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 8
... Blade Loads Relying on an analogy with the fixed wings, one may anticipate that from the point-of-view of lift generation by a blade element located at station 7':- r/R, the most important air velocity component of the inplane velocity ...
... Blade Loads Relying on an analogy with the fixed wings, one may anticipate that from the point-of-view of lift generation by a blade element located at station 7':- r/R, the most important air velocity component of the inplane velocity ...
Σελίδα 11
... blade from its position of equilibrium From Eq (1.9) it can be seen that the blade is statically stable since dMcFl ... station, FE r/R, giving the position of the considered element along the blade span, (2) shape of the airfoil and ...
... blade from its position of equilibrium From Eq (1.9) it can be seen that the blade is statically stable since dMcFl ... station, FE r/R, giving the position of the considered element along the blade span, (2) shape of the airfoil and ...
Σελίδα 12
... blade element is that due to the rotor angular velocity (9.) about its axis. The velocity vector of this flow is ... station 75 r/R, the increment Ai;, under small-angle assumptions, will be: _ RFd dt d dt - A” : ___(V_§r_L-l = _ -HQ_ -_- -B/ ...
... blade element is that due to the rotor angular velocity (9.) about its axis. The velocity vector of this flow is ... station 75 r/R, the increment Ai;, under small-angle assumptions, will be: _ RFd dt d dt - A” : ___(V_§r_L-l = _ -HQ_ -_- -B/ ...
Σελίδα 24
... blade executing second harmonic cosine motion Some insight into the order of magnitude of the flapping harmonic ... station 71-, the thrust moment about a non-offset flapping hinge would be If the blades are completely rigid, it may be ...
... blade executing second harmonic cosine motion Some insight into the order of magnitude of the flapping harmonic ... station 71-, the thrust moment about a non-offset flapping hinge would be If the blades are completely rigid, it may be ...
Σελίδα 25
... blade at station rT. This means that the thrust per blade in hover (Tbh) would be proportional to U1),2 : Tbh ~Uih2 = (Vtr'r)2 (1.43) while in forward flight, Tbfd~ Ulfd2 = V,2(FT + )1 sin 11))'. (1.44) Combining Eqs (1.42), (1.43), and ...
... blade at station rT. This means that the thrust per blade in hover (Tbh) would be proportional to U1),2 : Tbh ~Uih2 = (Vtr'r)2 (1.43) while in forward flight, Tbfd~ Ulfd2 = V,2(FT + )1 sin 11))'. (1.44) Combining Eqs (1.42), (1.43), and ...
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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