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Title:
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Stall FLEXTEETER: measurements
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Author(s):
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Published by:
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Publication date:
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ECN
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1995
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ECN report number:
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Document type:
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ECN-C--94-110
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ECN publication
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Number of pages:
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Full text:
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97
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Download PDF
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Abstract:
A two bladed rotor called FLEXTEETER, equipped with an elastomeric teeterand flexible beams was tested at constant speed, so that power was controlled
by stall. The project was a follow up of the FLEXTEETER project, in which the
same flexible rotor with passive tip pitch power control was designed, built
and tested at variable rotor speed. The follow up project, named Stall
FLEXTEETER evaluation, had three goals: (1) to collect a set of measurements
of rotor bending moments and rotor motions at normal operation at zero yaw,
at a fixed yaw misalignment (#+#30"o, #+#60"o) and while yawing
continuously at a fixed yaw rate (1.2 "o/s, 2.4 "o/s and 4.8 "o/s); (2) to
execute model calculations at external and internal conditions consistent
with the measurements; and (3) to evaluate the model used by comparison with
the measurements. The first goal was met almost completely, although during
the measurement campaign, damage at the central connection of the rotor was
observed. The damage was such that the rotor had to be dismounted from the
test facility and no more measurements could be made. The description of the
measured data and the experiences at the test will be given in this report.
The model calculations and the evaluation will be covered in a separate
report. 63 figs., 14 tabs., 8 refs.
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