Heterotype sudden enlargement and sudden drop aerator

Abstract

The invention discloses a heterotype sudden enlargement and sudden drop aerator, which takes the shape of a dust pan as a whole and comprises a triangle wedge block arranged on two side walls of a flood tunnel and a drop sill under the flood tunnel; wherein the triangle wedge block is arranged from a position of the section of the flood tunnel which suddenly widens from narrow and extends outward by taking the side wall of the flood tunnel as a right-angle side; the height and the length of the triangle wedge block are determined according to hydraulic elements such as the flow rate of discharge water current, depth of water and the like. The invention solves the key technical problem of water current safe discharge when the shape and size of the section of the anti-arc end of the flood tunnel with high head and great water-volume changes; when in use, high-velocity flow flows out of a pit first and late, the upside water current firstly flows out of the pit and firstly spreads; the bottom water current later flows out of a wall and later spread; the divergent flow and side wall cross orbit are reasonably controlled; the strength of water-wing can be effectively inhibited during prompting the near wall water current aeration of the side wall; water flow pattern is improved; the bottom-cavity and the side cavity of the drop aerator have good communication state, smooth aeration; and meanwhile, the heterotype sudden enlargement and sudden drop aerator has the advantages of simple structure and easy construction.

Description

technical field [0001] The invention relates to aeration and corrosion reduction facilities for drainage structures, in particular to a special-shaped sudden expansion and sudden drop aeration sill, which is suitable for drainage structures of water conservancy and hydropower projects such as flood discharge tunnels with high flow rate and large discharge volume. Background technique [0002] At present, aerated corrosion reduction facilities are often used in high-head and large-flow spillway tunnels to protect the flow surface from cavitation damage. Two factors are mainly considered in the design of sudden expansion and sudden drop aeration sills: (1) The strength of the water fin caused by sudden expansion should not be too large, so as not to affect the operation of the building. (2) The cavity downstream of the sill is stable, and the water flow is fully aerated to avoid excessive negative pressure in the clear water area. However, in the conventional sudden expansion...

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Problems solved by technology

Moreover, the existing sudden expansion and sudden drop type aeration and corrosion reduction facilities are generally used at the connection between pressure tunnels and open flow tunnels, and sudden expansion and sudden drop aeration facilities are used in open flow flood discharge tunnels with high water head and large flow There is no precedent

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