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                                  Study on generating mechanism of pressure fluctuation
                                        in the vaneless region of the pump-turbine

                                    XU Hongquan,LU Li,WANG Wanpeng,ZHAO Lice
                               (China Institute of Water Resources and Hydropower Research, Beijing  100038,China)

                   Abstract: The powerhouse vibration of pumped storage power station is a critical technical challenge,
                   which influences the safe and stable operation of powerhouse and grids. This paper first describes the ampli⁃
                   tude and frequency characteristics of pressure fluctuation in the vaneless region of pump-turbine, drawing
                   conclusions that the amplitude of pressure fluctuation in the vaneless region is higher than other regions,
                   the amplitude of pressure fluctuation in the vaneless region under turbine mode is higher than that under
                   pump mode and the amplitude of pump-turbine under turbine mode is higher than that of normal Francis
                   turbine. It states that the main frequency of pressure fluctuation in the vaneless region is blade passing fre⁃
                   quency. Secondly, by using the theory of free vortex, the paper presents the cognition that high amplitude
                   pressure fluctuation in the vaneless region of pump-turbine under turbine mode originates from free vortex
                   separating from front inlet edge of the runner blades based on the in-depth analysis on turbine optimum
                   condition of pump-turbine away from operating area, inlet velocity triangle of runner blades under turbine
                   mode and the amplitudes of pressure fluctuation reaching maximum under runaway speed condition.
                   Keywords:pumped storage power station;pump-turbine;vaneless region;pressure fluctuation;flow separa⁃
                   tion;free vortex;blade passing frequency

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