Multi-stage vertical shaft swirling combined energy dissipation structure

Abstract

The invention relates to the field of water conservancy and hydropower engineering as well as hydraulic energy dissipation and provides a whirling flow combined energy dissipation structure for a multi-stage vertical well. The whirling flow combined energy dissipation structure comprises an inlet section, a plurality of vertical well whirling flow sections, a plurality of connecting sections and a recede section and is characterized in that an output end of the inlet section is directly communicated with an input end of the first-stage vertical well whirling flow section; the first-stage vertical well whirling flow section is communicated with a second-stage vertical well whirling flow section through one connecting section; the vertical well whirling flow sections in the two adjacent stages are all communicated with each other through connecting sections until the tail-stage vertical well whirling flow section; and an output end of the tail-stage vertical well whirling flow section is directly communicated with the recede section. According to the invention, as the vertical well whirling flow sections in all stages are end to end, flood discharge and energy dissipation problems of a high water head of a hydropower station can be effectively solved; moreover, the whirling flow combined energy dissipation structure has the advantages of high energy dissipation rate, flexible layout, engineering investment conservation and shapable design.

Description

technical field [0001] The invention relates to the fields of water conservancy and hydropower engineering and hydraulic energy dissipation, and is a multi-stage shaft swirling combined energy dissipation structure. Background technique [0002] Swirling energy dissipation is to use the water flow to rotate in the vertical shaft or horizontal pipeline, so that the friction effect between the water flow and the side wall is greatly strengthened, the flow is significantly increased, the loss of the water flow along the process is increased, and the water flow in different flow directions is mixed to achieve For the purpose of reducing water flow energy, there are two kinds of energy dissipation structures, vertical shaft swirl and horizontal swirl, which are currently used in engineering. The shaft swirl energy dissipation structure uses the shaft swirl chamber to convert the horizontal flow velocity of the water inlet into the tangential flow velocity in the swirl shaft, incr...

AI Technical Summary

Problems solved by technology

If the height of the shaft is relatively small, the vertical kinetic energy converted from the gravitational potential energy of the water body in the shaft is small, so that the mixing of the water body at the bottom of the shaft is insufficient, and the energy dissipation rate is small; if the height of the shaft is relatively large, the level of the water body in the shaft will be reduced. The rotational flow velocity is reduced due to air resistance, which will also make the water body not fully mixed at the bottom of the shaft, and the energy dissipation rate will become smaller

And in the shaft swirl energy dissipation structure, since the energy dissipation rate of a single shaft is basically a certain value, with the increase of the acting water head, the flow velocity of the tail water in the retreat tunnel will also increase, which will have an adverse effect on the structural safety of the retreat tunnel, so The height range of the swirl energy dissipation structure for a single shaft is greatly limited

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