Pump turbine first quadrant characteristic curve theoretical prediction method

Abstract

The invention provides a pump turbine first quadrant characteristic curve theoretical prediction method. Based on a turbine Euler equation, geometrical form parameters including a pump turbine runner inlet / outlet diameter, a rotating-in blade inlet / outlet mounting angle, a guide vane opening and the like are utilized, and the impact loss of a runner inlet, the water head loss in a runner and a tail water pipe, and a centrifugal force acting item are considered to obtain the reversed S characteristic of a pump turbine and a turbine area characteristic curve. The pump turbine first quadrant characteristic curve theoretical prediction method is applicable to an early stage development design of the pump turbine in a water pumping energy accumulation power station, and prediction and guide directions are provided for reversed S characteristic influences on the runner by the geometrical parameters of the pump turbine; and before the runner is subjected to a hydraulic model test, a turbine area primary characteristic curve is provided for an early stage adjusting guarantee design of the power station, and partial calculation and evaluation of adjusting guarantee is carried out, so that manpower and financial resources are saved, and the design efficiency is improved.

Description

technical field [0001] The invention belongs to the research field of hydraulic machinery characteristics, and relates to a theoretical calculation method for the first quadrant characteristic curve of a water pump turbine, in particular a method for predicting the reverse "S" zone characteristic curve of a wading pump turbine. Background technique [0002] With the rapid development of my country's economy and society, the power load is increasing rapidly, and the peak-to-valley difference is constantly increasing. Users' expectations for the quantity and quality of power supply are getting higher and higher. With its unique operation mode of peak-shaving and valley-filling, the pumped storage power station plays the functions of regulating load, promoting energy saving of the power system and maintaining the safe and stable operation of the power grid, and has become an important tool for power grid operation control. The pump turbine is the core equipment of the pumped st...

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Problems solved by technology

[0003] In the design stage of the pump-turbine runner, the runner is mainly designed based on design experience, and the root cause of the formation of the anti-"S" characteristic is not clear; the evaluation and improvement of the anti-"S" characteristic is mainly based on a large number of 3D numerical simulations and hydraulic models. Experiment, this kind of method has a long cycle and high cost

At the same time, in the design stage of pumped storage, before the model test of the pump-turbine is finalized, the characteristic curve cannot be determined, and the adjustment guarantee calculation of the runner is generally based on the characteristic curve of the pump-turbine with other similar parameters.

If there is no similar specific speed pump turbine for reference in the development of a pumped storage power station, the existing characteristic curve is difficult to meet the design requirements of the power station

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