Reducing and sudden expansion type inner energy dissipator

Abstract

The invention provides a reducing and sudden expansion type inner energy dissipater. The energy dissipater consists of a matrix and an overflow hole arranged in the matrix, wherein, the overflow hole is in a contractible cone frustum shape, the inlet of the overflow hole is bigger than the outlet of the overflow hole, the diameter of the inlet of the overflow hole is equal to the diameter D1 of a flood discharge hole, the diameter D2 of the outlet of the overflow hole is equal to 0.1D1-0.7D1, and the overflow hole and the matrix have the equal length of L0 which is equal to 0.4D1-2.5D1. The reducing and sudden expansion type inner energy dissipater can be applied to energy dissipation in the pressured flood discharge hole; when in use, at least one reducing and sudden expansion type inner energy dissipater is arranged in the pressured flood discharge hole; and in the case of at least two reducing and sudden expansion type inner energy dissipaters, the distance between two neighboring energy dissipaters is at least 2D1, wherein, D1 is the diameter of the flood discharge hole.

Description

technical field [0001] The invention belongs to energy dissipation facilities used in water conservancy and hydropower projects, in particular to an energy dissipation facility used for energy dissipation in pressurized flood discharge tunnels. Background technique [0002] In 1967, Samuel O.Russell etc. disclosed a method of utilizing the sudden shrinkage and expansion of water flow to cause head loss to dissipate energy (see Samuel O.Russell, James W.Ball.Sudden-enlargement energy dissipator for Mica dam.Journal of the hydraulics division ASCE, 7(1967): 41~56), the structure of the energy dissipator of this structure is complicated, and the construction volume is large. It is only suitable for projects with low operating water head and small operating flow. When the water head exceeds 100m, the energy dissipation The tool itself is prone to cavitation damage. [0003] Chinese patent ZL200610021207.2 discloses a hole plug energy dissipator. Although the hole plug energy di...

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Problems solved by technology

[0002] In 1967, Samuel O.Russell etc. disclosed a method of utilizing the sudden shrinkage and expansion of water flow to cause head loss to dissipate energy (see Samuel O.Russell, James W.Ball.Sudden-enlargement energy dissipator for Mica dam.Journal of the hydraulics division ASCE, 7(1967): 41~56), the structure of the energy dissipator of this structure is complicated, and the construction volume is large. It is only suitable for projects with low operating water head and small operating flow. When the water head exceeds 100m, the energy dissipation The tool itself is prone to cavitation damage

[0003] Chinese patent ZL200610021207.2 discloses a hole plug energy dissipator. Although the hole plug energy dissipator solves the problem of energy dissipation in the flood discharge tunnel under high water head, its inlet section is prone to cavitation under high water head.

In order to adapt to the working conditions of high water head, it is necessary to expand the inlet and outlet areas during application, that is, to increase the area shrinkage ratio, which reduces the energy dissipation rate of single-stage hole plugs, so it is necessary to set up multi-stage hole plugs. In the embodiment, it is 3 levels) to meet the energy dissipation requirements of the project, and the increase in the number of levels of hole plug energy dissipation will inevitably increase the project cost and prolong the construction period

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