Abstract
The stability properties of helical vortices are of interest for applications such as wind turbine and helicopter wakes. In the former, they contribute to the transition from an organised vortex system to a turbulent wake behind the rotor, and in the latter they may be related to the inception of the so-called Vortex Ring State of the wake of a helicopter in steep descent [2, 7]. In this work, we consider the particular instability that leads to vortex pairing, for which previous experimental [1, 4] and numerical [5] studies have shown that it plays an important role in rotor wakes. In the following, we recall a few theoretical results concerning this phenomenon, and then present experimental observations of pairing in a single helical vortex under carefully controlled conditions.
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Bolnot, H., Le Dizès, S., Leweke, T. (2014). Pairing Instability in Helical Vortices. In: Hölling, M., Peinke, J., Ivanell, S. (eds) Wind Energy - Impact of Turbulence. Research Topics in Wind Energy, vol 2. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-54696-9_4
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DOI: https://doi.org/10.1007/978-3-642-54696-9_4
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