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.
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