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Cavity filling water control below aerator devices

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Abstract

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.

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Authors and Affiliations

  1. College of Water Conservancy and Hydropower Engineering, Hohai University, Nan**g, 210098, China

    Shang-tuo Qian  (钱尚拓), Jian-hua Wu  (吴建华) & Fei Ma  (马飞)

  2. Hydraulic Structures design division, Hydrochina Huadong Engineering Corporation, Hangzhou, 310014, China

    Jian-rong Xu  (徐建荣), Yu Peng  (彭育) & Zhen Wang  (汪振)

Authors
  1. Shang-tuo Qian  (钱尚拓)
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  2. Jian-hua Wu  (吴建华)
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  3. Fei Ma  (马飞)
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  4. Jian-rong Xu  (徐建荣)
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  5. Yu Peng  (彭育)
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  6. Zhen Wang  (汪振)
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Corresponding author

Correspondence to Jian-hua Wu  (吴建华).

Additional information

Project supported by the National Natural Science Foundation of China (Grant No. 51179114).

Biography: QIAN Shang-tuo (1988-), Male, Ph. D. Candidate

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Qian, St., Wu, Jh., Ma, F. et al. Cavity filling water control below aerator devices. J Hydrodyn 26, 424–430 (2014). https://doi.org/10.1016/S1001-6058(14)60048-2

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  • DOI: https://doi.org/10.1016/S1001-6058(14)60048-2

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