Rotary-Wing AerodynamicsCourier Corporation, 22 Απρ 2013 - 640 σελίδες Recent literature related to rotary-wing aerodynamics has increased geometrically; yet, the field has long been without the benefit of a solid, practical basic text. To fill that void in technical data, NASA (National Aeronautics and Space Administration) commissioned the highly respected practicing engineers and authors W. Z. Stepniewski and C. N. Keys to write one. The result: Rotary-Wing Aerodynamics, a clear, concise introduction, highly recommended by U.S. Army experts, that provides students of helicopter and aeronautical engineering with an understanding of the aerodynamic phenomena of the rotor. In addition, it furnishes the tools for quantitative evaluation of both rotor performance and the helicopter as a whole. Now both volumes of the original have been reprinted together in this inexpensive Dover edition. In Volume I: "Basic Theories of Rotor Aerodynamics," the concept of rotary-wing aircraft in general is defined, followed by comparison of the energy effectiveness of helicopters with that of other static-thrust generators in hover, as well as with various air and ground vehicles in forward translation. Volume II: "Performance Prediction of Helicopters" offers practical application of the rotary-wing aerodynamic theories discussed in Volume I, and contains complete and detailed performance calculations for conventional single-rotor, winged, and tandem-rotor helicopters. Graduate students with some background in general aerodynamics, or those engaged in other fields of aeronautical or nonaeronautical engineering, will find this an essential and thoroughly practical reference text on basic rotor dynamics. While the material deals primarily with the conventional helicopter and its typical regimes of flight, Rotary-Wing Aerodynamics also provides a comprehensive insight into other fields of rotary-wing aircraft analysis as well. |
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Σελίδα 84
... rotor becomes almost equal to the speed of flight (V' E V). 6.2 Axial Flow Velocities and Induced Power The average induced velocity of the front rotor ... power (in Nm/s or ft-lb/s) of the rear rotor will be Pindre = Tre(2Vfr + Vre); (2-78) ...
... rotor becomes almost equal to the speed of flight (V' E V). 6.2 Axial Flow Velocities and Induced Power The average induced velocity of the front rotor ... power (in Nm/s or ft-lb/s) of the rear rotor will be Pindre = Tre(2Vfr + Vre); (2-78) ...
Σελίδα 85
... power of the tandem would be equal to twice that of the two isolated rotors producing the same thnist. However, in numerous practical cases, the rear rotor is not fully submerged in the streamtu be affected by the front rotor. This may ...
... power of the tandem would be equal to twice that of the two isolated rotors producing the same thnist. However, in numerous practical cases, the rear rotor is not fully submerged in the streamtu be affected by the front rotor. This may ...
Σελίδα 89
... power required per unit of thrust. A satisfactory interpretation of power ... rotor) can be performed by substituting proper conceptual models based on ... rotor design, as it singles out disc loading as the only important parameter ...
... power required per unit of thrust. A satisfactory interpretation of power ... rotor) can be performed by substituting proper conceptual models based on ... rotor design, as it singles out disc loading as the only important parameter ...
Σελίδα 91
... rotor power coefficient: CP 5 P/1rR2p Vta rotor torque coefficient: Co E Q/1rR3p Vt rotor thrust coefficient: CT 5 T/1rR2p Vt2 chord section drag coefficient section lift coefficient section moment coefficient blade area power ...
... rotor power coefficient: CP 5 P/1rR2p Vta rotor torque coefficient: Co E Q/1rR3p Vt rotor thrust coefficient: CT 5 T/1rR2p Vt2 chord section drag coefficient section lift coefficient section moment coefficient blade area power ...
Σελίδα 100
... rotor with blades of defined geometry and known airfoilesection characteristics. This, in tu rn, would permit one to calculate the thrust developed by the rotor, both in hovering and climb, as well as the corresponding power required in ...
... rotor with blades of defined geometry and known airfoilesection characteristics. This, in tu rn, would permit one to calculate the thrust developed by the rotor, both in hovering and climb, as well as the corresponding power required in ...
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aerodynamic airfoil airfoil section airspeed altitude angle angle-of-attack assumed autorotation axis azimuth blade element blade element theory blade station boundary layer calculations chord circulation collective pitch computed configurations cruise defined descent determined downwash downwash velocity drag coefficient effects engine equation expressed factor field Figure first flapping hinge flow fluid forward flight fuel fuselage gross weight Helicopter Rotor hover hypothetical helicopter increase induced drag induced power induced velocity influence interference drag lift coefficient lifting surface Mach number main rotor maximum momentum theory nondimensional obtained parasite drag percent performance pitch power required predictions pressure profile drag profile power radius rate of climb ratio resulting Reynolds number rotor disc rotor power rotor thrust shown in Fig significant single-rotor slipstream specific stall tail rotor tandem tandem-rotor tion TRUE AIRSPEED values variation vector velocity component velocity potential vortex filament vortex theory vortices wake wind-tunnel wing