Jet trajectory of flow-separating slot-type flip bucket

Author:

Tian Ran1,Wu Jianhua1,Xu Zhun2,Ma Fei1

Affiliation:

1. College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China

2. Nanjing Hydraulic Research Institute, Nanjing 210098, China

Abstract

Abstract A flip bucket is a common element used to dissipate energy for release works. For the purpose of avoiding excessive scour and flow choking, the slot-type flip bucket was developed. In this paper, a flow-separating slot-type flip bucket (FSSFB) is proposed on this basis, which can divide the approach flow into three branches by dividing walls, and thus generate two small, completely separated jets resulting in better energy dissipation performance and reduced scour. Based on model tests, the jet trajectory of the FSSFB is investigated. Considering the local head loss from the flow passing the dividing walls, the take-off velocity is amended for calculating the jet trajectory using the projectile method. Based on fitting analysis, the head loss coefficient is a function of the relative width b/B, the relative angle θ/β of the slot and the Froude number Fro of the approach flow. Finally, an empirical relationship for the head loss coefficient is provided, and the error in the calculation of jet trajectory is less than 10% for the FSSFB.

Funder

National Natural Science Foundation of China

Publisher

IWA Publishing

Subject

Water Science and Technology

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1. TDG generation in a ski-jump spillway with a fully or partial-flip bucket;Journal of Environmental Management;2024-02

2. Hydraulic Investigation of Converged Ski-Jump Bucket in Presence of Dividing Wall;Iranian Journal of Science and Technology, Transactions of Civil Engineering;2022-04-06

3. Choking Flow Characteristics of the Rectangular Slot-Type Flip Bucket;Experimental Techniques;2022-02-23

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