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2015 | OriginalPaper | Chapter

1. Flow Scales in Cross-Flow Turbines

Authors : Esteban Ferrer, Soledad Le Clainche

Published in: CFD for Wind and Tidal Offshore Turbines

Publisher: Springer International Publishing

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Abstract

This work presents analytical estimates for various flow scales encountered in cross-flow turbines (i.e. Darrieus type or vertical axis) for renewable energy generation (both wind and tidal). These estimates enable the exploration of spatial or temporal interactions between flow phenomena and provide quantitative and qualitative bounds of the three main flow phenomena: the foil scale, the vortex scale and wake scale. Finally using the scale analysis, we show using an illustrative example how high order computational methods prove beneficial when solving the flow physics involved in cross-flow turbines.

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next chapter Numerical Study of 2D Vertical Axis Wind and Tidal Turbines with a Degree-Adaptive Hybridizable Discontinuous Galerkin Method

Airfoil aerodynamics and hydrofoil hydrodynamics are equivalent nomenclatures for foils operating in air or water environments. Since this work encompasses both wind and tidal turbine applications, from this point onwards, “foils” will denote either “airfoils” or “hydrofoils”. In addition, the term “aerodynamic” can always be replaced by “hydrodynamic” in this work.

β < 1 for unblocked cases but may exceed 1 if blockage leads to accelerated flow through the turbine.

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Title: Flow Scales in Cross-Flow Turbines
Authors: Esteban Ferrer
Soledad Le Clainche
Publisher: Springer International Publishing
Book: CFD for Wind and Tidal Offshore Turbines
Print ISBN: 978-3-319-16201-0

Electronic ISBN: 978-3-319-16202-7

Copyright Year: 2015
DOI: https://doi.org/10.1007/978-3-319-16202-7_1