Abstract
In order to study the characteristics of pressure distribution and the influence of compressibility factors on pressure fluctuation of pump turbine under the condition of turbine. Based on RNG k-ԑ model, aiming at a pump turbine model, this paper uses UG NX10.0 software to build a three-dimensional model, and uses ICEM-CFD software to devide the mesh. Using ANSYS-CFX software, the unsteady simulation calculation of the whole flow passage under the opening of 10 mm movable guide vane is carried out, and the frequency spectrum of pressure fluctuation is obtained by using the fast Fourier transform. After analysis, the dynamic and static interference between the movable guide vane and the runner, as well as between the runner and the draft tube, has an impact on the pressure fluctuation in the front of the runner behind the guide vane and in the draft tube. There is a secondary peak at 9fn. Considering the compressibility, the amplitude of the fluctuation decreases, but the flow is more complex and the pressure fluctuation is more chaotic.
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