Yaw dynamics of horizontal axis wind turbines: Second annual report

Technical Report · Wed Mar 01 04:00:00 EST 1989

DOI:https://doi.org/10.2172/6013227· OSTI ID:6013227

Hansen, A.; Xudong, C.

Numerous problems associated with yaw exist on free-yaw and yaw- driven wind turbines. Yaw-driven machines experience failures in the yaw drive mechanism due to excessive loads, while free-yaw machines experience high yaw rates and yaw misalignment problems. This report describes validation of a model for prediction of wind turbine yaw behavior. The model accounts for the coupled yaw and blade flapping motion of wind machines. The results from the model are compared to results from other analysis methods and to test data. Wind tunnel tests of a rigid-hub, two-bladed rotor, as well as full scale field test data from a rigid-hub, three-bladed turbine are used as the comparison cases in this report. The model predictions show good qualitative agreement with test data, but the magnitudes of predicted yaw moments are in error for some comparison cases. Future work will involve a more in-depth comparison of model results to comprehensive machine test data. Refinements will be made to the analytical model in order to improve correlations between theory and experiment. 7 refs., 19 figs., 2 tabs.

• Research Organization: Utah Univ., Salt Lake City (USA). Dept. of Mechanical Engineering
• DOE Contract Number: AC02-83CH10093
• OSTI ID: 6013227
• Report Number(s): SERI/STR-217-3476; ON: DE89000888
• Country of Publication: United States
• Language: English

Related Subjects

17 WIND ENERGY
170602* -- Wind Energy Engineering-- Turbine Design & Operation
99 GENERAL AND MISCELLANEOUS
990220 -- Computers
Computerized Models
& Computer Programs-- (1987-1989)
COMPUTER CALCULATIONS
COMPUTER CODES
DATA ANALYSIS
DIFFERENTIAL EQUATIONS
DOCUMENT TYPES
DYNAMICS
EQUATIONS
H CODES
HORIZONTAL AXIS TURBINES
LAGRANGE EQUATIONS
MACHINERY
MECHANICS
PARTIAL DIFFERENTIAL EQUATIONS
PROGRESS REPORT
S CODES
TURBINES
TURBOMACHINERY
U CODES
WIND TURBINES
Y CODES