NDLI: Comparison of Wind Tunnel Airfoil Performance Data With Wind Turbine Blade Data

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Butterfield, C. P. Scott, George Musial, Walt
Copyright Year	1992
Abstract	Horizontal axis wind turbine (HAWT) performance is usually predicted by using wind tunnel airfoil performance data in a blade element momentum theory analysis. This analysis assumes that the rotating blade airfoils will perform as they do in the wind tunnel. However, when stall-regulated HAWT performance is measured in full-scale operation, it is common to find that peak power levels are significantly greater than those predicted. Pitch-controlled rotors experience predictable peak power levels because they do not rely on stall to regulate peak power. This has led to empirical corrections to the stall predictions. Viterna and Corrigan (1981) proposed the most popular version of this correction. But very little insight has been gained into the basic cause of this discrepancy. The National Renewable Energy Laboratory (NREL), funded by the DOE, has conducted the first phase of an experiment which is focused on understanding the basic fluid mechanics of HAWT aerodynamics. Results to date have shown that unsteady aerodynamics exist during all operating conditions and dynamic stall can exist for high yaw angle operation. Stall hysteresis occurs for even small yaw angles and delayed stall is a very persistent reality in all operating conditions. Delayed stall is indicated by a leading edge suction peak which remains attached through angles of attack (AOA) up to 30 degrees. Wind tunnel results show this peak separating from the leading edge at 18 deg AOA. The effect of this anomaly is to raise normal force coefficients and tangent force coefficients for high AOA. Increased tangent forces will directly affect HAWT performance in high wind speed operation. This report describes pressure distribution data resulting from both wind tunnel and HAWT tests. A method of bins is used to average the HAWT data which is compared to the wind tunnel data. The analysis technique and the test set-up for each test are described.
Starting Page	119
Ending Page	124
Page Count	6
File Format	PDF
ISSN	01996231
e-ISSN	15288986
Journal	Journal of Solar Energy Engineering
Volume Number	114
Issue Number	2
DOI	10.1115/1.2929989
Language	English
Publisher	The American Society of Mechanical Engineers
Publisher Date	1992-05-01
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Aerodynamics Airfoils Blades Fluid mechanics Force Horizontal axis wind turbines Momentum Pressure Renewable energy Rotating blades Rotors Suction Wind tunnels Wind turbines Wind velocity Yaw
Content Type	Text
Resource Type	Article
Subject	Renewable Energy, Sustainability and the Environment Energy Engineering and Power Technology

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