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Vortex Dynamics in the Wake of Three Generic Types of Free-Stream Turbines

[+] Author and Article Information
Matthieu Boudreau

Laboratoire de Mécanique des Fluides Numérique, Department of Mechanical Engineering, Laval University, Quebec City, Quebec, G1V 0A6, Canada
matthieu.boudreau.1@ulaval.ca

Guy Dumas

Laboratoire de Mécanique des Fluides Numérique, Department of Mechanical Engineering, Laval University, Quebec City, Quebec, G1V 0A6, Canada
gdumas@gmc.ulaval.ca

1Corresponding author.

ASME doi:10.1115/1.4037974 History: Received July 21, 2016; Revised August 14, 2017

Abstract

An analysis of the vortex dynamics in the wake of three different free-stream 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 cross-flow 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 $10^7$. Three-dimensional 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.

Copyright (c) 2017 by ASME
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