Rotational flow vertical shaft flood discharge tunnel with staggered platform type volute chamber small flip bucket

Abstract

A rotational flow vertical shaft flood discharge tunnel with a staggered table type volute chamber flip bucket comprises a lock chamber inlet, an upper flat section, a volute chamber, a contraction section and a vertical shaft straight section, a flow guide flip bucket is arranged on the inner side wall, close to one side of the tail end of the upper flat section in the water flow direction, of the volute chamber, and the flow guide flip bucket comprises a vertical face and a flow guide arc face intersecting with the vertical face. The rotational flow vertical shaft spillway tunnel further comprises an incoming flow aerator and a rotational flow aerator. The incoming flow aerator is formed by sudden expansion from the tail end, in the water flow direction, of the vertical wall face of the side, close to the flow guide flip bucket, of the upper flat section to the vertical face of the flow guide flip bucket, and the rotational flow aerator is formed by sudden expansion from the tail end, in the water flow direction, of the flow guide arc face of the flow guide flip bucket to the inner side wall of the volute chamber through the vertical face. The method has the effect of improving the cavitation and cavitation erosion resistance of the volute chamber and the inner side wall face of the vertical shaft straight section.

Description

technical field [0001] The invention relates to the field of flood discharge and energy dissipation in water conservancy and hydropower projects, in particular to a swirl shaft flood discharge tunnel with staggered vortex chambers and small ridges. Background technique [0002] The swirl shaft flood discharge tunnel is an energy dissipator that uses the rotation of water flow and incorporates a large amount of gas to increase the turbulent intensity of the water flow and dissipate energy itself. The energy effect is better, and it has attracted more and more attention from the field of water conservancy and hydropower engineering; especially as my country is currently in the stage of blowout development of hydropower construction, many high dams and large reservoirs with high water head, large flow, and deep canyons are under construction or In the planning stage, in the case that conventional discharge structures cannot achieve flood discharge and energy dissipation well, swi...

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Problems solved by technology

[0004] In view of the above-mentioned related technologies, the applicant believes that in the practical application of related technologies, the height of the shaft often needs to be increased, and the risk of cavitation and cavitation erosion on the wall of the shaft also increases accordingly. facilities to improve the anti-cavitation cavitation ability of the vortex chamber and shaft wall, and building a separate aeration facility will increase the engineering cost, and the structure of a separate aeration facility is usually more complicated, which will also increase the difficulty of engineering construction

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