Author(s): Jing Dong; W. Z. Zhou; S. L. Han; K. J. Ren; Z. B. Jiang; Z. B. Cheng; X. H. Li; Z. X. Wang

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Keywords: side inlet/outlet; planar turning tunnel; hydraulic characteristics; numerical simulation

Abstract: In order to achieve the "double carbon" goal, energy transformation has become the future trend. Among many energystorage methods, pumped-storage station has become a kind of energy storage method due to its obvious advantages. Considering the constraints of geological conditions or comprehensive costs, planar turning water conveyance tunnels are oftenutilized to connect the side inlet/outlet with the generator unit in the design of pumped storage power stations. However, due tothe curvature effect, Dean vortex are likely to appear in the turning tunnel, which may affect the internal hydrauliccharacteristics of the inlet/outlet. This paper focuses on the side inlet/outlet widely applied in the pumped-storage project, anduses numerical simulation, supplemented by experiment, to investigate the flow distribution of the inlet/outlet connected toaplanar turning tunnel. The results show that, compared with the straight tunnel, the turning tunnel will result in uneven flowdistribution at the inlet/outlet. Additionally, the influence of the design of the diversion pier on the flow distribution of theinlet/outlet was explored. It can be found that using arc-shaped diversion pier heads, eliminating the folding point of diversionpier’s profile, and adjusting the pier spacing can all improve the unevenness of flow distribution at each orifice. Among them, adjusting the spacing of diversion piers shows the best effect on improving the diversion ratio.The research results may providereference for the design of side inlet/outlet of pumped-storage power plants connected to a planar turning tunnel

DOI: https://doi.org/10.3929/ethz-b-000675921

Year: 2024