National Renewable Energy Laboratory, 1996. - 83 pages.
This study focuses on the use of vortex generators (VGs) for
performance augmentation of the stall-regulated AWT-26 wind
turbine. The goal was to design a VG array which would increase
annual energy production (API1) by increasing power output at
moderate wind speeds, without adversely affecting the loads or
stall-regulation performance of the turbine.
Wind tunnel experiments were conducted at the University of
Washington to evaluate the effect of VGs on the AWT-26 blade, which
is lofted from National Renewable Energy Laboratory (NREL) S-series
airfoils. Based on wind-tunnel results and analysis, a VG array was
designed and then tested on the AWT-26 prototype, designated Pi.
Performance and loads data were measured for PI, both with and
without VGs installed. The turbine performance with VGs met most of
the design requirements; power output was increased at moderate
wind speeds with a negligible effect on peak power. However, VG
drag penalties caused a toss in power output for low wind speeds,
such that performance with VGs resulted in a net decrease in AEP
for sites having annual average wind speeds up to 8.5 m/s.
While the present work did not lead to improved AEP for the AWT-26
turbine, it does provide insight into performance augmentation of
wind turbines with VGs. The safe design of a VG array for a stall
-regulated turbine has been demonstrated, and several issues
involving optimal performance with VGs have been identified and
addressed.
Griffin D. Investigations of Vortex Generators For Augmentation of Wind Turbine Power Performance
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