Structural Engineering and Mechanics

Techno-Press (테크노프레스)
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Flat-bottomed design philosophy of Y-typed bifurcations in hydropower stations

  • Wang, Yang (State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University) ;
  • Shi, Chang-zheng (State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University) ;
  • Wu, He-gao (State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University) ;
  • Zhang, Qi-ling (Changjiang River Scientific Research Institute) ;
  • Su, Kai (State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University)
  • Received : 2015.03.12
  • Accepted : 2016.02.04
  • Published : 2016.03.25
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Abstract

The drainage problem in bifurcations causes pecuniary losses when hydropower stations are undergoing periodic overhaul. A new design philosophy for Y-typed bifurcations that are flat-bottomed is proposed. The bottoms of all pipe sections are located at the same level, making drainage due to gravity possible and shortening the draining time. All fundamental curves were determined, and contrastive analysis with a crescent-rib reinforced bifurcation in an actual project was conducted. Feasibility demonstrations were researched including structural characteristics based on finite element modeling and hydraulic characteristics based on computational fluid dynamics. The new bifurcation provided a well-balanced shape and reasonable stress state. It did not worsen the flow characteristics, and the head loss was considered acceptable. The proposed Y-typed bifurcation was shown to be suitable for pumped storage power stations.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China

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