small wind turbine tunnel tests.pdf

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Revised October 2004 • NREL/SR-500-34515
Wind Tunnel Aerodynamic
Tests of Six Airfoils for Use on
Small Wind Turbines
Period of Performance:
October 31, 2002–January 31, 2003
Michael S. Selig and Bryan D. McGranahan
University of Illinois at Urbana-Champaign
Urbana, Illinois
National Renewable Energy Laboratory
1617 Cole Boulevard, Golden, Colorado 80401-3393
303-275-3000 • www.nrel.gov
Operated for the U.S. Department of Energy
Office of Energy Efficiency and Renewable Energy
by Midwest Research Institute • Battelle
Contract No. DE-AC36-99-GO10337
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Revised October 2004 • NREL/SR-500-34515
Wind Tunnel Aerodynamic
Tests of Six Airfoils for Use on
Small Wind Turbines
Period of Performance:
October 31, 2002–January 31, 2003
Michael S. Selig and Bryan D. McGranahan
University of Illinois at Urbana-Champaign
Urbana, Illinois
NREL Technical Monitor: Paul Migliore
Prepared under Subcontract No. XCX-2-32231-01
National Renewable Energy Laboratory
1617 Cole Boulevard, Golden, Colorado 80401-3393
303-275-3000 • www.nrel.gov
Operated for the U.S. Department of Energy
Office of Energy Efficiency and Renewable Energy
by Midwest Research Institute • Battelle
Contract No. DE-AC36-99-GO10337
755219145.010.png 755219145.011.png
NOTICE
This report was prepared as an account of work sponsored by an agency of the United States
government. Neither the United States government nor any agency thereof, nor any of their employees,
makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy,
completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents
that its use would not infringe privately owned rights. Reference herein to any specific commercial
product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily
constitute or imply its endorsement, recommendation, or favoring by the United States government or any
agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect
those of the United States government or any agency thereof.
Available electronically at http://www.osti.gov/bridge
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phone: 865.576.8401
fax: 865.576.5728
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Contents
Foreword.......................... iii
Preface........................... vii
Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . ix
ListofFigures ........................ xi
ListofTables........................ xv
ListofSymbolsandAcronyms ................ xvii
1AirfoilsTested.......................1
2 Wind Tunnel Facility and Measurement Techniques . . . . . . 3
2.1 Experimental Facility and Flow Quality Measurements . . 3
2.1.1TurbulenceIntensity ...............6
2.1.2 Freestream Velocity . . . . . . . . . . . . . . . 8
2.1.3FreestreamFlowAngularity .......... 11
2.2AirfoilModels.................... 14
2.3 Performance Data Measurement Techniques
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2.3.1 Lift Force Measurement .
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2.3.2 Drag Force Measurement
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2.3.3 Pitching Moment Measurement .
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2.4 Data Acquisition and Reduction .
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2.4.1 Wind-Tunnel Boundary Corrections
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2.4.2 Additional Velocity Corrections .
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2.4.3 Corrections to Measured Quantities .
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2.5 Calibrations and Uncertainty Analysis .
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3DataValidation...................... 29
3.1 Surface Oil Flow Measurements . . . . . . . . . . . . 29
3.2LiftandMomentData................. 33
3.3DragPolars ..................... 35
3.4Summary....................... 37
4SummaryofAirfoilData.................. 39
5 Airfoil Profiles and Performance Plots
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References .........................105
Appendix A Tabulated Airfoil Coordinates
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Appendix B Tabulated Polar Data .
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