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Title:
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Final report of IEA Annex XIV: field rotor aerodynamics
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Author(s):
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Published by:
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Publication date:
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ECN
Solar Energy
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1997
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ECN report number:
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Document type:
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ECN-C--97-027
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ECN publication
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Number of pages:
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Full text:
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287
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Download PDF
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Abstract:
The objective of the title Annex was defined as the coordination of fullscale aerodynamic test programs on wind turbines, in order to acquire the
maximum of experimental data at minimum costs. In these full scale
aerodynamic test programs local aerodynamic quantities (forces, inflow
velocities, inflow angles) are measured at several radial positions along the
blade. The supply of local aerodynamic data, is a major step forward in
understanding the very complicated aerodynamic behaviour of a wind turbine.
In conventional test programs only blade (or rotor) quantities are measured.
Usually these quantities are integrated over the rotor blade(s) and they are
not only influenced by aerodynamic effects, but also by mass effects. Then
the local aerodynamic properties of the blade can only be derived indirectly,
introducing an uncertainty. A total of five full scale aerodynamic test
programs were coordinated. The programs were carried out by Delft University
of Technology, Netherlands; Imperial College, IC and Rutherford Appleton
Laboratory, United Kingdom; Netherlands Energy Research Foundation,
Netherlands (Operating Agent); National Renewable Energy Laboratory, USA; and
RISOe National Laboratory, Denmark. In order to create the database, a joint
measurement program was agreed upon. It was agreed that measurements should
be supplied in which the angle of attack ranges from negative values to deep
stall values. Also measurements at yaw misalignment and at stand still have
been supplied. The data file formats and the conventions have been harmonized
in order to make the database easily accessible. To aid in the interpretation
of the data, an aeroelastic model description is made of all facilities. 259
figs., 76 tabs., 51 refs.
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