NASA Technical Paper 2256 - CAFE Foundation

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- CONTENTS INTRODUCTION ................................................................ ..... I SYMBOLS AND ABBREVIATIONS .................. . ......... . ................. . ...... ... 3 REVIEW OF PAST NATURAL LAMINAR FLOW RESEARCH .................... ......... . ....... AIRPLANE DESCRIPTIONS AND CORRESPONDING EXPERIMENTS ...... ........................ 7 Airplanes ...................................................................... 7 Rutan VariEze ................................................................ 8 Rutan Long-EZ ............... . ......... . ...................................... 8 Rutan Laser Biplane Racer .................................................... 9 Gates Learjet Model 28/29 Longhorn ................ . .......................... 9 Cessna P-210 Centurion . ...................................................... 9 Beech 24R Sierra ..................................... . ....................... 9- Bellanca Skyrocket-II ........................................................ 9 Beech T-34C gloves ........ , .................................................. 10 Testing Procedures ............. ................................................ 10 Sublimating chemical detection of boundary-layer transition .................. 10 Acoustic detection of boundary-layer transition ..................... ......... 11 Other testing procedures .... . ................................................ 11 RESULTS ...... . Transition locations ......................................................... 12 Effect of fixed transition on canard ......................................... 12 Flight Experiments ............................................................. 13 Rutan VariEze ................................................................ 13 Rutan Long-EZ ................................................................ 14 Rutan Laser Biplane Racer .................................................... 15 Gates Learjet Model 28/29 Longhorn ........................................... 16 Cessn_ P-210 Centurion ....................................................... 16 Beech 24R Sierra ............................................................. 17 Bellanca skyrocket II ........................................................ 17 Beech T-34C gloves ........................................................... 19 DISCUSSION ............ ........................ ................................... 20 Transition Locations ........................................................... 20 Effects of Precipitation and Cloud Particles ................................... 21 Effects of Fixed Transition .................................................... 22 Propeller Slipstream Effects ................................................... 23 Waviness ............... ..................... ........................ ........... 24 Sweep Effects ...................................... ............................ 24 Insect Debris Contamination .................................................... 25 CONCLUSIONS ........................................... . ............. ..... ........ 26 _4 APPENDIX - SURFACE WAVINESS ON RESEARCH MODELS ........................... . ....... 28 J • i| ±ii 5
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_i _ 30. Braslow, Albert L.; and Kn
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58 OI_IGINAL PAGE-Ig _F POOR QUALrT
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62 TABLE 5.- PHYSICAL CIIARACTERIST
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TABLE 10.- PHYSICAL CHARACTERISTICS
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ORIGINAL PAGE IR OF POOR OUALITY I
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NASA Technical Paper 2256 - CAFE Foundation

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