Fixed and Flapping Wing Aerodynamics for Micro Air Vehicle ApplicationsThis title reports on the latest research in the area of aerodynamic efficency of various fixed-wing, flapping wing, and rotary wing concepts. It presents the progress made by over fifty active researchers in the field. |
Contents
II Previous Work | 288 |
B Experimental Studies | 289 |
III Scope of Present Work | 290 |
V Wing Motion | 291 |
VII Velocity Field Data Analysis | 293 |
VIII Force Measurements | 294 |
IX Results and Discussion | 295 |
A Velocity Data | 296 |
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I Introduction | 62 |
II Approach | 63 |
III The Finite Element Approximation | 66 |
IV Fluid Solver | 67 |
V Grid Generation and Adaptive Refinement | 70 |
VI Results | 73 |
VII Database Validation | 76 |
IX Conclusions | 79 |
Acknowledgment | 80 |
Wind Tunnel Tests of Wings and Rings at Low Reynolds Numbers | 83 |
II Effect of Aspect Ratio and Planform on the Aerodynamic Lift and Drag | 84 |
III Effect of Low Reynolds Numbers on the Lift and Drag of Ring Airfoils | 86 |
References | 90 |
Effects of Acoustic Disturbances on Low Re Aerofoil Flows | 91 |
II Experimental Arrangements | 94 |
B Tunnel Environment Measurements | 95 |
C New StrainGauge Balance | 97 |
E Aerofoil Models | 98 |
B Aerodynamic Trends with Reynolds Number | 99 |
C The Effect of Background Acoustic Level | 102 |
F Effect of Acoustics on Aerodynamic Forces | 105 |
IV Discussion | 106 |
V Potential Use of Sound to Improve Performance | 110 |
VI Conclusions | 111 |
Acknowledgments | 112 |
Aerodynamic Characteristics of Low Aspect Ratio Wings at Low Reynolds Numbers | 115 |
I Introduction | 116 |
II Apparatus | 117 |
C Force Balance | 118 |
D Data Acquisition | 119 |
IV Uncertainty | 120 |
VI Discussion of Results | 121 |
A Comparison of Lift | 124 |
B Flow Visualization | 132 |
C Drag | 135 |
VII VortexLattice Method | 137 |
VIII Conclusions | 139 |
References | 140 |
Systematic Airfoil Design Studies at Low Reynolds Numbers | 143 |
II Design Process | 144 |
B Eppler Code | 145 |
III Parametric Studies in Airfoil Design | 147 |
B SG604x Series | 155 |
C S607x Series | 156 |
IV Summary and Conclusions | 164 |
Acknowledgments | 166 |
Numerical Optimization and WindTunnel Testing of Low Reynolds Number Airfoils | 169 |
I Introduction | 170 |
II Aerodynamic Model | 171 |
B Correlation of the Critical Amplification Factor | 173 |
IV Numerical Optimization of Low Reynolds Number Airfoils | 176 |
C Optimization Examples | 177 |
D Experimental Verification and Discussion | 178 |
V Experimental Investigations on Very Low Reynolds Number Airfoils | 182 |
VI Conclusion and Outlook | 188 |
Unsteady Stalling Characteristics of Thin Airfoils at Low Reynolds Number | 191 |
II Experimental Methods | 193 |
III Results and Discussion | 196 |
B Frequency Content of the Fluctuating Lift | 203 |
C The Role of the Separation Bubble | 206 |
IV Summary and Conclusions | 211 |
Acknowledgments | 212 |
Part II Flapping and Rotary Wing Aerodynamics | 215 |
Thrust and Drag in Flying Birds Applications to Birdlike Micro Air Vehicles | 217 |
II Avian Flight Performance | 219 |
B Dependence of Performance on Size and Design | 220 |
III Thrust Generation | 222 |
IV Drag Reduction | 224 |
V Wing Shape | 226 |
VI Conclusions | 227 |
Acknowledgments | 228 |
Lift and Drag Characteristics of Rotary and Flapping Wings | 231 |
I Introduction | 232 |
A BladeElement Analysis | 233 |
B HighLift Mechanisms | 235 |
C Applications of Insect Flight to Micro Air Vehicles | 237 |
