Conical swirling flow vertical shaft

Abstract

The invention discloses a conical swirling flow vertical shaft, which comprises a volute chamber section and a vertical shaft section connected with the volute chamber section, wherein the volute chamber section is provided with a water inlet for guiding water flow in an approach channel into a volute chamber from the tangential direction of the volute chamber section; and the vertical shaft section is a cone with large upside and small underside. In order to further improve the energy dissipation rate, the wall of the vertical shaft section of the conical swirling flow vertical shaft is provided with a step energy dissipater, the first step of the step energy dissipater is provided with an air vent, and the air vent is communicated with the top of the volute chamber section through a vent pipe to play a role in aeration and cavitation reduction.

Description

technical field [0001] The invention belongs to a swirl shaft used in water conservancy and hydropower projects, in particular to a swirl shaft suitable for high water head and large flow. Background technique [0002] The vortex shaft is a new type of flood discharge and energy dissipation facility. Since the water flow from the diversion channel enters the vortex chamber from the tangential direction of the vortex chamber section, it rotates around the axis of the shaft and flows close to the wall, forming a stable cavity in the center of the shaft, thus maintaining the water flow. The flow state is stable and good ventilation conditions can be formed. However, engineering practice shows that under the conditions of large flow and high water head, the following problems exist in the swirl shaft: 1) the flow velocity in the shaft is too high, and the risk of cavitation and cavitation on the wall surface increases; 2) due to the centrifugal force of the water flow, the conve...

AI Technical Summary

Problems solved by technology

However, engineering practice shows that under the conditions of large flow and high water head, the following problems exist in the swirl shaft: 1) the flow velocity in the shaft is too high, and the risk of cavitation and cavitation on the wall surface increases; 2) due to the centrifugal force of the water flow, the conventional It becomes very difficult to aerate the annular aeration sill, and cannot play the role of aeration and corrosion reduction

Although the aeration effect of this kind of swirl shaft is obvious under the conditions of large flow and high water head, the water and air are fully mixed, the air content of the water flow is greatly increased, the flow state of the water flow is stable, and the cavitation cavitation damage on the shaft wall is eliminated, but The energy dissipation rate needs to be further improved

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