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WER-31: Effect of spanwise blowing on separation and pressure distributions on a thick wing at high angle of attack
Wentz, W. H. Snyder, Melvin H. Huffman, R. Adlib-Yaghmaee, F.
Wentz, W. H.
Snyder, Melvin H.
Huffman, R.
Adlib-Yaghmaee, F.
Citations
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WER 31.pdf
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Location
Time Period
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Original Date
Digitization Date
Issue Date
1985-07
Type
Technical report
Genre
Keywords
Turbines,Aerodynamics,Aerofoils
Subjects (LCSH)
Citation
W.H. Wentz, M.H. Snyder, R. Huffman, and F. Adib-Yaghmaee. Effect of spanwise blowing on separation and pressure distributions on a thick wing at high angle of attack. Wind Energy Report no.31.Wichita State University. Center for Energy Studies, 1985, 101 p.
Abstract
Pressure measurements were made on a section of a
full-scale wind turbine blade to investigate the
post-separated flow condition at high angles of attack.
Airfoil sections on the blade are approximately NACA 23027 to
23030. The tests were conducted in the WSU 7 x 10 ft. Walter
Beech Wind Tunnel, at chord Reynolds numbers of $0.5 x 10^6$
To $2.0 x 10^6$, which correspond to Mach numbers of 0.03 to 0.12
respectively. The investigation was conducted by taking
surface pressure data and photographs of fluorescent oil flow
patterns. Spanwise blowing was provided to simulate possible
effects of radial flow on a rotating blade. Blowing momentum
coeffi9ients ranged from 0.0 to 0.54, and angles of attack
ranged from 10 to 30 degrees. Pressure distributions were
integrated to obtain pressure forces.
Results show that separation begins at the trailing edge
and moves forward progressively as the angle of attack is
increased. Spanwise blowing is most effective at angles near
stalling. Blowing delays the decrease in post-stall lift,
thereby retaining positive axial force to higher angles of
attack. Values of Cμ between 0.25 and 0.35 are optimum in
terms of increasing lift coefficient. The visualization
techniques show that the blowing does not substantially
change the separation line location. It is hypothesized that
the blowing reduces the size of the separation bubble,
resulting in the pressure characteristics observed.
Table of Contents
Description
Publisher
Wichita State University. Center for Energy Studies
Journal
Book Title
Series
Wind Energy Report;
;no.31
;no.31