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Titel:
Aero-elastic stability analysis tools for large wind turbine rotor blades
 
Auteur(s):
 
Gepubliceerd door: Publicatie datum:
ECN Windenergie 1-8-2003
 
ECN publicatienummer: Publicatie type:
ECN-RX--03-051 Conferentiebijdrage
 
Aantal pagina's: Volledige tekst:
5 Download PDF  (74kB)

Gepresenteerd op: European Wind Energy Conference 2003, Madrid, Spain, 16-19 juni 2003.

Samenvatting:
Although modern large size wind turbines do not operate in stall, thetrends associated with scaling of dimensions reduce the stability of edgewise blade vibrations. At ECN Wind Energy the aero-elastic vibrations of rotor blades are investigated by participation in the research projects STABTOOL, DAMPBLADE, and the ongoing STABCON project. The developments within these projects have resulted in some aero-elastic stability analysis codes.
The relatively simple but fast code BLADMODE can be used to investigate modifications of the blade structure on the aero-elastic behaviour. These investigations include 'Structural Pitch', which is a modification of the direction of vibration realised by shifting the UD layers. It was also shown that operation at high lift coefficients gives a reduced damping of the edgewise vibrations because at high lift values, airfoils show an increasing drag coefficient with angle of attack ('drag stall').


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