Compressible Dynamic Stall Control using a Variable Droop Leading Edge Airfoil [PDF]
, 2016 (AIAA Paper 2003-0048), Journal of Aircraft, Vol. 41, No. 4, pp. 862-969, Jul. - Aug. 2004.The control of compressible dynamic stall using a variable droop leading edge airfoil is described.
Chandrasekhara, M.S. +2 more
core
Evaluation of a stall-flutter spring-damper pushrod in the rotating control system of a CH-54B helicopter [PDF]
Results of a design and flight test program conducted to define the effect of rotating pushrod damping on stall-flutter induced control loads are presented.
Adams, D. O. +2 more
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Extension of the discontinuous Galerkin finite element method to viscous rotor flow simulations [PDF]
, 2005 Heavy vibratory loading of rotorcraft is relevant for many operational aspects of helicopters, such as the structural life span of (rotating) components, op- erational availability, the pilot’s comfort, and the ef- fectiveness of weapon targeting systems.
Boelens, O.J. +3 more
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Investigation of Flow Field in Deep Dynamic Stall over an Oscillating NACA 0012 Airfoil
Journal of Applied Fluid Mechanics, 2019 This paper presents the investigation on the phenomenon of a deep dynamic stall at the Reynolds number of the order of 105 over an oscillating NACA 0012 model.
D. Surekha R. S. +2 more
doaj
Analysis of unswept and swept wing chordwise pressure data from an oscillating NACA 0012 airfoil experiment. Volume 1: Technical Report [PDF]
The unsteady chordwise force response on the airfoil surface was investigated and its sensitivity to the various system parameters was examined. A further examination of unsteady aerodynamic data on a tunnel spanning wing (both swept and unswept ...
Carta, F. O., St.hilaire, A. O.
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A Cross-Validation Approach to Approximate Basis Function Selection of the Stall Flutter Response of a Rectangular Wing in a Wind Tunnel [PDF]
, 2012 The stall flutter response of a rectangular wing in a low speed wind tunnel is modelled using a nonlinear difference equation description. Static and dynamic tests are used to select a suitable model structure and basis function.
Andrianne, Thomas +4 more
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Closed-Loop Dynamic Stall Control Using a Stall-Warning Sensor
A closed-loop dynamic stall control system, employing a pulsed dielectric barrier discharge (DBD) plasma actuator, was implemented on the semi-span wing of a 6:1 scale general aviation aircraft model, and evaluated in a wind tunnel. Sensing of incipient stall was achieved by means of a pressure port located just below the leading-edge, inspired by ...
Mordechai Garcia +2 more
openaire +1 more source
Nonlinear problems in flight dynamics involving aerodynamic bifurcations [PDF]
Aerodynamic bifurcation is defined as the replacement of an unstable equilibrium flow by a new stable equilibrium flow at a critical value of a parameter.
Chapman, G. T., Tobak, M.
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Dynamic Stall Control: A Review
The control of dynamic stall associated with wind turbine and helicopter blades, fixed-wings, flapping wings, as well as alternating flow separation and attachment produced by cyclical control inputs, is reviewed. Different airfoil and wing stall types are described, control metrics are identified, and the generality of harmonic pitch oscillations is ...
openaire +1 more source
Development of drive mechanism for an oscillating airfoil [PDF]
The design and development of an in-draft wind tunnel test section which will be used to study the dynamic stall of airfoils oscillating in pitch is described.
Sticht, Clifford D.
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