Basic helicopter aerodynamics
"Basic Helicopter Aerodynamics, now in its third edition, is widely appreciated as an easily accessible, rounded introduction to the first principles of the aerodynamics of helicopter flight. Concentrating on the well-known Sikorsky configuration of single main rotor with tail rotor, the author...
| Autor principal: | |
|---|---|
| Otros Autores: | |
| Formato: | Libro electrónico |
| Idioma: | Inglés |
| Publicado: |
Chichester, England ; Hoboken, N.J. :
Wiley
2011.
|
| Edición: | 3rd ed |
| Colección: | Aerospace series (Chichester, England)
|
| Materias: | |
| Ver en Biblioteca Universitat Ramon Llull: | https://discovery.url.edu/permalink/34CSUC_URL/1im36ta/alma991009627692106719 |
Tabla de Contenidos:
- Basic Helicopter Aerodynamics; Contents; About the Authors; Series Preface; Preface to First Edition; Preface to Second Edition; Preface to Third Edition; Notation; Units; Abbreviations; 1 Introduction; 1.1 Looking Back; 1.1.1 Early Years; 1.1.2 First World War Era; 1.1.3 Inter-war Years; 1.1.4 Second World War Era; 1.1.5 Post-war Years; 1.1.6 The Helicopter from an Engineering Viewpoint; 1.2 Book Presentation; Reference; 2 Rotor in Vertical Flight: Momentum Theory and Wake Analysis; 2.1 Momentum Theory for Hover; 2.2 Non-dimensionalization; 2.3 Figure of Merit; 2.4 Axial Flight
- 2.5 Momentum Theory for Vertical Climb2.6 Modelling the Streamtube; 2.7 Descent; 2.8 Wind Tunnel Test Results; 2.9 Complete Induced-Velocity Curve; 2.9.1 Basic Envelope; 2.9.2 Autorotation; 2.9.3 Ideal Autorotation; 2.10 Summary Remarks on Momentum Theory; 2.11 Complexity of Real Wake; 2.12 Wake Analysis Methods; 2.13 Ground Effect; 2.14 Brownout; References; 3 Rotor in Vertical Flight: Blade Element Theory; 3.1 Basic Method; 3.2 Thrust Approximations; 3.3 Non-uniform Inflow; 3.3.1 Constant Downwash; 3.4 Ideal Twist; 3.5 Blade Mean Lift Coefficient; 3.6 Power Approximations; 3.7 Tip Loss
- 3.8 Example of Hover CharacteristicsReference; 4 Rotor Mechanisms for Forward Flight; 4.1 The Edgewise Rotor; 4.2 Flapping Motion; 4.3 Rotor Control; 4.4 Equivalence of Flapping and Feathering; 4.4.1 Blade Sailing; 4.4.2 Lagging Motion; 4.4.3 Coriolis Acceleration; 4.4.4 Lag Frequency; 4.4.5 Blade Flexibility; 4.4.6 Ground Resonance; References; 5 Rotor Aerodynamics in Forward Flight; 5.1 Momentum Theory; 5.2 Descending Forward Flight; 5.3 Wake Analysis; 5.3.1 Geometry of the Rotor Flow; 5.4 Blade Element Theory; 5.4.1 Factors Involved; 5.4.2 Thrust; 5.4.3 In-Plane H-force
- 5.4.4 Torque and Power5.4.5 Flapping Coefficients; 5.4.6 Typical Numerical Values; References; 6 Aerodynamic Design; 6.1 Introductory; 6.2 Blade Section Design; 6.3 Blade Tip Shapes; 6.3.1 Rectangular; 6.3.2 Swept; 6.3.3 Advanced Planforms; 6.4 Tail Rotors; 6.4.1 Propeller Moment; 6.4.2 Precession - Yaw Agility; 6.4.3 Calculation of Downwash; 6.4.4 Yaw Acceleration; 6.4.5 Example - Sea King; 6.5 Parasite Drag; 6.6 Rear Fuselage Upsweep; 6.7 Higher Harmonic Control; 6.8 Aerodynamic Design Process; References; 7 Performance; 7.1 Introduction; 7.2 Hover and Vertical Flight
- 7.3 Forward Level Flight7.4 Climb in Forward Flight; 7.4.1 Optimum Speeds; 7.5 Maximum Level Speed; 7.6 Rotor Limits Envelope; 7.7 Accurate Performance Prediction; 7.8 A World Speed Record; 7.9 Speculation on the Really Low-Drag Helicopter; 7.10 An Exercise in High-Altitude Operation; 7.11 Shipborne Operation; References; 8 Trim, Stability and Control; 8.1 Trim; 8.2 Treatment of Stability and Control; 8.3 Static Stability; 8.3.1 Incidence5 Disturbance; 8.3.2 Forward Speed Disturbance; 8.3.3 Angular Velocity (Pitch or Roll Rate) Disturbance; 8.3.4 Sideslip Disturbance; 8.3.5 Yawing Disturbance
- 8.3.6 General Conclusion
