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Structural Engineering and Mechanics
  Volume 57, Number 6, March25 2016 , pages 1085-1105
DOI: https://doi.org/10.12989/sem.2016.57.6.1085
 


Flat-bottomed design philosophy of Y-typed bifurcations in hydropower stations
Yang Wang ,Chang-zheng Shi , He-gao Wu, Qi-ling Zhang and Kai Su

 
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.
 
Key Words
    hydropower; bifurcation; flat-bottomed; design philosophy; finite element modeling; computational fluid dynamics
 
Address
Yang Wang, Chang-zheng Shi and He-gao Wu: State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, Hubei 430072, China
Qi-ling Zhang: Changjiang River Scientific Research Institute, Wuhan, Hubei 430010, China
Kai Su: State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, Hubei 430072, China
 

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