Rotary-wing Aerodynamics, Τόμος 1Recent 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 58
The above result could have been obtained directly from Eq ( 2 . 3 ) ,
remembering that vu = 2vn for the actuator disc . Substituting the value for vn from
Eq ( 2 . 13 ) and rewriting Eq ( 2 . 21 ) in terms of the reciprocal of horsepower
loading ; i . e ...
The above result could have been obtained directly from Eq ( 2 . 3 ) ,
remembering that vu = 2vn for the actuator disc . Substituting the value for vn from
Eq ( 2 . 13 ) and rewriting Eq ( 2 . 21 ) in terms of the reciprocal of horsepower
loading ; i . e ...
Σελίδα 159
14 ) obtained from the combined momentum and blade - element theory when Vo
= 0 . 5 . SIMPLE ROTOR WAKE MODELS IN FORWARD FLIGHT 5 . 1
Development of the Concept in the consideration of axial rotor translations ( with
hovering ...
14 ) obtained from the combined momentum and blade - element theory when Vo
= 0 . 5 . SIMPLE ROTOR WAKE MODELS IN FORWARD FLIGHT 5 . 1
Development of the Concept in the consideration of axial rotor translations ( with
hovering ...
Σελίδα 84
At this point , it should be emphasized that although the Der value actually
depends on both Pind and Ppr , it is assumed that differences between Der
values obtained by the uniform downwash approach and those obtained either
through ...
At this point , it should be emphasized that although the Der value actually
depends on both Pind and Ppr , it is assumed that differences between Der
values obtained by the uniform downwash approach and those obtained either
through ...
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Περιεχόμενα
CHAPTERI Introduction | 1 |
Blade Lagging Motion | 30 |
Momentum Theory | 44 |
Πνευματικά δικαιώματα | |
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Συχνά εμφανιζόμενοι όροι και φράσεις
acceleration actual aerodynamic aircraft airfoil airfoil sections angle angle-of-attack application approach assumed average axis becomes blade body boundary layer calculations characteristics chord circulation climb coefficient component compressibility computed Consequently considered correction corresponding defined determined developed direction disc discussed distribution doublet downwash drag effects element engine equation example expressed factor field Figure flapping flight flow fluid forces forward flight fuel function fuselage geometry given gross weight helicopter hover hypothetical increase indicated induced velocity influence integration lift limits loading located Mach number maximum means methods noted obtained operating performance pitch plane position potential power required practical predictions presented pressure problem ratio relationship represents respect resulting rotor separation shape shown in Fig speed stall station strength surface tail theory thrust tion values variation various vortex vortices wake wing
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Flight Performance of Fixed and Rotary Wing Aircraft Antonio Filippone Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2006 |