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Published in:
Flow Scales in Cross-Flow Turbines Read chapter Read first chapter

2015 | OriginalPaper | Chapter

4. Vertical-Axis Wind Turbine Start-Up Modelled with a High-Order Numerical Solver

Authors : J. M. Rainbird, E. Ferrer, J. Peiro, J. M. R. Graham

Published in: CFD for Wind and Tidal Offshore Turbines

Publisher: Springer International Publishing

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Abstract

Vertical axis wind turbine (VAWT) start-up is a highly non-linear process, with turbines experiencing a long idling period of low acceleration before a sudden increase in rotational velocity to a final equilibrium state. The physics of start-up behaviour is not well understood, with some analyses showing VAWTs to be incapable of self-start, in spite of experimental and field evidence to the contrary. This study attempts to assess the impact of blade–wake interactions on start-up behaviour.
A high-order discontinuous Galerkin (DG) solver was used to simulate the flow around a VAWT, with experimentally obtained acceleration applied to the turbine, forcing it from standing to a tip-speed ratio (TSR) of 2 in a typically non-linear pattern. Additionally, the DG code was run with a constant TSR of 1, a TSR at which blade–wake interactions are known to occur. A blade-element momentum (BEM) method was used to provide an additional simulation of the turbine at this speed. Since the DG code captures blade–wake interactions while the BEM does not, a comparison of the outputs of the two was made to assess the impact of the interactions on blade forces.

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previous chapter A Moving Least Squares-Based High-Order-Preserving Sliding Mesh Technique with No Intersections
next chapter Large-Eddy Simulation of a Vertical Axis Tidal Turbine Using an Immersed Boundary Method
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Metadata
Title
Vertical-Axis Wind Turbine Start-Up Modelled with a High-Order Numerical Solver
Authors
J. M. Rainbird
E. Ferrer
J. Peiro
J. M. R. Graham
Copyright Year
2015
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_4