Volute chamber diversion ridge for vortex shaft

Abstract

The invention discloses a volute chamber diversion ridge for a vortex shaft. A volute chamber diversion ridge body is arranged on a volute chamber wall face on one side of an upper horizontal sectionoutlet, and comprises a diversion cambered surface arranged in the direction where the water flow in the volute chamber rotates and a connecting surface arranged in the direction where the water enters the volute chamber. The diversion cambered surface and the connecting surface intersect in the water flow direction. The diversion cambered surface is in transitional smooth connection with the volute chamber wall face in the direction where the water flow in the volute chamber rotates. The connecting surface is arranged in the same plane with a corresponding upper horizontal section lateral wall in the direction where the water enters the volute chamber. The connecting surface is a cambered surface so as to form a cambered connecting surface. The cambered connecting surface is in transitional smooth connection with the corresponding upper horizontal section lateral wall in the direction where the water enters the volute chamber. The volute chamber diversion ridge body is adopted so as to reduce the angle between the connecting surface and the diversion cambered surface, achieve the effect that the water flow entering the volute chamber from the upper horizontal section is in smoothconnection with the water flow which rotates through a circle around the volute chamber, avoid inconvenience of blocking in a position where the upper horizontal section engages the volute chamber, and avoid water surge as well.

Description

Technical field [0001] The invention belongs to the technical field of flood discharge and energy dissipation in water conservancy and hydropower projects, and in particular relates to a vortex chamber diversion sill for a swirling shaft. Background technique [0002] Due to the advantages of low construction difficulty, flexible layout and outstanding energy dissipation effect, the swirling shaft flood discharge tunnel has attracted more and more attention from the water conservancy and hydropower engineering community. Especially as my country is currently in the blowout development stage of hydropower construction, many high-head, large-flow, deep canyon high-dams and reservoirs are under construction or in the planning stage. Conventional discharge structures cannot achieve good flood discharge and elimination. In the case of energy, the swirl shaft is a good choice as a newly developed flood discharge and energy dissipation structure. [0003] Existing swirl shaft flood discha...

AI Technical Summary

Problems solved by technology

[0004] However, the end of the upper flat section of the existing swirl shaft and the vortex chamber are connected through a small connecting plane of the vortex chamber diversion sill, and the intersection angle between the diversion arc surface and the connecting plane is still relatively large, so that the water flow in the upper flat section and the surrounding After the vortex chamber rotates once, the water flow collides at a large angle, causing part of the water flow to fall directly to the bottom of the well. In severe cases, the vortex cavity is even blocked, which cannot ensure the continuous and stable ventilation of the vortex cavity. In severe cases, water choking occurs; and the diversion arc The large intersection angle between the surface and the connecting plane may also cause the roof of the cave where the vortex enters to be blocked by the water splash generated by the collision, which cannot ensure the air replenishment of the vortex cavity by the upper flat section

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