Effects of blade preset pitch/offset on curved-blade Darrieus vertical axis wind turbine performance

Technical Report · Thu Oct 01 00:00:00 EDT 1981

OSTI ID:5243044

Klimas, P C; Worstell, M H

Current designs of curved-blade Darrieus vertical-axis wind turbines (VAWTs) have blades mounted in such a way that the position vector from the axis of rotation intersects the blade chord perpendicularly between the -25% and -50% chord points. This paper describes the effects on aerodynamic performance of the Sandia National Laboratories' (SNL) 5-m-dia turbine when its symmetrical cross-section blades are mounted such that the axis of rotation-blade chord position vector effects a normal intersection with the blade chord at points between -180% and +77% chord. These variations produce significant changes in cut-in tip-speed ratio, peak efficiency, and peak power.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 5243044
• Report Number(s): SAND-81-1762; ON: DE82004503
• Country of Publication: United States
• Language: English

Related Subjects

17 WIND ENERGY
170602* -- Wind Energy Engineering-- Turbine Design & Operation
AERODYNAMICS
AIRFOILS
COMPARATIVE EVALUATIONS
DARRIEUS ROTORS
EFFICIENCY
FLUID MECHANICS
MACHINERY
MECHANICS
POWER COEFFICIENT
REACTIVITY COEFFICIENTS
ROTORS
TURBINE BLADES
TURBINES
TURBOMACHINERY
VERTICAL AXIS TURBINES
WIND TURBINES