An analysis of the vortex dynamics in the wake of three different freestream turbine concepts is conducted to gain a better understanding of the main processes affecting the energy recovery in their wakes. The turbine technologies considered are the axial-flow turbine (AFT), the crossflow turbine (CFT), also known as the H-Darrieus turbine, and the oscillating-foil turbine (OFT). The analysis is performed on single turbines facing a uniform oncoming flow and operating near their optimal efficiency conditions at a Reynolds number of 107. Three-dimensional (3D) delayed detached-eddy simulations (DDES) are carried out using a commercial finite volume Navier–Stokes solver. It is found that the wake dynamics of the AFT is significantly affected by the triggering of an instability, while that of the CFT and the OFT are mainly governed by the mean flow field stemming from the tip vortices' induction.
Vortex Dynamics in the Wake of Three Generic Types of Freestream Turbines
Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received July 21, 2016; final manuscript received August 14, 2017; published online October 24, 2017. Assoc. Editor: Olivier Coutier-Delgosha.
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Boudreau, M., and Dumas, G. (October 24, 2017). "Vortex Dynamics in the Wake of Three Generic Types of Freestream Turbines." ASME. J. Fluids Eng. February 2018; 140(2): 021106. https://doi.org/10.1115/1.4037974
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