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23 November 2022 Correlation research between Francis runner outlet flow and draft tube vortex
Xiaohang Wang, Minjia Chen, Na Yan, Guojun Zhu
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Proceedings Volume 12302, Seventh International Conference on Electromechanical Control Technology and Transportation (ICECTT 2022); 1230206 (2022) https://doi.org/10.1117/12.2645837
Event: Seventh International Conference on Electromechanical Control Technology and Transportation (ICECTT 2022), 2022, Guangzhou, China
Abstract
The helical vortex is formed in the draft tube of Francis turbine under partial load condition, which has an adverse effect on the safe and stable operation of the turbine. In order to study the correlation between the flow field at the runner outlet and the variation of vortex in the draft tube, the influence of the circumferential velocity and meridional velocity at the runner outlet on the vertex shape is analyzed through the simulation and experiment method. The results show that the meridional velocity at runner outlet has positive correlation with the diameter of the vortex. The vortex volume decreases with the decrease of the low meridional velocity region at the runner outlet. Decreasing the standard deviation of the circumferential velocity at the runner outlet is conductive to decrease the pressure fluctuation amplitude and its hydraulic loss in the draft tube.
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Xiaohang Wang, Minjia Chen, Na Yan, and Guojun Zhu "Correlation research between Francis runner outlet flow and draft tube vortex", Proc. SPIE 12302, Seventh International Conference on Electromechanical Control Technology and Transportation (ICECTT 2022), 1230206 (23 November 2022); https://doi.org/10.1117/12.2645837
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KEYWORDS
Numerical simulations
Computer simulations
Analytical research
Hydroelectric energy
Prototyping
Turbulence
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