Journal ArticleDOI
Compressibility effects on oscillating rotor blades in hovering flight
W. P. Jones,B. M. Rao +1 more
TLDR
In this article, a theory is developed and used for determining the influence of compressibility on the aerodynamic forces acting on helicopter rotor blades when oscillating in hovering flight, and the usual two-dimensional mathematical model of the flow is adopted in which a section of the reference rotor blade and its helical wake is replaced by an airfoil with a straight wake and a system of regularly spaced infinite wakes below, the amount of spacing depending on the downward flow induced by the rotor and the number of blades.Abstract:
: A theory is developed and used for determining the influence of compressibility on the aerodynamic forces acting on helicopter rotor blades when oscillating in hovering flight. The usual two-dimensional mathematical model of the flow is adopted in which a section of the reference rotor blade and its helical wake is replaced by an airfoil with a straight wake and a system of regularly spaced infinite wakes below, the amount of spacing depending on the downward flow induced by the rotor and the number of blades. (Author)read more
Citations
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Journal ArticleDOI
Local nonsimilarity boundary-layer solutions
TL;DR: In this article, a new solution method for nonsimilarity boundary layers, applicable locally and independently of information from other stream wise positions, is described and implemented, which is of the same type as those encountered in the treatment of similarity boundary layers.
Formulation and solution of rotary-wing aeroelastic stability and response problems
TL;DR: In this paper, the state of the art in the formulation and solution of rotary-wing aeroelastic stability and response problems is reviewed in detail, including the approximations used in the structural, inertia and aerodynamic operators.
Journal ArticleDOI
Recent developments in rotary-wing aeroelasticity
TL;DR: A review of rotary-wing aeroelasticity during the past eight years is given in this article, where the authors present the research done in rotary wing aero elasticity in a unified manner.
Journal ArticleDOI
Wing-Body Aerodynamic Interaction
Holt Ashley,William P. Rodden +1 more
TL;DR: In this paper, the authors present a review of the literature on interference in aerodynamic analysis of planar wings and their interaction with other lifting surfaces (wings, tails, con-trols).
Proceedings ArticleDOI
Rotary-wing aeroelasticity with application to VTOL vehicles
TL;DR: In this article, the authors present an assessment of the state of the art in rotary-wing aeroelasticity as applied to conventional helicopters as well as other VTOL vehicles such as tilting prop-rotors, the X-wing and a hybrid heavy lift vehicle.
References
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Journal ArticleDOI
Local nonsimilarity boundary-layer solutions
TL;DR: In this article, a new solution method for nonsimilarity boundary layers, applicable locally and independently of information from other stream wise positions, is described and implemented, which is of the same type as those encountered in the treatment of similarity boundary layers.
Journal ArticleDOI
The Influence of the Wake on the Flutter and Vibration of Rotor Blades
TL;DR: In this paper, an approximate theory is described which takes into account the influence of the wake on the aerodynamic derivatives of an oscillating rotor blade, and it is shown that the most important parameter is the number of cycles of the oscillation which occur during one revolution of the rotor.
Journal ArticleDOI
Some Considerations on the Air Forces on a Wing Oscillating Between Two Walls for Subsonic Compressible Flow
TL;DR: In this paper, the effect of the presence of the walls is shown to be very significant near the resonant frequency and, for certain conditions, to be large even at frequencies well removed from resonance.