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 103
the hypothetical aircraft , the effect of stall on component stress levels , rather
than flying quality deterioration which may appear at the occurrance of stall , is
generally the limiting criterion . Tandems are more prone to flying quality stall ...
the hypothetical aircraft , the effect of stall on component stress levels , rather
than flying quality deterioration which may appear at the occurrance of stall , is
generally the limiting criterion . Tandems are more prone to flying quality stall ...
Σελίδα 105
A third method of generalizing test data is to correlate the inception of stall
observed in flight test with predicted increases in inplane torque levels which
occur at particular azimuthal positions 8 . The inplane torque per blade rises
abruptly as ...
A third method of generalizing test data is to correlate the inception of stall
observed in flight test with predicted increases in inplane torque levels which
occur at particular azimuthal positions 8 . The inplane torque per blade rises
abruptly as ...
Σελίδα 110
of air to travel from the leading edge to the trailing edge of the airfoil and is
therefore , a measure of the time it takes for stall to fully develop . Hence , the
term å ( c / V ) is the Aa that can occur before stall effects become significant . The
pitch ...
of air to travel from the leading edge to the trailing edge of the airfoil and is
therefore , a measure of the time it takes for stall to fully develop . Hence , the
term å ( c / V ) is the Aa that can occur before stall effects become significant . The
pitch ...
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Περιεχόμενα
Hover | 4 |
Blade Flapping Motion | 10 |
Effect of Flapping Hinge Offset | 16 |
Πνευματικά δικαιώματα | |
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actual aerodynamic aircraft airfoil analysis angle angle-of-attack application approach assumed average axis becomes blade body boundary layer calculations characteristics chord circulation climb coefficient component computed Consequently considered correction corresponding defined determined developed direction disc discussed distance distribution downwash drag effects element engine equation example expressed factor field Figure flapping flight flow fluid forces forward fuel function fuselage geometry given gross weight helicopter higher hover hypothetical increase indicated induced velocity influence integration lift limits loading located maximum means method momentum noted obtained operating performance pitch plane position potential power required practical predictions presented pressure problems radius range ratio relationship represents respect resulting rotor shape shown in Fig speed stall station strength surface theory thrust tion trailing usually 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 |