In order to study the impellervolute interaction in a doubleblade centrifugal pump, the flow in three sections of impeller passages was measured with nine different locations between a blade and the tongue of volute at the best efficiency point. The relative velocity field and axial velocity field are greatly dependent on the distance between a blade and the tongue. When a blade is between the tongue and the section 1 on volute, the flow rate in that passage is the lowest, and the relative velocity field is uniform. Meanwhile, there is a low velocity zone in the corner between the shroud and the blade suction side at the passage outlet, causing a jetwake flow pattern at the impeller outlet. A higher axial velocity range is observed at the passage inlet. As the blade leaves far away from the tongue due to its rotation, the flow rate in the passage is increased, and flow is separated from the blade pressure side, establishing a vortex there. The relative velocity profile at the passage outlet becomes uniform, and the axial velocity at the passage inlet decreases as well. As the blade gets close to the tongue, the flow rate in the passage is reduced, and the scale of the vortex is decreased and disappears eventually. The relative velocity at the blade pressure side outlet is lowered, but that at the blade suction side is increased, meanwhile the axial velocity at the passage inlet continues decreasing.
LIU Hou-Lin,YANG Dong-Sheng,TAN Ming-Gao et al. 3D PIV measurements of rotorstator interactions in doubleblade centrifugal pump[J]. Journal of Drainage and Irrigation Machinery Engin, 2012, 30(4): 384-389.
Tian Hui,Guo Tao,Sun Xiuling,et al.Numerical simulation of unsteady flow in a centrifugal pump[J].Transactions of the Chinese Society for Agricultural Machinery,2009,40(8):92-95.(in Chinese)
Raúl Barrio,Jorge Parrondo,Eduardo Blanco.Numerical analysis of the unsteady flow in the neartongue region in a volutetype centrifugal pump for different operating points[J].Computers Fluids,2010,39:859-870.
Carlos S M.Numerical modelling and flow analysis of a centrifugal pump running as a turbine:Unsteady flow structures and its effects on the global performance[J].International Journal for Numerical Methods in Fluids,2011,65: 542-562.
Jesús M F,José G,Katia M,et al.Decomposition of deterministic unsteadiness in a centrifugal turbomachine:Nonlinear interactions between the impeller flow and volute for a double suction pump[J].Journal of Fluids Engineering,2011,133(1):1-10.
Pei Ji,Yuan Shouqi,Yuan Jianping.Numerical calculation for effect of fluidstructure interaction on flow field in centrifugal pump[J].Transactions of the Chinese Society for Agricultural Machinery,2009,40(12):107-112.(in Chinese)
Guo Pengcheng,Luo Xingqi,Liu Shengzhu.Numerical simulation of 3D turbulent flow fields through a centrifugal pump including impeller and volute casing[J].Transactions of the CSAE,2005,21(8):1-5.(in Chinese)
Huan Yueqing,Shao Chunlei,Huang Xinglu,et al.3D numerical simulation on internal flow field in medium specific speed centrifugal pump[J].Journal of Nanjing University of Technology:Natural Science Edition,2010,32(2):42-45.(in Chinese)
Zhao Binjuan,Yuan Shouqi,Liu Houlin,et al.Numerical simulation and particle image velocimeter measurement for unsteady turbulent flow in doublechannel pump[J].Journal of Mechanical Engineering,2009,45(9):82-88.(in Chinese)
Pedersen N,Larsen P S,Jacobsen C B.Flow in a centrifugal pump impeller at design and offdesign conditions—Part I:Particle image velocimetry(PIV) and laser doppler velocimetry(LDV) measurements[J].Journal of Fluids Engineering,2003,125(1):61-72.
Krause N,Zahringer K,Pap E.Timeresolved particle imaging velocimetry for the investigation of rotating stall in a radial pump[J].Experiments in Fluids,2005,39(2):192-201.
Feng J,Benra F K, Dohmen H J.Unsteady flow visualization at partload conditions of a radial diffuser pump:By PIV and CFD[J].Journal of Visualization,2009,12(1):65-72.
Westra R W,Broersma L,Andel K,et al.PIV measurements and CFD computations of secondary flow in a centrifugal pump impeller[J].Journal of Fluids Engineering,2010,132(6):1-8.