Impedance hole and method for accelerating attenuation of water-level fluctuation of pressure regulation chamber

Abstract

The invention discloses an impedance hole and method for accelerating attenuation of water-level fluctuation of a pressure regulation chamber. The impedance hole is formed by additionally arranging a movable baffle and a buffer device at an impedance orifice of the pressure regulation chamber. The method comprises the steps that the area of the impedance orifice is made to change automatically in a transition process, the baffle is opened rapidly when water flow in a tunnel enters the pressure regulation chamber, the area of the impedance hole is large, and thus water hammer waves can be reflected quite well; and when the water flow in the pressure regulation chamber starts to flow backwards, the movable baffle is closed, the area of the impedance hole is decreased in the backflow process, the head loss of the water flow flowing through the impedance hole is increased, and the attenuation of the water-level fluctuation of the pressure regulation chamber is accelerated. All relevant dimensions and the opening angle of the movable baffle can be determined according to a derived computational formula. According to the impedance hole and method for accelerating the attenuation of the water-level fluctuation of the pressure regulation chamber, on the premise that other regulation and maintenance requirements are met, the attenuation of the water-level fluctuation of the pressure regulation chamber can be greatly accelerated, and the regulation quality of a power station is improved.

Description

technical field [0001] The invention relates to the technical field of a surge chamber of a hydropower station, in particular to an impedance hole form for accelerating the attenuation of water level fluctuations in the surge chamber, which is suitable for the surge chamber of a hydropower station. Background technique [0002] The structure of the existing impedance surge chamber is as follows figure 1 As shown, it includes a water diversion tunnel 1 and a surge chamber 2 , and an impedance hole connecting the water diversion tunnel 1 and the surge chamber 2 is provided on the surge chamber bottom plate 7 . For hydropower stations with super-long diversion tunnels, the inertia of the water flow in the pipelines is large due to the length of the diversion tunnels being too long. When the load shedding occurs on the unit, the water flow in the tunnel pours into the surge chamber under the action of inertia, causing the water level in the surge chamber to rise rapidly, and th...

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Problems solved by technology

But at the same time, the size of the impedance hole also affects the effect of the surge chamber reflecting the water hammer wave. If the area is too small, the pressure of the volute of the unit during load shedding may be too high and the water hammer will penetrate the chamber.

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