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Broken line inlet type hole plug energy dissipater

A technology of energy dissipation and hole plug, which is applied in sea area engineering, water conservancy engineering, coastline protection, etc. It can solve the problems of large construction work volume, hole plug damage, and low pressure, and achieve good anti-cavitation performance and energy dissipation effect Good, easy-to-make effects

Inactive Publication Date: 2012-01-18
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 (referring to Samuel O.Russell, James W.Ball.Sudden-enlargement energy dissipator for Mica dam.Journal of the hydraulics division ASCE, 7(1967): 41~56), the energy dissipator of this structure has a complex structure and a large amount of construction work, and is only suitable for projects with low operating water head and small operating flow. Energy itself is prone to cavitation damage
[0003] Chinese patent ZL200610021207.2 discloses a hole plug energy dissipator. The hole plug energy dissipator includes a step hole plug and a shrinkage hole plug. Although the problem of energy dissipation in the flood discharge tunnel under high water head is better solved, when the When the cavitation number of the water flow in front of the plug is small (that is, the pressure in front of the plug inlet is low and the flow velocity is high), the plug inlet is prone to cavitation, resulting in damage to the plug itself

Method used

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  • Broken line inlet type hole plug energy dissipater
  • Broken line inlet type hole plug energy dissipater
  • Broken line inlet type hole plug energy dissipater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] In this embodiment, the structure of the broken line inlet type hole plug energy dissipator is as follows: figure 1 , figure 2 As shown, it consists of the hole plug base body 1 and the flow holes set in the hole plug body. The flow holes are connected by two constricted truncated conical holes whose front ends are larger than the rear ends and have different tapers. The outlet of the frusto-conical hole 2 is the inlet of the following converging frusto-conical hole 3 .

[0022] The folding line inlet type hole plug energy dissipator described in this embodiment is used for the hole diameter D 0 = 15m spillway tunnel energy dissipation, the relevant dimensions are as follows: the total length L of the hole plug 0 =0.73D 0 = 11m, the length L of the front constricted frustoconical hole 1 =0.27L 0 = 3m, the inlet diameter D of the front constricted frustoconical hole 1 =0.87D 0 = 13m, the outlet diameter D of the front constricted frustoconical hole 2 = Inlet dia...

Embodiment 2

[0025] In this embodiment, the structure of the broken line inlet type hole plug energy dissipator is as follows: figure 1 , figure 2 As shown, it consists of the hole plug base body 1 and the flow holes set in the hole plug body. The flow holes are connected by two constricted truncated conical holes whose front ends are larger than the rear ends and have different tapers. The outlet of the frusto-conical hole 2 is the inlet of the following converging frusto-conical hole 3 .

[0026] The folding line inlet type hole plug energy dissipator described in this embodiment is used for the hole diameter D 0 = 15m spillway tunnel energy dissipation, the relevant dimensions are as follows: the total length L of the hole plug 0 =0.666D 0 = 10m, the length L of the preceding constricted frustoconical hole 1 =0.25L 0 = 2.5m, the inlet diameter D of the front constricted frustoconical hole 1 =0.8D 0 = 12m, the outlet diameter D of the front constricted frustoconical hole 2 = Inl...

Embodiment 3

[0029] In this embodiment, the structure of the broken line inlet type hole plug energy dissipator is as follows: figure 1 , figure 2 As shown, it consists of the hole plug base body 1 and the flow holes set in the hole plug body. The flow holes are connected by two constricted truncated conical holes whose front ends are larger than the rear ends and have different tapers. The outlet of the frusto-conical hole 2 is the inlet of the following converging frusto-conical hole 3 .

[0030] The folding line inlet type hole plug energy dissipator described in this embodiment is used for the hole diameter D 0 = 15m spillway tunnel energy dissipation, the relevant dimensions are as follows: the total length L of the hole plug 0 =0.73D 0 = 11m, the length L of the front constricted frustoconical hole 1 =0.18L 0 = 2m, the inlet diameter D of the front constricted frustoconical hole 1 =0.8D 0 = 12m, the outlet diameter D of the front constricted frustoconical hole 2 = Inlet diam...

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Abstract

The invention relates to a broken line inlet type hole plug energy dissipater used for a pressure spillway tunnel. The broken line inlet type hole plug energy dissipater comprises a hole plug base and an overflowing hole arranged in the hole plug base, the overflowing hole is formed by connecting two contract truncated cone-shaped holes which are provided with front ends larger than rear ends and are in different tapers, and the outlet of the front contract truncated cone-shaped hole is the inlet of the rear contract truncated cone-shaped hole. Total length L0 of a hole plug meets the following relation: L0=0.6 D0-2.5D0, the diameter D1 of the inlet of the front contract truncated cone-shaped hole meets the following relation: D1=0.6 D0-1.0D0, the ratio D1 / D2 of the diameter D1 of the inlet of the front contract truncated cone-shaped hole to the diameter D2 of the outlet of the front contract truncated cone-shaped hole is 1.05-1.3, the length L1 of the front contract truncated cone-shaped hole meets the following relation: L1 =0.1 L0-0.4L0, and the ratio D2 / D3 of the diameter D2 of the inlet of the rear contract truncated cone-shaped hole to the diameter D3 of the outlet of the rear contract truncated cone-shaped hole is 1.05-1.4, wherein D0 is the diameter of a spillway tunnel in the relations.

Description

technical field [0001] The invention belongs to energy dissipation facilities used in water conservancy and hydropower projects, in particular to a hole plug energy dissipation device 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 (referring to Samuel O.Russell, James W.Ball.Sudden-enlargement energy dissipator for Mica dam.Journal of the hydraulics division ASCE, 7(1967): 41~56), the energy dissipator of this structure has a complex structure and a large amount of construction work, and is only suitable for projects with low operating water head and small operating flow. The energy itself is easy to be damaged by cavitation erosion. [0003] Chinese patent ZL200610021207.2 discloses a hole plug energy dissipator. The hole plug energy dissipator includes a step hole plug and ...

Claims

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Application Information

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IPC IPC(8): E02B9/06E02B8/06
CPCY02E10/22Y02E10/20
Inventor 许唯临王韦刘善均田忠张建民曲景学邓军张法星李乃稳
Owner SICHUAN UNIV
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