Overview of rotating stall in centrifugal pumps with vaned diffuser
Yang Jun, Yuan Shouqi, Pei Ji, Zhang Jinfeng
1.School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093 China;2.National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China
Abstract:Rotating stall phenomenon in centrifuge pumps with vaned diffuser restricts significantly their own operational safety and stability. The rotating stall can be classified into two groups according its propagation direction, namely the forward rotating stall and backward rotating stall. Normally, the forward rotating stall occurs easily in the inlet of impeller at part-load, but the backward rotating stall happens in the diffuser channels near design condition. Both types of rotating stall can lead to a consi-derable influence on the pump performance curve. Presently, CFD or PIV or unsteady pressure mea-surement is commonly used to study the rotating stall in a centrifugal pump with vaned diffuser in China and abroad in a combined manner. The characteristic parameters of rotating stall including frequency, number of stall cells and propagating speed etc. are obtained by conducting analyses of fluid velocity and pressure fluctuation signals in frequency and time domains respectively. However, how a rotating stall cell to occur and develop etc. in the pump remains unanswered. Thus for these problems a throughout experimental and analytical investigation is desirable.
[1]Sinha M,Pinarbasi A,Katz J. The flow structure during onset and developed states of rotating stall within a vaned diffuser of a centrifugal pump[J].Journal of Flui-ds Engineering, 2001, 123(3):490-499.[2]Emmons H W, Pearson C E, Grant H P. Compressor surge and stall propagation[J]. Transactions of ASME, 1955, 77(3):455-469.[3]潘中永, 李俊杰, 李红, 等. 叶片泵旋转失速的研究进展[J]. 流体机械, 2011, 39(2):35-39. Pan Zhongyong, Li Junjie, Li Hong, et al. Overview for Research on rotating stall of pump[J]. Fluid Machinery,2011,39(2):35-39.(in Chinese)[4]Yoshida Y, Murakami Y, Tsurusaki H, et al. Rotating stalls in centrifugal impeller/vaned diffuser systems[C]//Proceedings of the ASME/JSME Joint Fluids Engineering, 1991:125-130.[5]张伟,余运超,陈红勋.离心泵叶轮非设计工况下内部湍流流场的数值模拟[J]. 排灌机械工程学报,2010, 28(1):38-42. Zhang Wei, Yu Yunchao, Chen Hongxun. Numerical simulation of flow in centrifugal pump impeller at off-design conditions[J]. Journal of Drainage and Irrigation Machinery Engineering, 2010, 28(1):38-42.(in Chinese)[6]Sano T, Nakamura Y, Yoshida Y, et al. Alternate blade stall and rotating stall in a vaned diffuser[J]. JSME International Journal Series B:Fluids and Thermal Engineering, 2002, 45(4):810-819.[7]Hergt P, Starke J. Flow patterns causing instabilities in the performance curves of centrifugal pumps with vaned diffusers[C]//Proceedings of the Second International Pump Symposium, 1985:67-75.[8]Sen M. Prerotation in centrifugal pumps[J]. Off-Design Performance of Pumps, 1978:1.[9]Murakami M, Heya N. Swirling flow in suction pipe of centrifugal pumps[J], Bulletin of JSME, 1966, 34(9):328-353.[10]Barrand J P, Caignaert G, Canavelis R, et al. Experimental determination of the reverse flow onset in a centrifugal impeller[C]//Proceedings of the First International Pump Symposium, 1984.[11]Lino M, Tanaka K, Miyagawa K, et al. Numerical simulation of hysteresis on head/discharge characteristics of a centrifugal pump[C]//Proceedings of the ASME/JSME 4th Joint Fluids Summer Engineering Conference, 2003: 1165-1172.[12]Gülich J F. Centrifugal Pumps[M]. Berlin: Springer, 2008:230-238.[13]Cavazzini G, Pavesi G, Ardizzon G. Validation of an analysis method for particle image velocimetry of turbulent unsteady flows in turbomachinery[J]. Journal of Power and Energy, 2010, 224(5):679-689.[14]Dazin A, Coutier-Delgosha O, Dupont P, et al. Rotating instability in the vaneless diffuser of a radial flow pump[J]. Journal of Thermal Science, 2008, 17(4):368-374.[15]Dazin A, Cavazzini G, Pavesi G, et al. High-speed stereoscopic PIV study of rotating instabilities in a radial vaneless diffuser[J]. Experiments in Fluids, 2011, 51(1):83-93.[16]Pavesi G, Dazin A, Cavazzini G, et al. Experimental and numerical investigation of unforced unsteadiness in a vaneless radial diffuser[C]//Proceedings of the 9th European Conference on Turbomachinery-fluid Dyna-mics and Thermodynamics, 2011:625-636.[17]Yang J, Pavesi G, Cavazzini G, et al. Numerical characterization of pressure instabilities in a vaned centrifugal pump under partload condition[C]//Proceedings of the IOP Conference Series: Materials Science and Engineering, 2013:022044.[18]Hasmatuchi V, Farhat M, Roth S, et al. Experimental evidence of rotating stall in a pump-turbine at off-design conditions in generating mode[J]. Journal of Fluids Engineering, 2011, 133(5):051104.[19]Berten S, Dupont P, Fabre L, et al. Experimental investigation of flow instabilities and rotating stall in a high-energy centrifugal pump stage[C]//Proceedings of the ASME 2009 Fluids Engineering Division Summer Meeting. USA:American Society of Mechanical Engineers, 2009: 505-513.[20]Pan Zhongyong, Wu Taotao, Li Junjie, et al. Mechanism of characteristic instability and its suppression in mixed flow pump [J]. International Journal of Comprehensive Engineering, 2012, 1:67-73.[21]Braun O. Part load flow in radial centrifugal pumps[D]. Lausanne: École Polytechnique Fédérale de Lausanne, 2009.[22]Cavazzini G, Dazin A, Pavesi G, et al. Post-processing methods of PIV instantaneous flow fields for unsteady flows in turbomachines[J]. The Particle Image Velocimetry-Characteristics, Limits and Possible Applications, 2012: 97-120.[23]Choi J S. Experiments on the unsteady flow field associated with noise generation in centrifugal turbomachinery[D]. The Pennsylvania: The Pennsylvania State University, 1991.[24]Bent P H. Experiments on the aerodynamic generation of noise in centrifugal turbomachinery[D]. The Pennsylvania: The Pennsylvania State University, 1993.