Method for improving hydraulic properties of water inlet/outlet of lower storage reservoir of pumped storage power station

Abstract

The invention relates to a method for improving the hydraulic properties of a water inlet / outlet of a lower storage reservoir of a pumped storage power station. According to the method, by taking a series of engineering measures such as arranging a vortex prevention beam section, an adjustment section, a diffusion section and a round-to-square transition section, the distribution conditions of flow fields of the water inlet / outlet are improved, the hydraulic parameters such as the flow rate nonuniform coefficient, the flow distribution coefficient, head loss and the head loss coefficient are controlled within the reasonable range, and harmful backflow and ring current and fracture surface negative pressure are eliminated, so that the fracture surface pressure changes stably along the river, and the hydraulic conditions of the water inlet / outlet are improved.

Description

technical field [0001] The invention relates to a method for improving the hydraulic characteristics of an inlet and outlet of a lower reservoir of a pumped storage power station, and belongs to the technical field of fluid mechanics of hydropower engineering. Background technique [0002] A pumped storage power station is a hydropower station that pumps water to the upper reservoir by using the electric energy when the power load is low, and then releases the water to the lower reservoir to generate electricity during the peak power load period. Since the pumped storage power station can regulate frequency and phase, stabilize the frequency and voltage of the power system, and can be used for emergency backup, the pumped storage power station is being built on a large scale in my country. Due to the special functionality of the pumped storage power station, that is, this kind of hydropower station has both pumping and power generation conditions, the water inlet and outlet ...

AI Technical Summary

Problems solved by technology

Due to the special functionality of the pumped storage power station, that is, this kind of hydropower station has both pumping and power generation conditions, the water inlet and outlet of the lower reservoir of the pumped storage power station are integrated, and the water outlet is the water outlet under the power generation condition. Under normal circumstances, it is the water inlet. The water flow at the water inlet and outlet can flow in both directions under different operating conditions of the power station, which leads to the complexity of the water inlet and outlet.

[0003] Due to the complexity of the inlet and outlet of the lower reservoir of the pumped storage power station, and the water flow state at the inlet and outlet of the lower reservoir of the pumped storage power station is easily affected by the body shape, if the shape of the inlet and outlet of the lower reservoir is not designed properly, it is easy to occur at the inlet and outlet of the lower reservoir. Phenomena such as water flow separation area, reverse flow velocity, harmful vortex, section negative pressure and uneven water flow diffusion directly affect the operation efficiency of the power station and the safety and stability of the power station

At present, the water inlets and outlets of the lower reservoirs of domestic pumped storage power stations generally have a series of unfavorable hydraulic problems, such as relatively large flow rate uneven coefficient, large flow non-uniformity and flow distribution coefficient, large head loss and head loss coefficient

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