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• W3167992013 abstract "The decelerated swirling flow in the discharge cone of Francis turbines operated at partial discharge, far from the best efficiency point, develops self-induced instabilities featuring a precessing helical vortex (so-called vortex rope) which hinders the stable and safe turbine operation. This is an intrinsic characteristic of the swirl exiting the Francis runner, which at part load has a relatively large residual flux of moment of momentum as well as an imbalanced specific hydraulic energy with an excess near the band. We address in this paper the question of how one should alter this swirling flow in order to mitigate further instabilities in the discharge cone. In doing so, we consider an actuator disk located in the upstream part of the discharge cone that model a runaway runner which alter the hub-to-shroud angular momentum and specific head distributions without altering the turbine operating point. However, such a runaway runner provides a swirl stabilisation further downstream thereby effectively mitigating the vortex rope." @default.
• W3167992013 created "2021-06-22" @default.
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• W3167992013 date "2021-06-01" @default.
• W3167992013 modified "2023-09-25" @default.
• W3167992013 title "Stabilisation of the swirl exiting a Francis runner far from the best efficiency point" @default.
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• W3167992013 doi "https://doi.org/10.1088/1755-1315/774/1/012113" @default.
• W3167992013 hasPublicationYear "2021" @default.
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