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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... Downwash Characteristics on Induced Power . .74 5.1 Uniform Downwash —— No Tip Losses . . . . . . . . . . . . . . . . . . . . . 74 5.2 Nonuniform Downwash and Tip Losses — The k/nd Factor . . . . . . .78 5.3 Examples ofkmd Values and ...
... Downwash Characteristics on Induced Power . .74 5.1 Uniform Downwash —— No Tip Losses . . . . . . . . . . . . . . . . . . . . . 74 5.2 Nonuniform Downwash and Tip Losses — The k/nd Factor . . . . . . .78 5.3 Examples ofkmd Values and ...
Σελίδα 1
... specific fuel consumption (kG/s)/kG or (lb/s)/lb U velocity of flow approaching the blade m/s or fps V velocity of flow in general m/s or fps Q downwash velocity m/s or fps 5 rrh/R VII/RQ I/r ngfib v1: >17: qs38ceuip§§ lllll w CHAPTER I.
... specific fuel consumption (kG/s)/kG or (lb/s)/lb U velocity of flow approaching the blade m/s or fps V velocity of flow in general m/s or fps Q downwash velocity m/s or fps 5 rrh/R VII/RQ I/r ngfib v1: >17: qs38ceuip§§ lllll w CHAPTER I.
Σελίδα 3
... downwash covered areas. The low energy consumption and relatively low downwash associated with static thrust result from a low loading of the lift generators (thrust-per-unit-area of the lift generating surface). It is interesting to ...
... downwash covered areas. The low energy consumption and relatively low downwash associated with static thrust result from a low loading of the lift generators (thrust-per-unit-area of the lift generating surface). It is interesting to ...
Σελίδα 5
... downwash velocity (vw). 100MB 50 000. ,. a. 'Al 41. TU HBOFANS ii' i l l 44 ' PURE JETS 10000 x [i1- JET5+ AFTERBURNE , 5000 ' AIR B ATHING TH HUS GENE HATORS SPECIFIC IMPULSE — S ROCKETS 100 I500 1000 6000 'I0 000 60 000 DOWNWASH VELOCITY ...
... downwash velocity (vw). 100MB 50 000. ,. a. 'Al 41. TU HBOFANS ii' i l l 44 ' PURE JETS 10000 x [i1- JET5+ AFTERBURNE , 5000 ' AIR B ATHING TH HUS GENE HATORS SPECIFIC IMPULSE — S ROCKETS 100 I500 1000 6000 'I0 000 60 000 DOWNWASH VELOCITY ...
Σελίδα 48
... downwash velocity is synonymous with minimization of the power required to generate a given thrust under assumed conditions of flight velocity, air density, and the cross-section area of the fully-developed slipstream. Thus, the power ...
... downwash velocity is synonymous with minimization of the power required to generate a given thrust under assumed conditions of flight velocity, air density, and the cross-section area of the fully-developed slipstream. Thus, the power ...
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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