The effects of the inlet recirculation arrangement on inducer stall and the diffuser width on diffuser stall in a high-specific-speed-type centrifugal impeller with inducer were analyzed by numerical simulation and also verified experimentally. It was found that the incipient unstable flow occurs due to a rolling-up vortex flow, resulting from an interaction between the tip leakage flow and the reverse flow accumulated at the pressure side immediately downstream of the inducer tip throat, in which a strong streamwise component of vorticity is included. By forming the inlet recirculation flow, the tip leakage vortex is effectively sucked into the suction ring groove, and the flow incidence is decreased simultaneously. The unstable flow range of the test blower was reduced significantly by about 45% without deteriorating the impeller characteristics by implementing optimally both the ring groove arrangement and the narrowed diffuser width.
Issue Section:
Technical Papers
1.
Ishida, M., Sakaguchi, D., Ueki, H., and Sun, Z., 1997, “Relationship Between Rotating Stall Inception and 3-D Flow Separation on Vaneless Diffuser Walls in Centrifugal Blowers,” Proc. of JSME International Conference on Fluid Engineering, JSME, Toyko, Paper No. 97-203, Vol. II, pp. 1097–1102.
2.
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
, 117
(64
), pp. 46
–50
(in Japanese).3.
Ueki
, H.
, Ishida
, M.
, Sakaguchi
, D.
, and Sun
, Z.
, 2000
, “Suppression of Inducer Stall Based on Inlet Recirculation in a Centrifugal Blower (1st Report, Improvement in Stall Limit by Ring Groove Arrangement)
,” Trans. Jpn. Soc. Mech. Eng., Ser. B
, 66
(647
), pp. 1706
–1711
(in Japanese).4.
Sun, Z., Ishida, M., Sakaguchi, D., and Ueki, H., 1998, “Flow Analysis and Surge Suppression in a Centrifugal Blower,” Proc. of 3rd International Conference on Pumps and Fans, Tsinghua University Press, Beijing, pp. 204–214.
5.
Ishida, M., Sun, Z., Sakaguchi, D., Ueki, H., and Masuzawa, C., 1999, “Numerical Analysis and Experimental Verification of Inlet Recirculation for Unstable Flow Suppression in a Centrifugal Blower,” Proc. of 3rd ASME/JSME Joint Fluid Engineering Symposium, Paper No. FEDSM99-6844.
6.
Sun
, Z.
, Ishida
, M.
, Sakaguchi
, D.
, and Ueki
, H.
, 2000
, “Suppression of Inducer Stall Based on Inlet Recirculation in a Centrifugal Blower (2nd Report, Numerical Analysis of Stall Suppression Effect)
,” Trans. Jpn. Soc. Mech. Eng., Ser. B
, 66
(647
), pp. 1712
–1718
; (in Japanese).7.
Fisher, F. B., 1988, “Application of Map Width Enhancement Devices to Turbocharger Compressor Stages,” SAE Paper No. 880794.
8.
Sun, Z., Ishida, M., and Masuzawa, C., 2000, “A Computational Study on Optimum Inducer Leading Geometry for Stall Suppression in a Centrifugal Blower,” ASME Paper No. FEDSM2000-11059.
9.
Ishida, M., Sun, Z., Taufan S., and Sakaguchi, D., 2002, “Numerical Investigation of Inducer Stall at Small Flow Rates in a Centrifugal Blower (Effect of Blade Leading Shape on Flow Separation),” Proc. of 4th International Conference on Pumps and Fans (4th ICPF), China Science and Technology Press, Beijing, pp. 206–212.
10.
Sun, Z., Taufan S., Ishida, M., and Ueki, H., 2002, “Numerical Simulation on Flow Separation Behavior in a Centrifugal Blower Under Time-Periodic Inflow Condition,” Proc. of 4th International Conference on Pumps and Fans (4th ICPF), China Science and Technology Press, Beijing, pp. 315–321.
11.
Taufan, S., Ishida, M., Ueki, H., and Sakaguchi, D., 2002, “Effect of Inducer Blade Leading Shape on Unstable Flow Inception in a Centrifugal Blower (Comparison of Numerical Analysis and Experiment),” Proc. (CD-ROM) of 5th JSME-KSME Fluids Engineering Conference, JSME, Tokyo, OS16-4, Paper No. 2, pp. 1–6.
12.
Furukawa
, M.
, Inoue
, M.
, Saiki
, K.
, and Yamada
, K.
, 1999
, “The Role of Tip Leakage Vortex Breakdown in Compressor Rotor Aerodynamics
,” ASME J. Turbomach.
, 121
(3
), pp. 469
–480
.13.
Furukawa, M., Saiki, K., Yamada, K., and Inoue, M., 2000, “Unsteady Flow Behavior Due to Breakdown of Tip Leakage Vortex in an Axial Compressor Rotor at Near-Stall Condition,” ASME Turbo Expo, Munich, Germany Paper No. 2000-GT-0666.
14.
Abdelhamid, A. N., 1982, “Control of Self-Excited Flow Oscillations in Vaneless Diffuser of Centrifugal Compressor System,” ASME Paper No. 82-GT-188.
15.
Fukushima
, Y.
, Nishida
, H.
, and Miura
, H.
, 1989
, “Rotating Stall of Centrifugal Compressors
,” Turbomach.
, 17
(3
), pp. 149
–159
(in Japanese).16.
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.
17.
Harada
, H.
, 1996
, “Non-Surge Centrifugal Compressor With Variable Angle Diffuser Vanes
,” Turbomach.
, 24
(10
), pp. 600
–608
(in Japanese).18.
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. of JSME Intl. Conf. on Fluid Engineering, Vol. II, JSME, Tokyo, Paper No. JSME ICFE-97-716, pp. 1109–1114.
19.
Tsurusaki, H., and Kinoshita, T., 1999, “Flow Control of Rotating Stall in a Radial Vaneless Diffuser,” Proc. of 3rd ASME/JSME Joint Fluids Engineering Conference, ASME, New York, Paper No. FEDSM99-7199, pp. 1–6.
1.
Ishida
, M.
, Sakaguchi
, D.
, and Ueki
, H.
, 2001
, “Suppression of Rotating Stall by Wall Roughness Control in Vaneless Diffusers of Centrifugal Blowers
,” ASME J. Turbomach.
, 123
(1
), pp. 64
–72
; 2.
also ASME Paper No. 2000-GT-0461.
1.
Nishizawa
, T.
, and Takata
, H.
, 1999
, “Numerical Study on Stall Flutter of A Compressor Cascade (1st Report, Numerical Method and Numerical Example)
,” Trans. Jpn. Soc. Mech. Eng., Ser. B
, 65
(635
), pp. 2293
–2300
(in Japanese); 2.
also ASME 94-GT-258.
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by ASME
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