The Effect of Rectifier Baffles on the Flow Regime of 180° Turning Pools in Vertical Slot Fishways

Xiaoming Yan, Jin Jin (), Tiegang Zheng (), Shuangke Sun, Huichao Dai, Lingquan Dai and Kai Shi
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Xiaoming Yan: College of Water & Architectural Engineering, Shihezi University, Shihezi 832003, China
Jin Jin: College of Water & Architectural Engineering, Shihezi University, Shihezi 832003, China
Tiegang Zheng: College of Water & Architectural Engineering, Shihezi University, Shihezi 832003, China
Shuangke Sun: State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China
Huichao Dai: Science and Technology Research Institute, China Three Gorges Corporation, Beijing 100038, China
Lingquan Dai: Yangtze River Eco-Environmental Engineering Research Center, China Three Gorges Corporation, Beijing 100038, China
Kai Shi: State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China

Sustainability, 2023, vol. 15, issue 13, 1-15

Abstract: To imitate the constraints of topographic conditions, turning pools with different angles, such as 90° and 180°, are set in fish passage arrangements. If the mainstream in the turning pool is close to the wall and the recirculation zone is too large, it will have an adverse effect on fish migration. Taking the 180° turning pool as an example, five types of arrangements without and with additional rectifier baffles are proposed to optimize the body shape of the turning pool. A three-dimensional numerical simulation method is used to compare and analyze the different arrangement schemes. The results show that adding rectifier baffles can adjust the flow structure in the 180° turning pool. The arrangement adding rectifier baffles at the two three-equidistant points of the 180° turning pool and tilting 15° inward outperforms others in this study. This arrangement can center the mainstream, reduce turbulent kinetic energy, significantly decrease the flow velocity along the course, downscale the recirculation zone, and decrease the overall flow velocity.

Keywords: vertical slot fishway; 180° turning pool; rectifier baffle; hydraulic characteristics (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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