Rotational flow spillway tunnel for reducing flow velocity of outlet of rotational flow tunnel

A flood discharge tunnel and flow velocity technology, which is applied in hydroelectric power stations, coastline protection, sea area engineering, etc., can solve problems such as turbulence and corrosion of the diversion tunnel outlet flow state, reduce the water surface height difference, weaken the backwater phenomenon, and improve The effect of service life

Active Publication Date: 2021-07-09
POWERCHINA XIBEI ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problems of severe corrosion and disordered outlet flow in existing diversion tunnels, the present invention provides a swirl flood discharge tunnel that reduces the flow velocity at the outlet of the swi

Method used

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  • Rotational flow spillway tunnel for reducing flow velocity of outlet of rotational flow tunnel
  • Rotational flow spillway tunnel for reducing flow velocity of outlet of rotational flow tunnel
  • Rotational flow spillway tunnel for reducing flow velocity of outlet of rotational flow tunnel

Examples

Experimental program
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Effect test

Example Embodiment

[0025] Example 1:

[0026] In order to overcome the problem of severe corrosion and export fluid disorders, the present invention provides Figure 1-5 A swirling flooding hole shown in the exit flow rate of the swirl hole, the present invention has reduced the flow rate of the leak opening in the bottom of the flora opening, and the split pier is used to improve the flow of water flow, and ensure that the inner wall of the guide cave will not be Excessive water flow erosion increases the life of the guide cave.

[0027] A swirl flood opening, including a fluxed gate chamber 17, a pilot hole 1, a vortex 2, a shaft 10, a diffuse connection section, a diversion cell 12, and a guide hole 14, said The pilot hole 1 is connected upstream with the drain gate chamber 17, and the downstream of the pilot hole 1 is connected between the vortex 2, and the transition section 3 is provided with a divided water partition wall 4; the vortex 2 The lower end is connected to the shaft 10 by the shaft ...

Example Embodiment

[0029] Example 2:

[0030] Based on the first embodiment, in the present embodiment, preferred, the diffuse connection segment includes a vertical section 13, a turning section 15, and a compatible slope section 16, and the vertical segment 13 and the comparative slope section 16 Through the conversion section 15, the width of the turning section 15 and the slope section 16 is the same as the width A of the guide hole 14; the vertical segment 13 is transitioned from a shaft semicircular gradient to the outside as a circular arch, the inner side is a straight line. The top arch of the turning section 15 is a starting point in a vertical segment 13, and a 1 / 4 elliptical long-axis turning form transitions to a slope section 16 starting point, wherein the elliptical equation is , A, b determine according to the guide hole width A, and the value of the a value is (0.3 to 3) a, B is (0.3 to 1) a; the bottom portion of the turning section 15 is a reachable type, the bottom portion of th...

Example Embodiment

[0043] Example 3:

[0044] Based on the embodiment 1 or 2, in the present embodiment, it is preferable that the thickness of the side wall is 50 cm; the bottom plate 5 width D is 680cm, the bottom plate 5 slope is 1: 7.4, the top arch 6 slope slope ratio is 1: 8.6, the vortex 2 radius R is 500cm, the side wall of the back water surface and the transition section 3 is 300 cm, and the back water surface width A2 is 300 cm, the water surface arc radius R1 is 150cm, the side surface of the water surface and the side The distance between the walls is 410cm, and the distance between the two side two and the side walls 2 8 is 195cm, the distance between the axis of the water surface and the side walls is D3 is 240 cm, the bottom plate is 5 Slope point distance 2 center line distance is L1 is 4800cm, divided water separation wall 4 smooth water growth length L2 is 1500cm, divided water separation wall 4 back water surface can be 1150cm; divided water separation wall 4 starting point to tr...

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Abstract

The invention provides a rotational flow spillway tunnel for reducing flow velocity of an outlet of a rotational flow tunnel. The rotational flow spillway tunnel comprises a sluice gate chamber, a diversion tunnel, a volute chamber, a vertical shaft, an expansion body connecting section, a stilling pool and a flow guiding tunnel; the upstream of the diversion tunnel is connected with the sluice gate chamber; the downstream of the diversion tunnel is connected with the volute chamber through a transition section; a water division partition wall is arranged in the transition section; the lower end of the volute chamber is connected with the vertical shaft through a vertical shaft connecting section; the lower part of the vertical shaft communicates with the flow guiding tunnel through the expansion body connecting section; one end of the flow guiding tunnel is blocked; a flow dividing pier is arranged in the expansion body connecting section; and the stilling pool is arranged at the bottom of the vertical shaft. Water flow passes through the transition section and the water division partition wall, so that the thickness of rotating water flow in the volute chamber is increased, the altitude of a water surface is greatly reduced, and the water surface height difference of the rotating water flow in the volute chamber is also reduced. After the water flow reaches the stilling pool for stilling, the damming phenomenon of hydraulic jump is weakened and an energy dissipation space of pressure flow vortex rolling is enlarged through the expansion body connecting section.

Description

technical field [0001] The invention belongs to the technical field of swirl energy dissipation in water conservancy and hydropower projects, and in particular relates to a swirl flood discharge tunnel for reducing the flow velocity at the outlet of the swirl tunnel. Background technique [0002] The diversion facilities of hydropower projects in canyon areas generally adopt diversion tunnels and cofferdams. Due to the relatively abundant river flood flow in western my country, the scale of diversion tunnels is often large. The specific performance is that the cross-section of diversion tunnels is large and the number of tunnels is large. The corresponding project investment for each diversion tunnel is 100-200 million yuan. Therefore, after the diversion function is completed, it is of great economic value to transform the temporary structure of the diversion tunnel into a permanent drainage structure, and it is also conducive to optimizing the layout of the hub. Over the ...

Claims

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Application Information

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IPC IPC(8): E02B9/04E02B8/06
CPCE02B9/04E02B8/06Y02E10/20
Inventor 周恒刘静狄圣杰陆希丁新潮王卫国卫勇
Owner POWERCHINA XIBEI ENG
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