Diffusion type curve trajectory bucket

Abstract

This is a novel outstretch curve bucket lip for drain hole. A reverse arc curve of bigger diameter is connected to the slop of a pressure drain hole with the slop tangent to the curve. Another reverse arc curve of smaller diameter is then tangent to the previous curve. Drained water is heaved up after the curves of an angle 66.25 deg.. The traditional bucket lip is of a rectangle outlet, while the novel one is of an outstretching angle o f6-8 deg. at 5-8 meters from the outlet. With the novel design, water diffusion is enhanced as well as avoiding cavitation erosion and decreasing drained water speed.

Description

technical field [0001] The invention belongs to the technical field of dam engineering design for water conservancy projects, and relates to a novel type of energy dissipator for a drainage structure - a diffused curved deflector nose sill. Background technique [0002] In recent years, my country's high dam flood discharge and energy dissipation technology has developed rapidly, and there are more and more researches and applications on dam flood discharge and energy dissipation. The deflected flow energy dissipation is the most commonly used energy dissipation method for high-head drainage buildings. One of the keys to deflected flow energy dissipation is the selection of the shape of the deflected flow nose sill. The basic criterion for choosing a ridge is the quality of the water flow in the ridge and after the overhang. A reasonable shape of the nose sill, uniform pressure distribution in the sill, smooth flow of water flow, smoothly guide the discharged water flow dow...

AI Technical Summary

Problems solved by technology

The commonly used sill type is the continuous solid sill, and the structural layout is relatively simple. Generally, the slope section is connected to the anti-arc section, and the sill is raised at an angle of 15° to 35°. The discharge capacity is not large, and sometimes the flow state is poor. The anti-arc section is prone to cavitation and cavitation, which is very unfavorable to the downstream riverbed. When the design is unreasonable, the lifting distance is relatively short, and the scour pit is very deep, which directly endangers the foundation safety of the dam, and the atomization during flood discharge is also serious

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