Modelling the aerodynamics of vertical-axis wind turbines in unsteady wind conditions
Article first published online: 24 FEB 2012
Copyright © 2012 John Wiley & Sons, Ltd.
Volume 16, Issue 1, pages 91–107, January 2013
How to Cite
Scheurich, F. and Brown, R. E. (2013), Modelling the aerodynamics of vertical-axis wind turbines in unsteady wind conditions. Wind Energ., 16: 91–107. doi: 10.1002/we.532
- Issue published online: 22 JAN 2013
- Article first published online: 24 FEB 2012
- Manuscript Accepted: 20 SEP 2011
- Manuscript Revised: 18 SEP 2011
- Manuscript Received: 11 MAR 2011
- vertical-axis wind turbine;
- unsteady wind conditions;
- numerical simulation;
- vorticity transport model
Most numerical and experimental studies of the performance of vertical-axis wind turbines have been conducted with the rotors in steady, and thus somewhat artificial, wind conditions—with the result that turbine aerodynamics, under varying wind conditions, are still poorly understood. The vorticity transport model has been used to investigate the aerodynamic performance and wake dynamics, both in steady and unsteady wind conditions, of three different vertical-axis wind turbines: one with a straight-bladed configuration, another with a curved-bladed configuration and another with a helically twisted configuration. The turbines with non-twisted blades are shown to be somewhat less efficient than the turbine with helically twisted blades when the rotors are operated at constant rotational speed in unsteady wind conditions. In steady wind conditions, the power coefficients that are produced by both the straight-bladed and curved-bladed turbines vary considerably within one rotor revolution because of the continuously varying angle of attack on the blades and, thus, the inherent unsteadiness in the blade aerodynamic loading. These variations are much larger, and thus far more significant, than those that are induced by the unsteadiness in the wind conditions. Copyright © 2012 John Wiley & Sons, Ltd.