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Method for improving flow regime of high velocity flow of sharp bend section in free-flow tunnel

A high-speed water flow and tunnel technology, applied in water conservancy projects, sea area projects, coastline protection, etc., to achieve the effects of reducing the water level of the pool, improving the flow pattern of the water flow, and reducing erosion

Active Publication Date: 2016-02-24
CHINA WATER NORTHEASTERN INVESTIGATION DESIGN & RES
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Problems solved by technology

[0009] The invention provides a method for improving the flow state of high-speed water flow in a sharp bend section in a non-pressure tunnel, so as to solve the problem of shock waves in the bend of the high-speed water flow non-pressure tunnel

Method used

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  • Method for improving flow regime of high velocity flow of sharp bend section in free-flow tunnel
  • Method for improving flow regime of high velocity flow of sharp bend section in free-flow tunnel
  • Method for improving flow regime of high velocity flow of sharp bend section in free-flow tunnel

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Embodiment Construction

[0063] This patent solves the flow state problem of the high-speed water flow in the sharp bend section of the non-pressure tunnel, and has wide applicability, and is applicable to the following two situations at the same time,

[0064] 1) The layout of various bends in high-speed water flow non-pressure tunnels is especially suitable for projects where the bends are relatively close to the working gate;

[0065] 2) The arrangement of various bends in medium and low velocity water flow non-pressure tunnels is especially suitable for the arrangement of sharp bends.

[0066] The specific implementation steps of the invention patent method are as follows:

[0067] 1) The entrance slope section of the stilling pool at the curve must be arranged on the straight section of the tunnel, but a certain distance must be kept from the working gate. In order to avoid submerged mixed flow water jumping up to the working gate under low water head operation, the slope section of the entrance...

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Abstract

The invention relates to a method for improving the flow regime of a high velocity flow of a sharp bend section in a free-flow tunnel, and belongs to engineering methods for improving the flow regime of the high velocity flow of the sharp bend section in the free-flow tunnel. The method comprises the steps of arranging a bend stilling pool inlet slope section on a straight-line section of the tunnel, and calculating the pool depth of a stilling pool through a derived bend stilling pool computing method; enabling the gradient of the bend stilling pool inlet slope to be the same as the injection angle of the flow, arranging stairs at the lower part of the inlet slope, and enabling the width of the bend stilling pool to be the same as the width of the tunnel body; arranging a bend stilling pool outlet slope section on a downstream straight-line section, arranging a stair-type slope at the stilling pool outlet slope section, and calculating the total length of the stilling pool, wherein the stair height is 1 / 2 of the pool depth of the stilling pool optimally. According to the method, the flow regime of the high velocity flow of the sharp bend section in the free-flow tunnel is improved, and the flow regime of the high velocity flows of various bends or the flow regime of middle and low velocity flows of sharp bend sections in the free-flow tunnel can be improved the same, so that the curve layout of the free-flow tunnel is more flexible, and the method has quite good practicability and application prospect.

Description

technical field [0001] The invention relates to an engineering method for improving the flow state of high-speed water flow in a sharp bend in a pressure-free tunnel. Specifically, a stilling pool is arranged on the sharp bend in the pressure-free tunnel to eliminate the shock wave of the high-speed water flow in the bend and improve the flow of water in the pressure-free tunnel. The method of water flow. Background technique [0002] Tunnel refers to a water hole dug in the mountain or underground. Hydraulic tunnels can be used for irrigation, power generation, water supply, discharge, water delivery, construction diversion and navigation. The water flow has a free water surface in the tunnel, which is called a pressure-free tunnel. [0003] High-speed water flow refers to water flow with a water flow velocity above 15m / s to 20m / s. Compared with medium and low-speed water flow, the change of high-speed water flow and water-passing boundary is very sensitive to the influe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02B8/06
CPCE02B8/06
Inventor 苏加林郭学仲王德库宗原王智高垠李旭光王超姜雪宾李小平王美懿包长才李广一赵青尹明玉赵立勇贺延国李强韩爽于洪利邓显羽肖家祥金贤任会
Owner CHINA WATER NORTHEASTERN INVESTIGATION DESIGN & RES
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