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WER-23: Reflection plane test of control devices on a thick airfoil at high angles of attack
Snyder, Melvin H. Wentz, W. H. Ahmed, A.
Snyder, Melvin H.
Wentz, W. H.
Ahmed, A.
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WER 23.pdf
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Original Date
Digitization Date
Issue Date
1983-09
Type
Technical report
Genre
Keywords
Turbines,Aerodynamics,Aerofoils
Subjects (LCSH)
Citation
M.H. Snyder, W.H. Wentz, A. Ahmed. Reflection plane test of control devices on a thick airfoil at high angles of attack. Wind Energy Report no.23.Wichita State University. Center for Energy Studies, 1983, 109 p.
Abstract
The purpose of the tests was to evaluate a series of
control devices proposed as aerodynamic controls for wind
turbines. This application imposes airfoil design
constraints of large thickness and high angles of attack.
Primary purpose of control is to slow or to stop the
turning of a wind turbine rotor, requiring negative torque
to be produced over much of the rotor span. For an
untwisted, zero pitch, rotor this requirement means that
negative CS must be produced at most angles of attack.
Reflection-plane tests of an NACA 23024 airfoil were
conducted in the WSU 7 x 10 ft. wind tunnel. The airfoil
was equipped with a series of devices, including spoilers
and deflector-ailerons. Force results are presented in
terms of leading-edge suction force $(C_S)$, normal force
(CN), and pitching moment (CM), as well as wind-axis forces
of lift (CL) and drag (C0).
The results show that it is possible to design
retractable deflector-aileron control surfaces which will
produce, when extended, negative leading-edge suction over
wide ranges of angle of attack. Best angle of deflection
of the deflector-ailerons tested is 90°. Increasing
Reynolds number tends to increase values of CS. A gap at
the surface hingeline permitting flow of air between upper
and lower surfaces minimizes Reynolds number effect on $C_S.$
Table of Contents
Description
In the public domain. Date for general release: September 1985
Publisher
Wichita State University. Center for Energy Studies
Journal
Book Title
Series
Wind Energy Report;
;no.23rev
;no.23rev