Cavity filling water control below aerator devices

With the rapid development of high dam projects within China, the dragon-drop-tail spillway tunnel is introduced and widely used. In view of the high water head and the large flow velocity on the dragon-drop-tail section, aerator devices are usually placed for the cavitation damage control. For the...

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Published in:Journal of hydrodynamics. Series B 2014-07, Vol.26 (3), p.424-430
Main Author: 钱尚拓 吴建华 马飞 徐建荣 彭育 汪振
Format: Article
Language:English
Subjects:
Aerators
Devices
Drag (hindrance)
dragon-drop-tail spillway tunnel
Engineering
Engineering Fluid Dynamics
filling water
Fluid dynamics
Fluid flow
Holes
Hydrology/Water Resources
Impact angle
local slope
low Froude number
Numerical and Computational Physics
Simulation
Slopes
几何形状
坡度设计
曝气装置
曝气设备
水控制
汽蚀破坏
流动状态
腔体
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creator 钱尚拓 吴建华 马飞 徐建荣 彭育 汪振
description With the rapid development of high dam projects within China, the dragon-drop-tail spillway tunnel is introduced and widely used. In view of the high water head and the large flow velocity on the dragon-drop-tail section, aerator devices are usually placed for the cavitation damage control. For the device placed in its initial position, it is a serious concern to design a suitable flow regime of the cavity and to control the cavity filling water due to the large flow depth and the low Froude number through this aerator. In this study, the relationships between the geometries of the aerator device and the jet impact angle of the lower trajectory of the flow are theoretically analyzed with/without a local slope. Nine test cases with different geometries are designed, the effectiveness of the filling water control is experimentally investigated under different operation conditions, and two criteria of the local slope design are proposed. It is concluded that the cavity flow regime and the filling water can be improved if a small impact angle and some suitable geometries of the local slope are designed.
doi_str_mv 10.1016/S1001-6058(14)60048-2
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In view of the high water head and the large flow velocity on the dragon-drop-tail section, aerator devices are usually placed for the cavitation damage control. For the device placed in its initial position, it is a serious concern to design a suitable flow regime of the cavity and to control the cavity filling water due to the large flow depth and the low Froude number through this aerator. In this study, the relationships between the geometries of the aerator device and the jet impact angle of the lower trajectory of the flow are theoretically analyzed with/without a local slope. Nine test cases with different geometries are designed, the effectiveness of the filling water control is experimentally investigated under different operation conditions, and two criteria of the local slope design are proposed. 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identifier ISSN: 1001-6058
ispartof Journal of hydrodynamics. Series B, 2014-07, Vol.26 (3), p.424-430
issn 1001-6058
1878-0342
language eng
recordid cdi_wanfang_journals_sdlxyjyjz_e201403010
source Elsevier
subjects Aerators
Devices
Drag (hindrance)
dragon-drop-tail spillway tunnel
Engineering
Engineering Fluid Dynamics
filling water
Fluid dynamics
Fluid flow
Holes
Hydrology/Water Resources
Impact angle
local slope
low Froude number
Numerical and Computational Physics
Simulation
Slopes
几何形状
坡度设计
曝气装置
曝气设备
水控制
汽蚀破坏
流动状态
腔体
title Cavity filling water control below aerator devices
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