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Title:
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Visualization of the stalled area on large wind turbine blades
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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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1996
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ECN report number:
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Document type:
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ECN-RX--96-040
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Other
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Number of pages:
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Full text:
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6
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Download PDF
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Abstract:
A new detector to visualize stall, that can be seen as the successor oftufts, was developed. ECN applied for a patent on the detector recently. This
detector, the so-called 'stall flag', enables clear visualisation of the
stalled area even on large commercial wind turbines at low cost. The method
provides 'fast results', which is of special importance for the rapid
development of commercial wind turbines. This paper starts with an overview
of the arguments to develop the stall flags. Then the design of the stall
flag and the precise set-up of the visualisation method are presented. Also
the first results of the application of stall flags on turbines in the field
will be described. Among these results are high quality photographs of the
stalled area on a 10 m diameter wind turbine and several test pictures of the
Rotorline 32 rotor of the Nedwind 30 wind turbine. 6 figs., 3 refs.
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