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Tip vortex instability triggered by rotor asymmetry for accelerated wake recovery

Abstract

The breakdown of tip vortices in the wake of a wind turbine is the crucial first step of wake mixing and recovery. Capitalizing on inherent instabilities in the vortex system to promote interaction between adjacent vortices can accelerate this breakdown process. One way to trigger vortex instability is to introduce an asymmetry to the rotor by modifying one or two of the blades. The current study uses water channel experiments and simulations to investigate the effects of different types of rotor asymmetry on the wake. Results show that rotor asymmetry successfully triggers vortex instabilities, though some types of asymmetry are more effective than others. These findings suggest rotor asymmetry could be used as a type of passive flow control to mitigate the detrimental effects of wakes on downstream turbines in a wind farm.
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Dates and versions

hal-03872917 , version 1 (26-11-2022)

Identifiers

  • HAL Id : hal-03872917 , version 1

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Aliza Abraham, Thomas Leweke, Néstor Ramos-García, Jens Nørkær Sørensen. Tip vortex instability triggered by rotor asymmetry for accelerated wake recovery. 2022 NAWEA/WindTech Conference, Sep 2022, Newark (DE), United States. ⟨hal-03872917⟩
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