Stability of helical tip vortices in a rotor far wake

By V. Okulov, Jens Nørkær Sørensen. Journal of Fluid Mechanics, 2007

222 citations recorded by the source corpus.

Subfields: Aerospace Engineering, Environmental Engineering

View Paper: https://www.semanticscholar.org/paper/f85f70e45d4afdbe8c6bde7381de18e60b8f6284

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Citations in the corpus

Mutual inductance instability of the tip vortices behind a wind turbine (2014, background): “The recent study of Okulov & Sørensen (2007) shows that the far wake of this model is unconditionally unstable.”
On the onset of wake meandering for an axial flow turbine in a turbulent open channel flow (2014, background): “Okulov & Sørenson (2007), for instance, carried out theoretical stability analysis of the helical tip vortices and the hub vortices behind a turbine.”
Tip-vortex instability and turbulent mixing in wind-turbine wakes (2015, background): “…research in wake stability analysis has shown that the vortical structures released by the blade tip and root mutually interact in the near wake (Okulov & Sorensen 2007); this interaction maintains the tip vortices in their stable helical pattern, which is otherwise unstable regardless of the…”
Stability analysis of the tip vortices of a wind turbine (2008, background): “Recent inviscid studies have shown that the wake resulting by Joukowski is unconditionally unstable.(2) Navier–Stokes simulations, however, have indicated that the wake might be stable under some conditions.”
Dynamic wake meandering modeling (2007, methodology): “A detailed description of the refined stability analysis based on the O-model can be found in [5].”
Large eddy simulation of propeller wake instabilities (2017, methodology): “The analysis of Okulov & Sørensen (2007) suggested that the occurrence of concentrated tip vortices is the consequence of complete roll-up of the blade trailing edge wake, which subsequently triggers instabilities.”
Mechanisms of evolution of the propeller wake in the transition and far fields (2011, methodology): “…analysis of helical tip vortices pointed out that the stability of a rotor wake is the consequence of the mutual interaction among † Email address for correspondence: m.felli@insean.it the tip and hub vortices and the helical filaments trailing from each blade (Lugt 1996; Okulov & Sørensen 2007).”
On the wake dynamics of a propeller operating in drift (2014, background): “In fact, as emphasized in Okulov & Sorensen (2007), the earliest analytical theories (developed for helicopter rotors) synthesized the rotor wake with tip vortices and hub vortex alone; this wake configuration is unconditionally unstable, whereas the presence of the complete vortex sheet trailed…”
Wind-Turbine and Wind-Farm Flows: A Review (2019, background): “…(e.g., Felli et al. 2011; Iungo et al. 2013a; Viola et al. 2014; Ashton et al. 2016) have shown that the hub vortex is characterized by a singlehelix counter-winding instability, which interacts with the tip-vortex layer (e.g., Okulov and Sørensen 2007; Kang et al. 2014; Howard et al. 2015).”
Effects of Thermal Stability and Incoming Boundary-Layer Flow Characteristics on Wind-Turbine Wakes: A Wind-Tunnel Study (2010, background): “Okulov and Sorensen (2007 ) h ave shown also that, although it is not possible to match the Reynolds number of real wind turbines, it is possible to reproduce the basic characteristics of the wakes (e.g.”