Deformation type outward convex transition stepped energy dissipation structure and energy dissipation method thereof

Abstract

The invention relates to a deformation type outward convex transition stepped energy dissipation structure and an energy dissipation method thereof. The structure comprises a front aerator, an outwardconvex transition stepped segment, a uniform stepped segment, unit blocks, hydraulic jacking devices and a controller. The front aerator, the outward convex transition stepped segment and the uniformstepped segment are sequentially arranged from the high position to the low position of an overflow dam. The outward convex transition stepped segment is uniformly divided into the multiple unit blocks, the corresponding hydraulic jacking device is mounted on the lower portion of each unit block, all the hydraulic jacking devices are controlled by a control system in a unified manner through control circuits, and the control system is used for controlling the hydraulic jacking units to drive the unit blocks to ascend and descend so as to adjust the stepped height of the outward convex transition stepped segment. According to the structure, under the action of the front aerator and the outward convex transition stepped segment, the aeration energy dissipation effect of water flow is increased to some extent, dam body safety of a flood releasing structure under different kinds of single width flow can be effectively protected, and cavitation and cavitation erosion of the overflow dam can be avoided.

Description

technical field [0001] The invention relates to a modified outwardly convex transitional ladder energy dissipation structure and an energy dissipation method thereof, belonging to the technical field of energy dissipation for stepped overflow dams of water conservancy and hydropower. Background technique [0002] A large number of experimental studies and engineering practices at home and abroad have shown that when the water flow velocity across the dam is high, the cavitation resistance can be improved by enhancing the strength of the flow wall material and controlling the unevenness. Not only the project cost is high, but also often The purpose of preventing cavitation cannot be achieved, and adding aerated corrosion reduction facilities is an economical and effective measure. Spillway design code stipulates that air-entrainment measures should be taken for discharge structures with a flow velocity greater than 30m / s. Due to the unreasonable design of the discharge struc...

AI Technical Summary

Problems solved by technology

Due to the unreasonable design of the discharge structure and the poor structural design of the connection between the WES surface and the stepped overflow dam, the discharge water flow cannot pass through the transition section smoothly, resulting in insufficient air entrainment on the overflow dam surface and localized dam surface. Larger negative pressure, resulting in cavitation cavitation damage

The current solutions are: the dam surface generates a large local negative pressure, resulting in cavitation cavitation damage

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