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Aerodynamics of Low Reynolds Number Flyers Wei Shyy ... [et Al.]

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ISBN-10: 0521882788

ISBN-13: 9780521882781

Edition: 2007

Authors: Wei Shyy, Yongsheng Lian, Dragos Viieru, Hao-Wen Liu, Jianmin Tang

List price: $130.00
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Description:

Low Reynolds number aerodynamics is important to a number of natural and man-made flyers. Birds, bats, and insects have been of interest to biologists for years, and active study in the aerospace engineering community, motivated by interest in micro air vehicles (MAVs), has been increasing rapidly. The primary focus of this book is the aerodynamics associated with fixed and flapping wings. The book consider both biological flyers and MAVs, including a summary of the scaling laws-which relate the aerodynamics and flight characteristics to a flyer's sizing on the basis of simple geometric and dynamics analyses, structural flexibility, laminar-turbulent transition, airfoil shapes, and unsteady flapping wing aerodynamics. The interplay between flapping kinematics and key dimensionless parameters such as the Reynolds number, Strouhal number, and reduced frequency is highlighted. The various unsteady lift enhancement mechanisms are also addressed, including leading-edge vortex, rapid pitch-up and rotational circulation, wake capture, and clap-and-fling.
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Book details

List price: $130.00
Copyright year: 2007
Publisher: Cambridge University Press
Publication date: 10/22/2007
Binding: Hardcover
Pages: 196
Size: 7.50" wide x 10.00" long x 0.75" tall
Weight: 1.540
Language: English

Nomenclature
List of Abbreviations
Preface
Introduction
Flapping Flight in Nature
Unpowered Flight: Gliding and Soaring
Powered Flight: Flapping
Hovering
Forward Flight
Scaling
Geometric Similarity
Wingspan
Wing Area
Wing Loading
Aspect Ratio
Wing-Beat Frequency
Power Implication of a Flapping Wing
Upper and Lower Limits
Drag and Power
Concluding Remarks
Fixed, Rigid-Wing Aerodynamics
Laminar Separation and Transition to Turbulence
Navier-Stokes Equation and the Transition Model
The eN Method
Case Study: SD 7003
Factors Influencing Low Reynolds Number Aerodynamics
Re = 103-104
Re = 104-106
Effect of Free-Stream Turbulence
Effect of Unsteady Free-Stream
Three-Dimensional Wing Aerodynamics
Unsteady Phenomena at High Angles of Attack
Aspect Ratio and Tip Vortices
Wingtip Effect
Unsteady Tip Vortices
Concluding Remarks
Flexible-Wing Aerodynamics
General Background of Flexible-Wing Flyers
Flexible-Wing Models
Linear Membrane Model
Hyperelastic Membrane Model
Combined Fluid-Structural Dynamics Computation
Coupled Elastic Structures and Aerodynamics
Flexible Airfoils
Membrane-Wing Aerodynamics
Concluding Remarks
Flapping-Wing Aerodynamics
Scaling, Kinematics, and Governing Equations
Flapping Motion
Reynolds Number
Strouhal Number and Reduced Frequency
Nonstationary Airfoil Aerodynamics
Dynamic Stall
Thrust Generation of a Pitching/Plunging Airfoil
Simplified Flapping-Wing Aerodynamics Model
Lift-Enhancement Mechanisms in Flapping Wings
Leading-Edge Vortex
Rapid Pitch-Up
Wake Capture
Clap-and-Fling Mechanism
Wing Structural Flexibility
Effects of Reynolds Number, Reduced Frequency, and Kinematics on Hovering Aerodynamics
Hovering Kinematics
Scaling Effect on Force Generation for Hovering Airfoils
Aerodynamics of a Hovering Hawkmoth
Downstroke
Supination
Upstroke
Pronation
Evaluation of Aerodynamic Forces
Aerodynamic and Inertial Powers of Flapping Wings
Concluding Remarks
References
Index