Rotational flow tunnel structure capable of increasing horizontal rotational flow energy dissipation rate
A swirl hole and horizontal technology, which is applied in hydropower, water conservancy projects, hydropower stations, etc., can solve the problems of low efficiency of horizontal swirl, large project investment, etc., achieve good energy discharge effect, reduce project investment, and reduce kinetic energy The effect of increasing the energy dissipation rate
Inactive Publication Date: 2021-07-27
POWERCHINA XIBEI ENG
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Problems solved by technology
[0005] The purpose of the present invention is to provide a swirl tunnel structure that improves the energy dissipation rate of the horizontal swirl, so as to solve the problems of low efficiency of the horizontal swirl and large engineering investment proposed in the above-mentioned background technology
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[0048] Q=1040, D1=10m, D2=6m, R1=0.5m, L1=30m, L2=35m, L3=25m, L4=10m, L5=5m, n=4;
[0049] The length and diameter of the variable-diameter swirl hole 5 and the equal-diameter swirl hole 7, and the total number of hole wall bosses 8, the optimal parameters need to be determined through model tests or hydraulic simulations, which depend on flow, flow velocity, and energy dissipation rate Wait.
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The invention discloses a rotational flow tunnel structure capable of increasing the horizontal rotational flow energy dissipation rate. The rotational flow tunnel structure comprises a horizontal rotational flow well, wherein the horizontal rotational flow well is used for horizontally performing flood discharge operation on water flow. According to the rotational flow tunnel structure capable of increasing the horizontal rotational flow energy dissipation rate, the upstream of a rotational flow tunnel is connected with a swirling chamber, the downstream of the rotational flow tunnel is connected with a transition section and a spillway tunnel, the rotational flow tunnel is composed of a variable-diameter section and an equal-diameter section, water flow enters the variable-diameter section of the rotational flow tunnel from the tangent line of the swirling chamber under certain pressure, fluid which continuously flows spirally moves towards the spillway tunnel along the rotational flow tunnel, and after water flow enters the variable-diameter section of the rotational flow tunnel, the inner diameter of the rotational flow tunnel is gradually reduced, so that the rotation speed of fluid is increased, kinetic energy is increased, the kinetic energy dissipation rate is also increased, the pressure intensity of the tunnel wall is high under the action of the rotating centrifugal force of the water flow, and cavitation erosion damage is not easy to occur; and in addition, the energy dissipation mainly occurs in an inner spiral flow area near an air column formed in the rotational flow tunnel, and the change trend of the energy dissipation on the wall of the rotational flow tunnel is gentle, so that circular convex grooves are uniformly formed in the side wall of the equal-diameter section of the rotational flow tunnel so as to increase kinetic energy dissipation.
Description
technical field [0001] The invention relates to the technical field of flood discharge and energy dissipation in water conservancy and hydropower projects, in particular to a swirl tunnel structure for improving the energy dissipation rate of horizontal swirl. Background technique [0002] The diversion facilities of hydropower projects in canyon areas generally use diversion tunnels with cofferdams. In rivers with abundant floods, the scale of diversion tunnels is generally relatively large. The specific performance is that the diversion tunnels have large sections and many lines. The corresponding project investment of the 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. In the practice of rebuilding a flood discharge tunnel, the use of sw...
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IPC IPC(8): E02B9/04E02B8/06
CPCE02B8/06E02B9/04Y02E10/20
Inventor 周恒刘静陆希狄圣杰黄鹏张莹王卫国尹进步
Owner POWERCHINA XIBEI ENG