Variable-curvature open channel bend

A technology of variable curvature and bend, which is applied in the field of diversion and river management in water conservancy projects. It can solve the problems of uneven pressure distribution, high water surface, and turbulent water flow in bends, so as to achieve uniform pressure distribution and cavitation erosion. The effect of reducing the probability of damage and smooth flow of water

Inactive Publication Date: 2018-09-21
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to address the deficiencies of the prior art and provide a variable-curvature open channel bend, which can solve the problems of turbulent water flow in the bend, super-high water surface, and uneven pressure distribution without affecting the flow-through capacity of the bend. , and reduce the possibility of cavitation cavitation erosion

Method used

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  • Variable-curvature open channel bend
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Examples

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Embodiment 1

[0051] The variable curvature open channel bend in this embodiment is applied to the left bank spillway of a certain project, and the structure is as follows figure 1 , figure 2 As shown, it is composed of a bottom plate 2 curved along the direction of water flow and side walls 1 arranged along both sides of the bottom plate. image 3 .

[0052] In the model test, the length of the bottom plate of the variable curvature curve is M=5m. According to the actual engineering conditions, the maximum direction angle of the variable curvature curve is set to ω=45°, and the width of the bottom plate is B=0.3m.

[0053] Take the line connecting the midpoint of the bottom plate of the entrance section of the curve and the midpoint of the bottom plate of the exit section of the curve as the x-axis, take the midpoint of the above-mentioned line as the origin of the coordinates, and take the line passing through the origin of the coordinates and perpendicular to the x-axis as the y-axis t...

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Abstract

The invention discloses a variable-curvature open channel bend. The variable-curvature open channel bend is composed of a base plate and side walls, wherein the base plate is bent in the water flow direction, and the side walls are arranged along the two sides of the base plate. A connection line between the midpoint of a bend inlet fracture surface base plate and the midpoint of a bend outlet fracture surface base plate serves as the x axis, the midpoint of the connection line serves as a coordinate origin, and a straight line which passes through the coordinate origin and is perpendicular tothe x axis serves as the y axis, so that a rectangular plane coordinate system is established. In the coordinate system, the convex bank edge curvilinear equation of the base plate can be found in the specification; and the concave bank edge curvilinear equation of the base plate can be found in the specification. By means of the variable-curvature open channel bend, the problems that bend waterflow is disorderly in flow state, the water surface superelevation is large, and pressure intensity is distributed nonuniformly can be solved; meanwhile, the discharging capacity of the bend is not affected; and the cavitation and cavitation erosion possibilities are lowered.

Description

technical field [0001] The invention belongs to the field of water diversion and river course management in water conservancy projects, and in particular relates to an open channel bend capable of controlling the flow state of torrent water flow, superelevation of water surface and pressure distribution. Background technique [0002] Due to topography, geology and hub layout, open channel bends exist in large numbers in water conservancy projects, such as spillways, water diversion projects and river control projects. After the water flow enters the bend, it will be affected by gravity and centrifugal force, which will cause phenomena such as superelevation of the water surface, spiral flow and rapid shock waves, which will cause the phenomenon of concave bank erosion, convex bank exposed bottom, uneven pressure distribution, etc., affecting the flow effect, and in serious cases will cause Cavitation cavitation, endangering the safety of the structure. The root cause of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02B1/02E02B8/06
CPCE02B1/02E02B8/06
Inventor 王韦丁灿田忠许唯临刘善均张建民邓军曲景学余挺张法星周茂林
Owner SICHUAN UNIV
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