Author(s): Fangfang Wang; Manman Kuang; Jianying Xing; Shi Zhang; Shiyong Wu; Rui Wen; Ang Gao

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Keywords: Mild-slope chutes; Aeration facility; Aeration cavity; Backwater; DFS

Abstract: Aeration facilities are effective in protecting discharge chutes from cavitation damage under high-speed flows, and an effective and stable aeration cavity is essential for the proper operation. However, flows in mild-slope chute present unique aeration characteristics, such as more uneven velocity distribution, weaker entrainment capacity, easier cavity backwater, which exacerbate cavitation damage risk. By experimental comparisons and theoretical analysis, a kind combined aerator of "Dovetail ramp + Flat (mild) slope + Steep slope" (DFS) is proposed to solve the aeration problem for mild-slope chutes. The DFS aerator features a stable cavity, sufficient ventilation, backflow elimination, and strong adaptability to various inflow conditions. the dovetail ramp is found to have superior flow aeration characteristics compared to three-dimensional irregular buckets. It is characterized by a stable cavity, sufficient ventilation, elimination of cavity water accumulation, and strong adaptability to varying flow conditions. The two-dimensional swallowtail ramp demonstrates superior aeration characteristics as its simple structures, compared to the three-dimensional “V” type ramp and the two-dimensional continuous ramps. This aerator can effectively solve the aeration problems in mild-slope and low Froude number (Fr) flows.

DOI: https://doi.org/10.64697/978-90-835589-7-4_41WC-P1960-cd

Year: 2025