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WER-37 rev: Performance and aerodynamic braking of a horizontal-axis wind turbine from small-scale wind tunnel tests
Cao, Hoa V. Wentz, W.H.
Cao, Hoa V.
Wentz, W.H.
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WER-37rev
Adobe PDF, 11.86 MB
Authors
Cao, Hoa V.
Wentz, W.H.
Wentz, W.H.
Other Names
Location
Time Period
Advisors
Original Date
Digitization Date
Issue Date
1985-07
Type
Technical report
Genre
Keywords
Windmills-- testing,Aerodynamics,Wind tunnels
Subjects (LCSH)
Citation
Hoa V. Cao, W.H. Wentz. Performance and aerodynamic braking of a horizontal-axis wind turbine from small-scale wind tunnel tests. Wind Energy Report no.37rev. Wichita State University. Center for Energy Studies, 1985, 116 p.
Abstract
Wind tunnel tests of three 20-inch diameter,
zero-twist, zero-pitch wind turbine rotor models have been
conducted in the WSU 7' x 10 1 wind tunnel to determine the
performance of such rotors with NACA 23024 airfoil and with
NACA 64 3-621 airfoil sections. Aerodynamic braking
characteristics of a 30% span, 30% chord vented aileron
configuration were measured on the NACA 23024 rotor.
Surface flow patterns were observed using fluorescent
mini-tufts attached to the suction side of the rotor
blades.
Experimental results with and without aileron are
compared to predictions using airfoil section data and a
momentum performance code. Results of the performance
studies show that the 64
3
-621 rotor produces higher peak
power than the 23024 rotor for a given rotor RPM.
Analytical studies, however, indicate that the 23024 should
produce higher power. Transition strip experiments show
that the 23024 rotor is much more sensitive to roughness
than the 643 -621 rotor. These trends agree with analytical
predictions. Results of the aileron tests show that this
aileron, when deflected, produces negative torque at all
positive tip-speed ratios. In free-wheeling coastdowns the
rotor blade stopped, then rotated backward at a tip-speed
ratio of -0.6. Results of the tuft studies indicate that
substantial spanwise flow develops as blade stall occurs at
low tip-speed ratios.
Table of Contents
Description
In the public domain.. Prepared for NASA-Lewis Research Center
Grant No. NSG-3277. Date of General Release: July, 1987
Publisher
Wichita State University. Center for Energy Studies
Journal
Book Title
Series
Wind Energy Report;no.37 rev