Deformed inverse step rectifying energy dissipation method and stilling basin

Abstract

The invention discloses a deformed inverse step rectifying energy dissipation method and a stilling basin. A continuous inverse step tail on a bottom plate is adopted instead of the conventional tail body type, and water current is collided with inverse steps hierarchically, so that energy is dissipated hierarchically, water current collision, doping and a fluctuation flow state before drainage are enhanced, and collision energy dissipation is realized; a vertical drop is arranged at a front-end inlet; side walls on both sides are asymmetrically diffused towards a river heart side curved surface, and the edges of each step are arranged in a continuous L or saw-tooth form, thereby forming transverse and longitudinal three-dimensional deformed inverse step structures being lower at the inlets, higher at the outlets, lower on the river heart sides and higher on the near-bank sides, so that a hydraulic jump energy dissipation flow state is formed forcibly in the basin. Meanwhile, water current is fully diffused transversely and is guided towards the river heart side, so that the basis length can be shortened effectively, the energy dissipation rate is increased, the effects of dissipating energy and adjusting the flow speed distribution are achieve, water current discharged out of the basin returns into a groove smoothly, and downstream erosion is relieved. The deformed inverse step rectifying energy dissipation method and the stilling basin are suitable for a water flow state with low water head, large unit width flux (particularly greater than m<2> / s) and low Fr number (particularly Fr number is smaller than 2).

Description

technical field [0001] The invention belongs to the field of flood discharge and energy dissipation of water conservancy and hydropower projects, and relates to an energy dissipation method and a stilling pool. Background technique [0002] In water conservancy and hydropower discharge structures, when the discharge is connected with the downstream natural river, it is necessary to dissipate energy and adjust the flow velocity distribution. High water head and high Fr number (Note: Fr number is called Froude number, which is a hydraulic parameter, hereinafter referred to as "Fr number") discharge conditions, can be used to add water cushion ponds with deflected flow, or can be added with bottom flow or surface flow. Stilling pool and other measures to achieve the purpose of energy dissipation and anti-scour. However, the problem of energy dissipation for low water head, large single width, and low Fr number flow has always been difficult, especially the single width flow is...

AI Technical Summary

Problems solved by technology

However, the problem of energy dissipation for low water head, large single width, and low Fr number flow has always been difficult, especially the single width flow is extremely large (greater than 300m 2 / s) and the Fr number is extremely low (1~2), it is very difficult to dissipate the energy of the water flow

For the reverse step (that is, the plane elevation of each step rises step by step along the direction of water flow) energy dissipation method, a single step type (such as ridge, pier, etc.) is mostly used in current projects, which can also be understood as a reverse step form for rectification Or promote the hydraulic jump, but the energy dissipation effect needs to be improved

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