Method for judging superposed vibration frequency of water turbine movable guide vane flow field

The invention discloses a method for judging superposed vibration frequency of a water turbine movable guide vane flow field. Finite element numerical calculation, classical formula calculation and water turbine vibration test of the water turbine movable guide vane are carried out; and pressure pulsation test is carried out, comparative analysis is carried out on the extracted calculation frequency of the movable guide vane of the water turbine and the frequency of the water turbine, and when the calculation frequency is completely consistent with the frequency of the water turbine, the flowfield superposition vibration frequency of the movable guide vane of the water turbine is obtained through identification. The method can be applied to identifying the vibration frequency generated bysuperposing the flow fields of the movable guide vane of the water turbine; the method can effectively identify whether the movable guide vane of the water turbine has the problem of flow field superposition vibration frequen