Water Science and Engineering 2010, 3(2) 200-207 DOI:   10.3882/j.issn.1674-2370.2010.02.008  ISSN: 1674-2370 CN: 32-1785/TV

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Drag reduction
Hydraulic model experiment
Spillway tunnel
YU Yang-Kui
JIANG Chun-Bei
Article by Yu,Y.K
Article by Jiang,C.B

Experimental Investigation of Tunnel Discharge Ability by Using Drag Reduction Techniques

Ying-kui WANG*, Chun-bo JIANG

State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, P. R. China


The experiments in an open flume model and in the spillway tunnel models were carried out by using drag reduction technique. The drag reduction experiments in open channel model adopted two techniques: polymer addition and coating. The drag reduction effect of polyacrylamide (PAM) solution and the dimethyl silicone oil coating were studied by the flume model experiments, and the results were satisfied. Then the experiments were carried out in the model of a Hydropower station, which is the second largest dam in China. In order to reduce the resistance, the spillway tunnel models were coated inside with the dimethyl silicone oil. It is the first time that applying the drag reduction technique in the large hydraulic model. The experimental results show that the coating technique can effectively increase the ability of flood discharge. The outlet velocity and the jet trajectory distance were also increased, which is beneficial to the energy dissipation of the spillway tunnel.

Keywords Drag reduction   Hydraulic model experiment   Spillway tunnel  
Received 2010-01-18 Revised 2010-06-25 Online: 2010-06-25 
DOI: 10.3882/j.issn.1674-2370.2010.02.008
Corresponding Authors: Ying-kui WANG
Email: jcb@tsinghua.edu.cn
About author:


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