This paper exploits blade surface pressure data acquired by testing a three-bladed upwind turbine operating in the field. Data were collected for a rotor blade at spanwise 0.7R with the rotor disc at zero yaw. Then, for the same blade, surface pressure data were acquired by testing in a wind tunnel. Analyses compared aerodynamic forces and surface pressure distributions under field conditions against analogous baseline data acquired from the wind tunnel data. The results show that aerodynamic performance of the section 70%, for local angle of attack below static stall, is similar for free stream and wind tunnel conditions and resemblances those commonly observed on two-dimensional aerofoils near stall. For post-stall flow, it is presumed that the exhibited differences are attributes of the differences on the Reynolds numbers at which the experiments were conducted.

Keywords:
wind turbines, blades, wind tunnels, aerodynamics, pressure measurement
Topics:
Blades, Pressure, Wind tunnels, Wind turbines
1.
Madsen
,
H. A.
, and
Christensen
,
H.
,
1990
, “
On the relative importance of rotational, unsteady and three-dimensional effects on the HAWT rotor aerodynamics
,”
Wind Eng.
,
14-6
, pp.
405
–
415
.
2.
Huyer
,
S. A.
,
Simms
,
D. A.
, and
Robinson
,
M. C.
,
1996
, “
Unsteady aerodynamics associated with a horizontal-axis wind turbine
,”
AIAA J.
,
34
, No.
10
, pp.
1410
–
1419
.
3.
Robinson, M. C., Simms, D. A., Hand., M. M., and Schreck., S. J, 1999, “Horizontal axis wind turbine aerodynamics: Three-dimensional, unsteady, and separated flow influences,” in Proc. 3rd ASME/JSME joint fluid engineering conference, San Francisco, CA, USA.
4.
Schreck
,
S. J.
,
Robinson
,
M. C.
,
Simms
,
D. A.
, and
Hand.
,
M. M.
,
2001
, “
Blade dynamic stall vortex kinematics for a horizontal axis wind turbine in yawed conditions
,”
ASME J. Sol. Energy Eng.
,
123
, pp.
272
–
281
.
5.
Schepers, J. G., Brand, A. J., Bruining, A., Graham, J. M. R., Hand, M. M., Infield, D. G., Madsen, H. A., Paynter, R. H. J., and Simms, D. A., 1997, “Final report of IEA Annex XIV: Field rotor aerodynamics,” ECN-C-97-027, Petten, Netherlands.
6.
Schepers, J. G., Brand, A., Madsen, H., Stefanatos, N., Simms, D., Hand, M., Bruining, A., van Rooij, R., Shimizu, Y., Maeda, T., and Graham, M., 2001, “IEA Annex XIV/XVIII, field rotor aerodynamics,” Proc. of EWEC, Copenhagen, Denmark, pp. 457–461.
7.
Schepers, J. G., 1995, “Angle of attack in aerodynamic field measurements on wind turbines,” ECN Technical Report.
8.
Schreck
,
S.
, and
Robinson
,
M.
,
2002
, “
Rotational augmentation of horizontal axis wind turbine blade aerodynamic response
,”
Wind Eng.
,
5
, pp.
133
–
150
.
9.
Schreck
,
S.
, and
Robinson
,
M.
,
2003
, “
Boundary layer state and flow field structure underlying rotational augmentation of blade aerodynamic response
,”
ASME J. Sol. Energy Eng.
,
125
, pp.
448
–
456
.
10.
Maeda, T., Kamada, Y., Shimizu, Y., Kakazu, S., Idomoto, T., Bruining, A., and van Rooij, R., 1999, “Unsteady pressure distribution on rotating blade of Mie university open air rotor research facility,” Proc. EWEC, Nice, France, pp. 121–124.
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