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TECHNICAL PAPERS

Numerical Study of Rotating Stall in a Pump Vaned Diffuser

[+] Author and Article Information
Takeshi Sano

Mitsubishi Heavy Industries, Ltd., Takasago Machinery Works, 2-1-1, Shinhama, Arai, Takasago, Hyogo 676-8686, Japan

Yoshiki Yoshida, Yoshinobu Tsujimoto

Osaka University, Graduate School of Engineering Science, 1-3, Machikaneyama, Toyonaka, Osaka 560-8531, Japan

Yuki Nakamura

Mitsubishi Heavy Industries, Ltd., Takasago Research & Development Center, 2-1-1, Shinhama, Arai, Takasago, Hyogo 676-8686, Japan

Tatsuhito Matsushima

Software Cradle Co., Ltd., 6-1-1, Nishinakajima, Yodogawa, Osaka, Osaka 532-0011, Japan

J. Fluids Eng 124(2), 363-370 (May 28, 2002) (8 pages) doi:10.1115/1.1459076 History: Received August 01, 2001; Revised January 04, 2002; Online May 28, 2002
Copyright © 2002 by ASME
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References

Hergt, P., and Starke, J., 1985, “Flow Patterns Causing Instabilities in the Performance Curves of Centrifugal Pumps with Vaned Diffusers,” Proceedings of the Second International Pump Symposium, pp. 67–75.
Eisele,  K., Zhang,  Z., Casey,  M. V., Gülich,  J., and Schachenmann,  A., 1997, “Flow Analysis in a Pump Diffuser-Part1: LDA and PTV Measurements of the Unsteady Flow,” ASME J. Fluids Eng., 119(4), pp. 968–977.
Shi,  F., and Tsukamoto,  H., 2001, “Numerical Study of Pressure Fluctuations Caused by Impeller-Diffuser Interaction in a Diffuser Pump Stage,” ASME J. Fluids Eng., 123(3), pp. 466–474.
Nohmi, M., and Goto, A., 1998, “Experimental and Computational Study of the Flow in a Vaned Return Channel of a Low Specific Speed Pump,” ASME, FEDSM98-4857.
Torbergsen, E. A., 1998, “Impeller/Diffuser Interaction forces in Centrifugal Pumps,” Doctor thesis, Norwegian University of Science and Technology.
Sano,  T., Nakamura,  Y., Yoshida,  Y., and Tsujimoto,  Y., 2000, “Alternate Blade Stall and Rotating Stall in Vaned Diffuser-Part1: Effects of Impeller/Diffuser Clearance,” (in Japanese), Trans. Jpn. Soc. Mech. Eng., Ser. B, 66B(650), pp. 2545–2552.
Jaworiski,  Z., Wyszynski,  M. L., and Nienow,  A. W., 1997, “Sliding Mesh Computational Fluid Dynamics-A Predictive Tool in Stirred Tank Design,” Proc. Inst. Mech. Eng., 211, Part E, pp. 149–156.
Yoshida, Y., Murakami, Y., Tsurusaki, H., and Tsujimoto, Y., 1991, “Rotating Stalls in Centrifugal Impeller/Vaned Diffuser Systems,” ASME, FED-Vol. 107, pp. 125–130.
Hergt, P., and Benner, R., 1968, “Visuelle Untersuchung der Strömung im Leitrad einer Radialpumpe,” Schweizerische Bauzeitung, 86. Jahrgang Helt 40, pp. 716–722.
Sinha,  M., Pinarbashi,  A., and Katz,  J., 2001, “The Flow Structure During Onset and Developed States of Rotating Stall Within a Vaned Diffuser of a Centrifugal Pump,” ASME J. Fluids Eng., 123(3), pp. 490–499.

Figures

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Calculation model. Eight black dots, No. 1–8, show the locations of pressure reference points at diffuser inlet (p3). (a) Model A, A1, and A2; (b) Model B; (c) magnification of the computational grid around the diffuser inlet
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Diffuser pressure performances for each channel. Upper figures show the results of periodic calculation (Model A1, and A2). Lower figures show those of Model A with Model A1 for comparison. (a) D3/D2=1.10; (b) D3/D2=1.27
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Flow field under the asymmetric stall condition (Model A, D3/D2=1.10,tan β/tan β3=0.3). Flow pattern is different between Channel 1 and Channel 2. (a) Velocity vector; (b) Pressure contour
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Propagation speed and temporal wave form of the pressure fluctuation caused by forward/backward rotating stall at several flow rates (Condition a to e) shown in Fig. 2(b), for D3/D2=1.27 (Model A). (a) Propagation speed vp/vσ2; (b) forward rotating stall for tan β/tan β3=0.18 (condition b); (c) backward rotating stall for tan β/tan β3=0.35 (condition e)
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Pressure performance and propagation speed ratio of rotating stalls (Model B). Diffuser pressure performance of Model A1 is shown for comparison. (a) D3/D2=1.10; (b) D3/D2=1.27
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Pressure fluctuations at the diffuser inlet, absolute velocity vector, and pressure contour around Channel 1 and 2 under the rotating stall obtained by the CFD simulation (D3/D2=1.10,ϕ=0.03,Ωp/Ω=0.10,N=2). (a) Pressure fluctuations in Channel 1 and 2; (b) cross spectrum of the pressure fluctuations between Channel 1 and 2; (c) cross phase delay of the pressure fluctuations between Channel 1 and 2; (d) absolute velocity vector; (e) pressure contour
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Pressure fluctuations at the diffuser inlet, and instantaneous pictures around Channel 1 and 2 under the rotating stall obtained by the experiment (D3/D2=1.10,ϕ=0.03,Ωp/Ω=0.08,N=3), uncertainty in ϕ±0.003, in Ωp/Ω±0.002, in Δψ±0.002, in phase delay ±3 degrees. (a) Pressure fluctuations in Channel 1 and 2; (b) cross spectrum of the pressure fluctuations between Channel 1 and 2; (c) cross phase delay of the pressure fluctuations between Channel 1 and 2; (d) reverse flow at the diffuser outlet; (e) jet flow in the channel

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