D., Ueki, H., and Sun, Z., 1997, “Relationship Between Rotating Stall Inception and Three-Dimensional Flow Separation on Vaneless Diffuser Wails in Centrifugal Blowers,” Proc. JSME Intl. Conf. on Fluid Engrg., No. 97-203, II , pp. 1097–1102.
Kinoshita,  Y., and Senoo,  Y., 1985, “Rotating Stall Induced in Vaneless Diffusers of Very Low Specific Speed Centrifugal Blowers,” ASME J. Eng. Gas Turbines Power, 107, pp. 514–521.
Senoo,  Y., and Kinoshita,  Y., 1977, “Influence of Inlet Flow Conditions and Geometries of Centrifugal Vaneless Diffusers on Critical Flow Angle for Reverse Flow,” ASME J. Fluids Eng., 99, 98–103.
Ishida, M., Ueki, H., Sakaguchi, D., and Surana, T., 1993, “Unstable Flow Measurement in a Centrifugal Blower by SemiconductorLaser 2-Focus Velocimeter,” Proc. 4th Asian Intl. Conf. on Fluid Machinery, 1 , pp. 77–82
Ishida,  M., and Sakaguchi,  D., 1997, “Behavior of Separation Ring on Shroud Casing Wall of a Centrifugal Blower (Visualization of Separation Ring by Oil Film Technique),” J. Visualization Society Japan, 17–64, pp. 46–50 [in Japanese].
Wiesner,  F. J., 1967, “A Review of Slip Factors for Centrifugal Impellers,” ASME J. Eng. Power, 89, pp. 558–572.
Senoo,  Y., and Ishida,  M., 1975, “Behavior of Severely Asymmetric Flow in a Vaneless Diffuser,” ASME J. Eng. Power, 97, No. 3, pp. 375–387.
Senoo, Y., Ishida, M., and Ono, M., 1973, “Pressure Loss of Asymmetric Flow in the Vaneless Diffuser of a Centrifugal Blower,” Reports of Institute of Industrial Sciences, Kyushu University, No. 58, pp. 25–34 [in Japanese].

Figures

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Meridional section of test blower and impeller
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Change in impeller characteristics due to tip clearance
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Measured hub-to-shroud velocity distribution in vaneless diffuser (ϕ=0.131, λ=0.147): (a) radial component; (b) tangential component
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Velocity component profiles in three-dimensional boundary layer
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Calculated radial velocity contour in vaneless diffuser under asymmetric inlet main-flow condition (ϕ=0.15, λ=0.029, ΔVu/Vum=±0.02, ΔVm/Vmm=0)
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Comparison of calculated wall-limiting streamline flow angles between symmetric and asymmetric main-flows (ϕ=0.15, λ=0.29, ΔVu/Vum=±0.02, ΔVm/Vmm=0 for asymmetric main-flow)
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Effect of wall friction on three-dimensional separation and diffuser pressure recovery (ϕ=0.15, λ=0.029, ΔVu/Vum=±0.02,ΔVm/Vmm=0): (a) change in wall-limiting streamline flow angle at hub side; (b) change in diffuser pressure recovery
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Effect of locally rough wall on diffuser pressure recovery (ϕ=0.15, λ=0.029, ΔVu/Vum=±0.02,ΔVm/Vmm=0)
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Effect of locally rough wall on velocity and flow angle at hub side in case with three-dimensional boundary layer separation (ϕ=0.15, λ=0.029, ΔVu/Vum=±0.02,ΔVm/Vmm=0): (a) tangential and radial components of velocity; (b) flow angles of main-flow and wall-limiting streamline
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Schematic relation between polar diagram of velocity vector and wall shear stress vector in case with three-dimensional separation
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Calibrated friction coefficient of “G40” sandpaper
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Rough wall position on the vaneless diffuser wall
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Change in blower characteristics due to wall roughness control (λ=0.147)
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Comparison of measured and calculated velocity distributions between smooth and rough walls (ϕ=0.131, λ=0.147, R=1.57, ΔVu/Vum=±0.02, ΔVm/Vmm=0 for calculation): (a) measured result; (b) calculated result
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Comparison of measured turbulence intensity distribution between smooth and rough walls (ϕ=0.131, λ=0.147, R=1.57)
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Comparison of diffuser pressure recovery between the cases with and without rough wall at design flow rate (ϕ=0.27, λ=0.147, ΔVu/Vum=±0.02, ΔVm/Vmm=0 for calculation)
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Effect of locally rough wall on velocity and flow angle at hub side in case without three-dimensional boundary layer separation (ϕ=0.27, λ=0.147, ΔVu/Vum=±0.02,ΔVm/Vmm=0): (a) tangential and radial components of velocity; (b) flow angles of main-flow and wall-limiting streamline

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