Multistage water cushion rotational flow vertical shaft flood discharging tunnel suitable for high water head

Abstract

The invention discloses a multistage water cushion rotational flow vertical shaft flood discharging tunnel suitable for a high water head. The multistage water cushion rotational flow vertical shaft flood discharging tunnel comprises an upper horizontal section, a volute chamber section, a contraction section, a vertical shaft section and a lower horizontal section. An energy dissipation water cushion device is arranged at the position of the vertical shaft section with the water flow speed of 30-35m / s and formed by the contraction section, a protruded expanded ring plate and a straight drum section. The inner ring edge of the protruded expanded ring plate is connected with the lower end of the contraction section, the outer ring edge is connected with the upper end of the straight drum section, vent holes communicated with a blind area and outside atmosphere are arranged at the position of the water flow blind area formed by connecting the straight drum section with the protruded expanded ring plate so that air can be aerated into water flow, and the water flow can flow through the contraction section to be annularly contracted to solid water flow due to the inner diameter of the lower end of the contraction section so as to form a water cushion on the contraction section. The rotational flow vertical shaft flood discharging tunnel is suitable for high water head hydropower engineering and can greatly improve energy dissipation efficiency, vertical shaft cavitation damage can be effectively avoided, energy dissipation pressure of the bottom water cushion can be reduced simultaneously, and bottom plate damage is avoided.

Description

technical field

[0001] The invention belongs to the technical field of energy dissipation and anti-corrosion in water conservancy projects, and relates to a swirl shaft flood discharge tunnel, in particular to a multi-stage water cushion swirl shaft flood discharge tunnel suitable for high water heads. Background technique

[0002] As a relatively new type of energy dissipation engineering facility, swirl shaft flood discharge tunnel has been used in water conservancy and hydropower projects with relatively low water head, especially because of its flexibility in turning, it has become more and more popular. In recent years, it has gradually The trend of popularization and application to high head water conservancy and hydropower projects. However, when vertical shaft swirl flood discharge tunnels are used in high water head hydropower stations, since the energy lost along the shaft wall is much smaller than the energy brought by the height difference, the water flow velocit...

Images