Energy dissipation method

Abstract

The present invention discloses an energy dissipation method which utilizes a turned-slope type hydraulic jump stilling basin for energy dissipation. The length of the turned-slope type hydraulic jump stilling basin can be obtained by the following method: the first step: calculating the flow energy ratio K according to the lockage unit discharge q at the weir crest and the water head delta zeta of upstream and downstream of the weir; the second step: when the numeric area of K ranges from 0.5 to 3.0, respectively calculating the horizontal distance Lc of a weir nappe from the tail end of an inverse arc to the cross section before jump, the height difference Zc from a base plate of the basin to the water surface before jump, the Froude number Fr1 of the jump head cross section, the Froude number Frc at the tail end of the inverse arc and the energy dissipation ratio eta of turned-slope type hydraulic jump by using formulas; and the third step: designing the turned-slope type hydraulic jump stilling basin according to all the data calculated in the second step. The energy dissipation method is simple and convenient in calculation and fairly conforms to the actual engineering design; and as for the turned-slope type hydraulic jump stilling basin designed by using the hydraulic design method, an auxiliary energy dissipator is not required, and the turned-slope type hydraulic jump stilling basin is simple in contour arrangement, is easy for engineering construction and is slight in downstream scouring.

Description

technical field [0001] The invention relates to an energy dissipation method, in particular to a 3 / s large single-width flow rate, low Froude number around 1.5, and high tail water level layout conditions. Background technique [0002] Flood discharge and energy dissipation of overflow dams under the conditions of large single-width discharge, low Froude number, and high tail water level are often encountered problems in water conservancy and hydropower projects. Usually the way to solve the problem is to use auxiliary energy dissipators such as wide tail piers, T-shaped piers, big toe piers, and stilling beams. However, for a single width flow rate of 138 ~ 289.3m 3 / s, the water head above the weir varies from 17.0m to 27.6m, and the overflow dam whose downstream water level is above the weir crest is 6.5m to 18.1m superhigh, because it exceeds the applicable conditions for the aforementioned auxiliary energy dissipation in existing projects, Experimental studies have ...

AI Technical Summary

Problems solved by technology

However, for a single width flow rate of 138 ~ 289.3m 3 / s, the water head above the weir varies from 17.0m to 27.6m, and the overflow dam whose downstream water level is 6.5m to 18.1m above the weir crest is beyond the applicable conditions of the aforementioned auxiliary energy dissipation in existing projects. Experimental studies have shown that the aforementioned auxiliary energy dissipators are not feasible

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