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Numerical investigation of alleviation of undesirable effect of inter-blade vortex with air admission for a low-head Francis turbine by Long-gang Sun; Peng-cheng Guo; Luo-chang Wu is a Engineering article available to read on EtoBox.

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In order to compensate for the stochastic nature of the power grid due to the tremendous development and the integration of renewable energy resources and meet its other requirements, the hydraulic turbines are forced to operate more frequently under partial load conditions with singular and misaligned flows inevitably excited by the inter-blade vortex. This paper presents numerical investigations of the unsteady characteristics of the inter-blade vortex for a low-head model Francis turbine. The SST - k  turbulent model is used to close the unsteady Reynolds-averaged Navier-Stokes (RANS) equation. The flow structure of the inter blade vortex predicted by the numerical simulation is confirmed by experimental visualizations. It is shown that the total vortex volume in the runner sees a quasi-periodical oscillation, with significant flow separations created on the suction side of the runner blade. A counter measure by using the air admission into the water from the head cover is implemented to alleviate the undesirable effect of the inter-blade vortex. The analyses show that the development of the inter-blade vortex is significantly mitigated by the injecting air that controls and ch

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Author

Long-gang Sun; Peng-cheng Guo; Luo-chang Wu

Publisher

Springer Science and Business Media LLC

Published

2020

Language

EN

Field

Engineering (Physical Sciences)