NASA/TM–2020-220484 Wind Tunnel Performance Test of a Ducted Fan System Tomas Narbuntas Kaunas University of Technology Kaunas, Lithuania Sarah Conley Ames Research Center Moffett Field, California Kristen Kallstrom Science and Technology Corporation Moffett Field, California Anita M. Abrego Ames Research Center Moffett Field, California March 2020 The NASA STI Program . in Profile Since its founding, NASA has been dedicated to the advancement of aeronautics and space CONFERENCE PUBLICATION. Collected science. The NASA scientific and technical papers from scientific and technical information (STI) program plays a key part in conferences, symposia, seminars, or other helping NASA maintain this important role. meetings sponsored or co-sponsored by NASA. The NASA STI program operates under the auspices of the Agency Chief Information SPECIAL PUBLICATION. Scientific, Officer. 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Abrego Ames Research Center Moffett Field, California National Aeronautics and Space Administration Ames Research Center Moffett Field, California 94035-1000 March 2020 Available from: NASA STI Support Services National Technical Information Service Mail Stop 148 5301 Shawnee Road NASA Langley Research Center Alexandria, VA 22312 Hampton, VA 23681-2199 [email protected] 757-864-9658 703-605-6000 This report is also available in electronic form at http://ntrs.nasa.gov TABLE OF CONTENTS LIST OF FIGURES......................................................................................................................................... iv LIST OF TABLES .......................................................................................................................................... iv NOMENCLATURE .......................................................................................................................................... v SUMMARY ....................................................................................................................................................... 1 INTRODUCTION ............................................................................................................................................. 1 TEST FACILITY .............................................................................................................................................. 2 TEST DESCRIPTION ...................................................................................................................................... 2 Installation ................................................................................................................................................... 2 MODEL .............................................................................................................................................................. 4 Instrumentation and Data Acquisition ..................................................................................................... 6 Test Parameters ........................................................................................................................................... 7 DATA ................................................................................................................................................................. 7 Raw and Adjusted Data Tables ................................................................................................................. 7 Adjusted Data Processing .......................................................................................................................... 8 Aero Tare Corrections ......................................................................................................................... 8 Calibration Corrections ........................................................................................................................ 8 Zero Point Corrections ......................................................................................................................... 9 DISCUSSION .................................................................................................................................................... 9 CONCLUDING REMARKS ........................................................................................................................... 9 REFERENCES ................................................................................................................................................ 10 APPENDIX A—RAW DATA (FROM MASTER FILE) ......................................................................... 11 APPENDIX B—ADJUSTED DATA (FROM MASTER FILE) ............................................................. 83 APPENDIX C—RUN NUMBERS AND NAMES .................................................................................. 121 APPENDIX D—RAW DATA INPUT TABLES AND AERO TARE, CALIBRATION, AND ZERO POINT CORRECTIONS .................................................................................... 123 APPENDIX E—RAW AND ADJUSTED DATA RUN PARAMETER SUMMARY ...................... 131 APPENDIX F—SCANNED FIGURES FROM SOLOTREK DUCTED ROTOR TEST REVIEW ........................................................................................................................... 133 iii LIST OF FIGURES Figure 1. Ducted fan test installation in NASA Ames 7- by 10-Foot Wind Tunnel .............................. 3 Figure 2. Ducted fan model orientation: 2a. Hover/axial flight orientation, α = 90 deg, with thrust direction downstream as indicated by red arrow; 2b. Forward flight orientation, α = 0 deg, with thrust direction indicated by red arrow, and α = –20-deg thrust direction indicated by orange arrow (note that α = –20 deg only indicates direction of duct, not support structure). ................................................................................................................... 3 Figure 3. Ducted fan layout .................................................................................................................... 4 Figure 4. Fan blade geometry ................................................................................................................. 5 Figure 5. Exit vane with 1-inch flap ....................................................................................................... 6 LIST OF TABLES Table 1. Model parameters. .................................................................................................................. 4 Table 2. Fan blade detailed spanwise dimensions. ............................................................................... 5 Table 3. Test conditions. ....................................................................................................................... 7 iv NOMENCLATURE A Run number (start of interval) (see Table D3) B Run number (end of interval) if interval of the same data import formula continues through multiple runs (see Table D3) c Blade chord, in. cd Duct chord, ft cj Correction constant for the specific parameter (j—correction constant number) (see Table D5) d Fan diameter, ft D Drag, lb Fp Propulsive force, wind axis, lb FM Figure of merit i Point number (see Table D6) J Propeller advance ratio,