Darrieus wind-turbine airfoil configurations
The purpose of this study was to determine what aerodynamic performance improvement, if any, could be achieved by judiciously choosing the airfoil sections for Darrieus wind turbine blades. Analysis was limited to machines using two blades of infinite aspect ratio, having rotor solidites from seven to twenty-one percent, and operating at maximum Reynolds numbers of approximately three million. Ten different airfoils, having thickness to chord ratios of twelve, fifteen and eighteen percent, were investigated. Performance calculations indicated that the NACA 6-series airfoils yield peak power coefficients at least as great as the NACA four-digit airfoils which have historically been chosen for Darrieus turbines. Furthermore, the power coefficient-tip speed ratio curves were broader and flatter for the 6-series airfoils. Sample calculations for an NACA 63/sub 2/-015 airfoil showed an annual energy output increase of 17 to 27% depending upon rotor solidity, compared to an NACA 0015 airfoil. An attempt was made to account for the flow curvature effects associated with Darrieus turbines by transforming the NACA 63/sub 2/-015 airfoil to an appropriate shape.
- Research Organization:
- Solar Energy Research Inst., Golden, CO (USA)
- DOE Contract Number:
- AC02-77CH00178
- OSTI ID:
- 5345760
- Report Number(s):
- SERI/TR-11045-1; ON: DE82017099
- Resource Relation:
- Other Information: Portions of document are illegible
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
DARRIEUS ROTORS
AERODYNAMICS
TURBINE BLADES
AIRFOILS
ASPECT RATIO
CALCULATION METHODS
DESIGN
PERFORMANCE
POWER COEFFICIENT
VERTICAL AXIS TURBINES
FLUID MECHANICS
MACHINERY
MECHANICS
REACTIVITY COEFFICIENTS
ROTORS
TURBINES
TURBOMACHINERY
WIND TURBINES
170602* - Wind Energy Engineering- Turbine Design & Operation