Analysis of Unsteady Vortex Flow in Francis Hydro-Turbine
This paper uses standard k-εmodel to conduct three-dimensional unsteady numerical simulation of the entire flow channel of a hydroelectric power plant turbine,and studies the influence of internal blade passage vortices on the formation and evolution of tailwater vortex strips.By analyzing the internal flow field of the impeller and tailwater pipe under two different flow conditions,this study explores and reveals the growth,collapse,and mutual interference evolution mechanisms of blade channel vortices and tailwater vortex bands.The research results indicate that by simulating the entire flow field inside the water turbine,the formation and evolution characteristics of the internal three-dimensional vortex structure can be intuitively and dynamically displayed.Moreover,by observing the blade passage vortex inside the impeller and the tailwater vortex strip inside the tailwater pipe,the mutual interference process between the two can be clearly displayed.Therefore,this numerical simulation has certain reference value for exploring the safe operation of water turbine units.
Francis hydro-turbineunsteady flowblade passage vortextailwater vortex
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