A Prediction Method of Full Characteristic Curve of Francis Pump Turbine

Abstract

The invention discloses a predication method of the complete characteristic curve of a mixed-flow pump turbine. The predication method of the complete characteristic curve of the mixed-flow pump turbine comprises the steps that an internal characteristic analysis theory describing the flow complete characteristics and the moment complete characteristics are corrected through the feature of the actually measured pump turbine complete characteristic curve; statistics of unit parameters of feature operating points of the pump turbine complete characteristic curves of different specific speeds is conducted, the dominant function relationships between the unit parameter of each feature operating point and the optimal operating condition specific speed of the pump turbine and between the unit parameter of each feature operating point and the guide vane relative opening degree are established; and according to the dominant function relationships, the unit parameters of each feature operating point at different guide vane opening degrees are obtained, so that the undermined coefficient of the corrected internal characteristic analysis theory is determined, and a predicted complete characteristic curve of the pump turbine at any specific speed is obtained. The complete characteristic curve predicted by the adoption of the predication method is small in error, in this way, in a runner model simulation test, only a small number of feature working conditioner need to be tested, and the model test process is guided and accelerated.

Description

technical field [0001] The invention relates to the field of hydraulic design, in particular to a method for predicting the full characteristic curve of a mixed-flow pump turbine. Background technique [0002] With the continuous and rapid development of my country's economy and society, the peak-to-valley difference of the power grid is increasing day by day, and the insufficient peak-shaving capacity has gradually become a prominent problem restricting the development of my country's power system. As an excellent peak-shaving tool, the pumped-storage power station plays a role in solving the consumption problem of large-scale wind power development, peak-shaving pressure brought by large-scale grid-connected nuclear power, and improving the flexibility and security of smart grid operation. There is no substitute. [0003] However, unlike conventional hydropower stations, pumped-storage power stations switch rapidly, start and stop frequently, and the special bi-directiona...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the existing calculation method for the hydraulic transition process of the pumped storage power station cannot accurately guide the preliminary design of the project due to large errors due to the application of the water head, single unit capacity and the full characteristic curve of the pump turbine with similar specific speed question

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