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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 swirl tunnel. The diversion pier is used to improve the flow state of the water flow, to ensure that the inner wall of the diversion tunnel will not be eroded by excessive water flow, and to improve the service life of the diversion tunnel

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

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Embodiment 1

[0026] In order to overcome the problems of severe corrosion of existing diversion tunnels and disordered outlet flow state, the present invention provides such Figure 1-5 Shown is a swirl flood discharge tunnel that reduces the flow velocity at the outlet of the swirl tunnel. The present invention adopts the expansion connecting section to reduce the flow velocity at the bottom of the flood discharge tunnel, and uses the diversion pier to improve the flow state of the water flow, so as to ensure that the inner wall of the diversion tunnel will not be damaged. Excessive water erosion improves the service life of the diversion tunnel.

[0027] A swirl flood discharge tunnel that reduces the flow velocity at the outlet of the swirl tunnel, comprising a discharge sluice chamber 17, a diversion tunnel 1, a vortex chamber 2, a vertical shaft 10, an expansion connecting section, a stilling pool 12 and a diversion tunnel 14. The upstream of the diversion tunnel 1 is connected to the...

Embodiment 2

[0030] Based on the basis of Example 1, in this embodiment, preferably, the expansion connecting section includes a vertical section 13, a turning section 15 and a slope section 16, and the vertical section 13 and the slope section 16 Connected by the turning section 15, the width of the side wall of the turning section 15 and the pressure slope section 16 is the same as the width A of the diversion tunnel 14; the vertical section 13 transitions gradually from a semicircle of the shaft to a body shape in which the outside is a round arch and the inside is a straight line; The top arch of the turning section 15 is based on the end of the vertical section 13 as the starting point, and transitions to the starting point of the pressure slope section 16 in the form of a 1 / 4 ellipse major axis turning, wherein the ellipse equation is , a, b are determined according to the width A of the diversion tunnel, and the value of a is (1~3)A, and the value of b is (0.3~1)a; the bottom of the...

Embodiment 3

[0044] Based on the basis of embodiment 1 or 2, in the present embodiment, preferably, the thickness of the side wall-7 is 50cm; the width D of the bottom plate 5 is 680cm, the slope ratio of the bottom plate 5 is 1:7.4, and the slope ratio of the top arch 6 slope section is 1:8.6, the radius R of the vortex chamber 2 is 500cm, the distance a1 between the backwater surface and the side wall-7 of the transition section 3 is 300cm, the width a2 of the backwater surface is 300cm, the arc radius R1 of the water-facing surface is 150cm, and the side wall-7 of the water-facing surface The distance between the first wall 7 is d1 is 410cm, the distance d2 between the second side of the water-facing surface and the second side wall 8 is 195cm, the distance between the central axis of the water-facing surface and the second side wall 8 is d3, which is 240 cm, and the bottom plate is 5 The distance between the slope point and the center line of the vortex chamber 2 is L1, which is 4800cm,...

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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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