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 48
... field. For instance, (Eq (2.2c) indicates that for the case of static thrust generation which, for VTOL, is synonymous with hovering out-of-ground effect, the ideal power required would be: Pidh = %TVU (2.3) where, in SI units, the ...
... field. For instance, (Eq (2.2c) indicates that for the case of static thrust generation which, for VTOL, is synonymous with hovering out-of-ground effect, the ideal power required would be: Pidh = %TVU (2.3) where, in SI units, the ...
Σελίδα 83
... field would contribute to a considerable increase of the kind/,0 values. As to span loading associated with various types of downwash distribution, the reader is referred to the lower part of Fig 2.22. 6. TANDEM ROTOR INTERFERENCE IN ...
... field would contribute to a considerable increase of the kind/,0 values. As to span loading associated with various types of downwash distribution, the reader is referred to the lower part of Fig 2.22. 6. TANDEM ROTOR INTERFERENCE IN ...
Σελίδα 90
... the West Coast American Helicopter Society Meeting, Sept 21 and 22, 1955. Mangler, K.W. and Squire, H.B. The induced Velocity Field ofa Rotor. R&M No 2642, 1953. BLADE ELEMENT THEORY The concept of modeling rotor blades through. 90 Theory.
... the West Coast American Helicopter Society Meeting, Sept 21 and 22, 1955. Mangler, K.W. and Squire, H.B. The induced Velocity Field ofa Rotor. R&M No 2642, 1953. BLADE ELEMENT THEORY The concept of modeling rotor blades through. 90 Theory.
Σελίδα 94
... fields in the immediate vicinity of the blade elements. Combining the blade element and momentum theories discussed in this chapter probably represents one of the simplest ways of finding time-average induced velocities at various ...
... fields in the immediate vicinity of the blade elements. Combining the blade element and momentum theories discussed in this chapter probably represents one of the simplest ways of finding time-average induced velocities at various ...
Σελίδα 102
... field of rotating blades and, in some special cases, the application of BLC. All of these parameters may be dependent on 7, thus making cd; = f(F). Consequently when integrating Eq (3.22), Ga; and 67 should be retained under the sign of ...
... field of rotating blades and, in some special cases, the application of BLC. All of these parameters may be dependent on 7, thus making cd; = f(F). Consequently when integrating Eq (3.22), Ga; and 67 should be retained under the sign of ...
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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