Gradually-changed drop sill type stilling pool

Abstract

The invention provides a novel gradually-changed drop sill type stilling pool, which is composed of a flow guide connection slope section, a stilling pool main body section and a stilling pool tail sill reverse slope section sequentially connected in the water flow direction; the flow guide connection slope section is connected with an upstream flood discharge facility and is used for guiding water flow into the stilling pool; a drop sill is arranged at the joint of the flow guide connection slope section and the stilling pool main body section, and a bottom plate of the stilling pool main body section is a concave curved surface (the concave surface means downward concaving to the outside of the stilling pool water body), so that the height of the stilling pool drop sill is symmetricallyand gradually increased from two sides to the middle. The stilling pool can effectively improve the energy dissipation rate, reduces the hydraulic indexes near the bottom, and achieves the purposes ofreducing or even cancelling protection engineering of a bank slope of a downstream river channel of the stilling pool and saving construction fund.

Description

technical field [0001] The invention belongs to the field of flood discharge and energy dissipation facilities used in water conservancy and hydropower projects, in particular to stilling pools. Background technique [0002] In water conservancy and hydropower projects, flood discharge and energy dissipation are very prominent key technical issues, and the energy dissipation and anti-scour downstream of the discharge structures are directly related to the safety of the project. According to a rough statistical analysis of a large number of actual engineering data, the cost of flood discharge and energy dissipation accounts for about 40% to 50% of the total project cost, and the cost of energy dissipation and anti-scour facilities accounts for 40% to 50% of the discharge structure. . Therefore, choosing a suitable flood discharge structure is an important way to make rational use of funds. In many low and medium head hydropower stations, stilling basin energy dissipation is...

AI Technical Summary

Problems solved by technology

However, for a large single-width flow, the energy dissipation rate of the stilling tank is generally not very high, and the water flow out of the tank still contains a large amount of residual energy, causing the water surface fluctuations in the downstream of the river to propagate for a long distance, and the protection works for the river bank slope downstream of the stilling tank are increased.

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