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Load attenuating passively adaptive wind turbine blade

Patent ·
OSTI ID:875189
 [1];  [1]
  1. Albuquerque, NM
+ Show Author Affiliations

A method and apparatus for improving wind turbine performance by alleviating loads and controlling the rotor. The invention employs the use of a passively adaptive blade that senses the wind velocity or rotational speed, and accordingly modifies its aerodynamic configuration. The invention exploits the load mitigation prospects of a blade that twists toward feather as it bends. The invention includes passively adaptive wind turbine rotors or blades with currently preferred power control features. The apparatus is a composite fiber horizontal axis wind-turbine blade, in which a substantial majority of fibers in the blade skin are inclined at angles of between 15 and 30 degrees to the axis of the blade, to produces passive adaptive aeroelastic tailoring (bend-twist coupling) to alleviate loading without unduly jeopardizing performance.

Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC04-94AL85000
Assignee:
Sandia Corporation (Albuquerque, NM)
Patent Number(s):
H002057
Application Number:
09/758166
OSTI ID:
875189
Country of Publication:
United States
Language:
English

References (11)

NREL airfoil families for HAWTs report January 1995
Design criteria for passive pitch control of wind turbines using self-twisting blades journal July 1995
Performance of twist-coupled blades on variable speed rotors conference February 2013
Load mitigation with twist-coupled HAWT blades conference February 2013
Aeroelastic behavior of twist-coupled HAWT blades conference February 2013
The use of carbon fibers in wind turbine blade design: A SERI-8 blade example report March 2000
Design, Manufacture and Testing of A Bend-Twist D-Spar report June 1999
Implementation of bending-torsion coupling in the design of a wind-turbine rotor-blade journal July 1999
Moment-Based Probability Modeling and Extreme Response Estimation, The FITS Routine Version 1.2 report November 1999
Effects of Blade Bending on Aerodynamic Control of Fluctuating Loads on Teetered HAWT Rotors journal November 1996
Self-regulating composite bearingless wind turbine journal January 1978

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