B Force Coefficients | 238 |
C Wing Designs | 239 |
A Evidence for a LeadingEdge Vortex | 244 |
B MicroHelicopter MAVs | 246 |
A Rational Engineering Analysis of the Efficiency of Flapping Flight | 249 |
I Introduction | 250 |
II The Influence of Wake Roll Up on Flapping Flight | 253 |
B Numerical Results | 255 |
III Minimum Loss Flapping Theory | 258 |
B Inviscid Induced Power | 260 |
C Viscous Profile Power | 261 |
D Optimal Solution to the LargeAmplitude Flapping Problem | 263 |
IV Results | 264 |
B Flapping of a Rigid Wing at Low Reynolds Number | 268 |
V Summary and Discussion | 271 |
Acknowledgments | 272 |
LeadingEdge Vortices of Flapping and Rotary Wings at Low Reynolds Number | 275 |
I Introduction | 276 |
II Computational Modeling of a Rotary Wing | 277 |
III Numerical Accuracy | 279 |
B LeadingEdge Vortex of Rotary Wing | 281 |
V Conclusions | 284 |
Acknowledgment | 285 |
On the Flowfield and Forces Generated by a Flapping Rectangular Wing at Low Reynolds Number | 287 |
B Force Data | 299 |
X Conclusions | 303 |
Experimental and Computational Investigation of Flapping Wing Propulsion for Micro Air Vehicles | 307 |
I Introduction | 308 |
B Equations of Motion | 309 |
C Performance Criteria | 310 |
III Plunging Airfoils | 311 |
B Numerical Simulations | 313 |
C Experimental Investigations | 315 |
IV Pitching Airfoils | 318 |
V Pitching and Plunging Airfoils | 320 |
A Historical Perspective | 321 |
B Numerical Simulations | 323 |
VI Airfoil Combinations | 324 |
B Numerical Simulations | 325 |
C Experimental Investigations | 326 |
VII Summary and Prospective | 336 |
Aerodynamic Characteristics of Wings at Low Reynolds Number | 341 |
I Introduction | 343 |
B Reduced Frequency | 351 |
D Added Mass | 352 |
E Unsteady ThreeDimensional Wing | 353 |
G Other Computational Fluid Dynamic Studies | 354 |
B Unsteady Airfoil | 358 |
C Dragonfly and Damselfly | 360 |
D Other Insects | 361 |
IV Geometrical Consideration of Blade Element Theory | 363 |
B Wing or Blade Motion | 365 |
C Stroke Plane | 370 |
D Harmonic Analysis | 371 |
E Left Wing | 372 |
V Forces and Moments Acting on Beating Wings | 374 |
B Blade Element Theory | 379 |
C Centrifugal Force | 382 |
F Equations of Motion | 385 |
References | 391 |
A Nonlinear Aeroelastic Model for the Study of Flapping Wing Flight | 399 |
I Introduction | 401 |
II Structural Analysis | 405 |
III Aerodynamic and Inertial Forces and Moments | 407 |
A Aerodynamic Forces and Moments | 408 |
B Inertial Forces and Moments | 412 |
D Rigid and Center Sections | 413 |
F Bending and Twisting Moments | 414 |
IV Damping | 415 |
B Structural Damping | 417 |
V Results and Discussion | 419 |
A QuarterScale Model Wing Tests | 420 |
B 1996 FullScale StaticFlapping Tests | 421 |
C 1997 and 1998 Taxi Tests | 422 |
VI Conclusions | 427 |
References | 428 |
Euler Solutions for a FiniteSpan Flapping Wing | 429 |
I Introduction | 430 |
II Numerical Method | 432 |
III Investigations for TwoDimensional Flow | 433 |
B Results and Validation | 435 |
C Implementation of Wing Motion | 439 |
IV Investigations for ThreeDimensional Flow | 441 |
B Results for Pressure Distribution and Aerodynamic Coefficients | 443 |
C Flowfield Results | 446 |
V Conclusions | 449 |
From Soaring and Flapping Bird Flight to Innovative Wing and Propeller Constructions | 453 |
II Bionic Airfoil Construction | 454 |
B Bionic Wingtips and Their Potential for Induced Drag Reduction | 459 |
III Bionic Propeller | 465 |
IV Conclusions | 469 |
