IAHR Document Library

« Back to Library Homepage « Proceedings of the 33rd IAHR World Congress (Vancouver, 2009...

Experimental Study on the Drop Shaft Spillway Reconstructed from Diversion Tunnel

Author(s): Sun Shuangke; Xu Tibing; Xia Qingfu; Sun Gaosheng; Xie Weidong

Linked Author(s): Shuangke Sun

Keywords: Drop shaft; Circular intake; Stilling well; Energy dissipation

Abstract: The Dashimen Hydroelectric Power Station, of which the dam height is63.78m, is a multi-purpose project concerning the industry water supply, power generation, and flood control. The drop shaft spillway is only one outlet structure of this project and has a special conformation reconstructed from diversion tunnel, its maximum flow capacity is about 148m3/s. In this paper, hydraulic model test is carried out to study the hydraulic characteristics of this spillway and optimize the layout of stilling well. It is indicated that the spillway is safer than traditional spillway with the wall pressing flow since the sudden enlargement configuation under the circular intake can induce supercavitating flow in the vertical shaft. Otherwise, this spillway has high energy dissipation due to the full-developed aerated flow and optimized layout of stilling well. The damping ratio is above83.1% ~91.6%.


Year: 2009

Copyright © 2023 International Association for Hydro-Environment Engineering and Research. All rights reserved. | Terms and Conditions