Time-marching transonic flutter solutions including angle-of-attack effects [PDF]
Transonic aeroelastic solutions based upon the transonic small perturbation potential equation were studied. Time-marching transient solutions of plunging and pitching airfoils were analyzed using a complex exponential modal identification technique, and
Bennett, R. M. +3 more
core +1 more source
High Reynolds Number Test of the Boeing TR77 Airfoil in the Langley 0.3-Meter Transonic Cryogenic Tunnel [PDF]
A Boeing TR77 airfoil associated with the Advanced Technology Airfoil Test (ATAT) program was tested in the Langley 0.3 m Transonic Cryogenic Tunnel. Limited analysis of the data indicated that increasing Reynolds number for a fixed Mach number resulted ...
Chu, Julio +3 more
core +1 more source
Aerodynamic characteristics of several airfoils of low aspect ratio [PDF]
This paper presents the results of wind-tunnel tests of several airfoils of low aspect ratio. The airfoils included three circular Clark Y airfoils with different amounts of dihedral, two Clark Y airfoils with slots in their portions, and three flat ...
Zimmerman, C H
core +1 more source
Euler flow predictions for an oscillating cascade using a high resolution wave-split scheme [PDF]
A compressible flow code that can predict the nonlinear unsteady aerodynamics associated with transonic flows over oscillating cascades is developed and validated.
Huff, Dennis L. +2 more
core +1 more source
High Lift, Low Pitching Moment Airfoils [PDF]
, 1988 Two families of airfoil sections which can be used for helicopter/rotorcraft rotor blades or aircraft propellers of a particular shape are prepared. An airfoil of either family is one which could be produced by the combination of a camber line and a ...
Noonan, Kevin W.
core +1 more source
State-space model identification and feedback control of unsteady aerodynamic forces
, 2014 Unsteady aerodynamic models are necessary to accurately simulate forces and develop feedback controllers for wings in agile motion; however, these models are often high dimensional or incompatible with modern control techniques.
Brunton, Steven L. +2 more
core +1 more source
Linear force and moment equations for an annular smooth shaft seal perturbed both angularly and laterally [PDF]
, 1982 Coefficients are derived for equations expressing the lateral force and pitching moments associated with both planar translation and angular perturbations from a nominally centered rotating shaft with respect to a stationary seal.
Dijulio, R. +3 more
core +1 more source
VSAERO analysis of tip planforms for the free-tip rotor [PDF]
The results of a numerical analysis of two interacting lifting surfaces separated in the spanwise direction by a narrow gap are presented. The configuration consists of a semispan wing with the last 32 percent of the span structurally separated from the ...
Fortin, P. E., Martin, D. M.
core +1 more source
Experimental studies on the “Phantom Yaw Effect” at maneuvering slender bodies [PDF]
, 2011 Asymmetric vortices can occur unexpectedly on slender bodies at high angles of attack. These vortices separating from the nose or/and shoulder region induce a side force and also a corresponding yawing moment often referred to as "phantom yaw".
Schülein, Erich, Wysocki, Oliver
core
Free wing assembly for an aircraft [PDF]
, 1978 A free wing is attached to a fuselage of an aircraft in a manner such that the wing is free to pivot about a spanwise axis forward of its aerodynamic center.
Wolowicz, C. H.
core +1 more source