Journal of Changjiang River Scientific Research Institute ›› 2025, Vol. 42 ›› Issue (1): 120-128.DOI: 10.11988/ckyyb.20230934

• Hydraulics • Previous Articles     Next Articles

Hydraulic Characteristics of Chute Block-Trapezoidal Block Joint Dissipator

ZHAO Qian1,2(), MU Zhen-wei1,2(), ZHOU Kai1,2, GAO Shang3, ZHANG Hong-hong1,2   

  1. 1 College of Hydraulic and Civil Engineering, Xinjiang Agricultural University, Urumqi 830052, China
    2 Xinjiang Key Laboratory of Hydraulic Engineering Security and Water Disasters Prevention, Urumqi 830052,China
    3 Water Conservancy and Hydropower Survey Design and Research Institute of Xinjiang Uygur Autonomous Region, Urumqi 830000, China
  • Received:2023-08-28 Revised:2023-12-12 Published:2025-01-01 Online:2025-01-01
  • Contact: MU Zhen-wei

Abstract:

This study aims to address the turbulent flow patterns and significant water surface fluctuations in the original stilling basin, which lead to the formation of repelled downstream hydraulic jumps and subsequent scouring damage to the apron slab. To mitigate these problems, a combined chute block and trapezoidal block energy dissipator is employed, and the hydraulic characteristics of this dissipator are investigated. Physical model testing and numerical simulation techniques are combined to study the energy dissipation behavior under various flow rates. The energy conversion processes within the flow are analyzed, and flow velocity reduction ratios are calculated to assess the effectiveness of the dissipator. Findings indicate that, for the chute block-trapezoidal block joint dissipator with double rows of trapezoidal blocks arranged in a staggered manner, the velocity reduction ratios at three different flow rates are 60.00%, 75.34%, and 73.75%, respectively. Compared to the original stilling basin, this arrangement reduces the length of the hydraulic jump by 11.29%, 14.17%, and 10.22% across the respective flow rates. The energy dissipation mechanism is categorized into four distinct zones: the flow contraction and diversion area, the hydraulic jump swirl area, the vortex areas on both sides, and the post-jump mainstream area. The findings provide a valuable reference for the design of joint dissipators and the optimization of stilling basins.

Key words: stilling basin, hydraulic characteristics, hydraulic jump, chute block - trapezoidal block, energy dissipation

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