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

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...

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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

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