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Effects of Bucket Type and Angle on Downstream Nappe Wind Caused by a Turbulent Jet

Author

Listed:
  • Jijian Lian

    (State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300350, China)

  • Junling He

    (State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300350, China)

  • Wenjuan Gou

    (State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300350, China)

  • Danjie Ran

    (State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300350, China)

Abstract

The downstream nappe wind caused by flood discharge has a great influence on the rainfall distribution, the operational safety of dams, and their surrounding ecological environments. A physical experiment was conducted to measure the spatial distribution of the downstream nappe wind and the splash for a continuous bucket (CB) and a tongue-shaped bucket (TB) for five bucket angles (40°, 45°, 50°, 55°, and 60°). The experimental results demonstrate that the trajectory width and height of the nappe increase as the angles increase, but the effect on the length is converse. The wind velocity and splash weight of the two buckets decrease along the flowing direction. In the lateral direction, the wind velocity and splash weight for the CB decrease as y increases, but the wind velocity of the TB trends to humplike; its splash weight decreases near the axis of the bucket, and is stable in the other region. In the vertical direction, the velocity for the CB increases and then decreases as z increases, but that for the TB decreases monotonously. The velocity of the wind and weight of the splash for the CB decreases with the increasing angles, but those of the TB peak at 45°. The findings are useful for the more accurate prediction of rainfall.

Suggested Citation

  • Jijian Lian & Junling He & Wenjuan Gou & Danjie Ran, 2019. "Effects of Bucket Type and Angle on Downstream Nappe Wind Caused by a Turbulent Jet," IJERPH, MDPI, vol. 16(8), pages 1-16, April.
    • Handle: RePEc:gam:jijerp:v:16:y:2019:i:8:p:1360-:d:223067
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    References listed on IDEAS

    as
    1. Jijian Lian & Xiaoqun Wang & Wenjiao Zhang & Bin Ma & Dongming Liu, 2017. "Multi-Source Generation Mechanisms for Low Frequency Noise Induced by Flood Discharge and Energy Dissipation from a High Dam with a Ski-Jump Type Spillway," IJERPH, MDPI, vol. 14(12), pages 1-23, November.
    2. Sternberg, R., 2010. "Hydropower's future, the environment, and global electricity systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 14(2), pages 713-723, February.
    3. Bartle, Alison, 2002. "Hydropower potential and development activities," Energy Policy, Elsevier, vol. 30(14), pages 1231-1239, November.
    4. Jijian Lian & Junling He & Fang Liu & Danjie Ran & Xiaoqun Wang & Chang Wang, 2019. "An Improved Empirical Model for Flood Discharge Atomization and Its Application to Optimize the Flip Bucket of the Nazixia Project," IJERPH, MDPI, vol. 16(3), pages 1-17, January.
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