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Aerodynamics of Vertical-Axis Wind Turbines: Assessment of Accepted Wind Tunnel Blockage Practice
48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition
  • Ian Ross, University of Dayton
  • Aaron Altman, University of Dayton
  • Dan Bowman, University of Dayton
  • Tom Mooney, University of Dayton
  • Doug Bogart, Twenty First Century Energy
Document Type
Conference Paper
Publication Date
1-1-2010
Abstract

An ongoing investigation into wake and solid blockage effects of vertical axis wind turbines (VAWTs) in closed test-section wind tunnel testing is described. Static wall pressures have been used to derive velocity increments along a wind tunnel test-section which in turn are applied to provide evidence of wake interference characteristics of rotating bodies interacting within this spatially restricted domain.

Vertical-axis wind turbines present a unique aerodynamic obstruction in wind tunnel testing whose blockage effects have not yet been extensively investigated. The flowfield surrounding these wind turbines is asymmetric, periodic, unsteady, separated and highly turbulent. Static pressure measurements are taken along a test-section sidewall to provide a pressure signature of the test models under varying rotor tip-speed ratios (freestream conditions and model RPM's). Wake characteristics and VAWT performance produced by the same vertical-axis wind turbine concept tested at different physical scales and in two different wind tunnels are investigated in an attempt to provide some guidance on the scaling of the combined effects on blockage.

This investigation provides evidence of the effects of large wall interactions and wake propagation caused by these models at well below generally accepted standard blockage figures.

ISBN/ISSN
978-1-60086-959-4
Comments

Permission documentation is on file.

Publisher
American Institute of Aeronautics and Astronautics
Place of Publication
Orlando, FL
Citation Information
Ian Ross, Aaron Altman, Dan Bowman, Tom Mooney, et al.. "Aerodynamics of Vertical-Axis Wind Turbines: Assessment of Accepted Wind Tunnel Blockage Practice" 48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition (2010)
Available at: http://works.bepress.com/aaron-altman/12/