Acknowledgments | 470 |
Passive Aeroelastic Tailoring for Optimal Flapping Wings | 473 |
II Experimental Setup | 475 |
B Video Synchronization | 476 |
III Results | 477 |
B Experimental Results | 478 |
IV Conclusions | 481 |
Acknowledgments | 482 |
Shape Memory Alloy Actuators as Locomotor Muscles | 483 |
I Introduction | 484 |
II Brief Overview of SMA Actuators | 486 |
III Thermomechanical Transformation Fatigue of SMA Actuators | 488 |
IV Adaptive Control of SMA Actuator Wires | 491 |
V Energy Considerations for SMA Actuators | 494 |
VI SMA Actuators as Locomotor Muscles for a Biomimetic Hydrofoil | 496 |
VII Conclusions | 498 |
Part III Micro Air Vehicle Applications | 501 |
Mesoscale Flight and Miniature Rotorcraft Development | 503 |
A Hovering vs Forward Flight | 504 |
B Rotating vs Flapping | 506 |
II Approach | 508 |
A Aerodynamic Design | 509 |
B Rotor Fabrication | 512 |
C Power Systems | 513 |
D Control | 514 |
E Sensors | 515 |
IV Conclusions | 516 |
References | 517 |
Development of the Black Widow Micro Air Vehicle | 519 |
III Multidisciplinary Design Optimization | 520 |
IV Energy Storage | 524 |
V Motors | 525 |
VI Micropropeller Design | 526 |
VII Airframe Structural Design | 528 |
VIII Avionics | 530 |
IX Video Camera Payload | 531 |
X Stability and Control | 532 |
XII Ground Control Unit | 533 |
Acknowledgments | 535 |
Computation of Aerodynamic Characteristics of a Micro Air Vehicle | 537 |
I Introduction | 538 |
III Description of the Micro Air Vehicle Model | 539 |
IV Discussion of Results | 540 |
B Effect of Fuselage | 543 |
C Effect of Propeller | 545 |
E Effect of Propeller | 549 |
F Trajectory Simulation | 550 |
V Summary and Conclusions | 554 |
Optic Flow Sensors for MAV Navigation | 557 |
B Optic Flow Sensors | 559 |
III Description of the Optic Flow Sensor | 560 |
A Generalized Model for Implementing Optic Flow Algorithms | 561 |
C Fusion | 564 |
D Implementation of a FirstGeneration Hybrid Sensor | 565 |
E Implementation of a SecondGeneration Hybrid Sensor | 566 |
V Initial InFlight Experiments | 567 |
A Experiments with FirstGeneration Sensor on a Glider | 568 |
B Experiments with the SecondGeneration Sensor on an Aircraft | 570 |
VI NextGeneration Sensors | 571 |
VII Conclusion | 573 |
PROGRESS IN ASTRONAUTICS AND AERONAUTICS SERIES VOLUMES | 575 |
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Common terms and phrases
acoustic aerodynamic forces aerofoil Aeronautical AIAA aircraft airfoil amplitude angle of attack aspect ratio aspect ratio wings birds blade boundary layer Cā camber chord length computational configuration distribution downstroke drag coefficient dynamic stall effect efficiency equations Experimental Biology flapping flight flapping frequency flapping wing flow visualization flowfield Fluid freestream grid hovering increase induced inertial Insect Flight inviscid ISBN laminar leading edge leading-edge lift and drag lift coefficient lift-to-drag ratio linear low Reynolds number maximum measured Mechanics method micro air vehicles NACA optic flow optimal ornithopter oscillation panel code parameters performance pitch planform predicted pressure propeller Propulsion range reduced frequency Research rotary wing rotation rotor sensor separation bubble shown in Fig spanwise speed stall type surface theory thickness three-dimensional thrust trailing edge trailing-edge transition turbulence two-dimensional unsteady velocity viscous vortex vortices wake wind tunnel wingtip
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