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ECN publicatie:
Titel:
Quasi-steady aerodynamic coefficients at a large range of angles of attack
 
Auteur(s):
Brand, A.J.
 
Gepubliceerd door: Publicatie datum:
ECN 1996
 
ECN publicatienummer: Publicatie type:
ECN-C--95-059 ECN rapport
 
Aantal pagina's: Volledige tekst:
62  Niet beschikbaar.

Samenvatting:
Aerodynamic data measured at a non-rotating rotor blade in thefree-stream wind was analysed with '2D (un)steady' analysis techniques. Time series of the normal force coefficient cn and the angle of attack alpha (small, medium and large average incidence) were analysed by identification cn(alpha) loops, conditionally averaging against dalpha/dt correlating cn(t) to alpha(t), and determining the parameters of a simple unsteady lift model. It appeared that applying these '2D unsteady' techniques to the '3D unsteady' data did not give useful results. Data obtained at -180"ol and cd. Comparing these cl's and cd's to reference values revealed large differences (cl: about 25%; cd: up to 100%) between the averaged '3D unsteady' and the '2D steady' data. Taken together the failure of the techniques and the large difference suggest that field data must not be used for the tuning of model parameters. 21 figs, 10 tabs, 15 refs.


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