Results 161 to 170 of about 16,699 (209)

Flap Architecture by Morphing Trailing Edges

International Journal of Current Engineering and Technology, 2010
This paper proposes flap architecture for a variable camber trailing edge, whose reference geometry is based on a full scale wing for a regional transport aircraft. The compliant rib is based on a truss-like structure where some members are active rods made of Shape Memory Alloy (SMA).
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Morphing Trailing Edge Flap for High Lift Wing

52nd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference, 2011
This paper presents the study conducted to design and analyze a morphing trailing edge flap structure for a large aircraft wing. The rear part of the trailing edge flap was modified to be integrated with a set of internal actuation mechanisms distributed along the span of the flap. Additional changes to the conventional flap structure were implemented,
Natalia Di Matteo, Shijun Guo
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Drag Reduction on Gurney Flaps and Divergent Trailing Edges

2001
Miniflaps at the trailing edges of airfoils (e.g., Gurney flaps or divergent trailing edges) change the Kutta condition and thus produce higher lift. Unfortunately, however, the drag is also increased due to the flow separation downstream of this particular type of trailing edge.
Meyer, R., Bechert, D. W., Hage, W.
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Gust alleviation using rapidly deployed trailing-edge flaps

Journal of Wind Engineering and Industrial Aerodynamics, 2010
Abstract This paper presents the results of a numerical and experimental investigation into the use of a small, rapidly actuated, actively controlled trailing-edge flap (4% chord) to alleviate the unsteady loading experienced by wind turbine blades due to atmospheric turbulence and the atmospheric boundary layer.
M. Frederick, E.C. Kerrigan, J.M.R. Graham   +2 more
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Adaptive Trailing Edge Flap Placement

2014
The chapter proposes a smart rotor configuration for the NREL 5 MW turbine with Adaptive Trailing Edge Flaps (ATEF) on each of the blades. Flaps with the aerodynamic proprieties presented in the previous chapter are included in the HAWC2 model of the wind turbine, and aeroelastic simulations are performed to determine the blade root flapwise bending ...
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Trailing-Edge Flap Control of Dynamic Pitching Moment

AIAA Journal, 2007
The effects of upward ramp rate, actuation start time, and duration of a moveable trailing-edge flap on the critical aerodynamic values of an oscillating wing were investigated. The largest improvement in the peak negative pitching moment was obtained with a fast ramp rate and a start time near the mean angle. The largest value of net work coefficient,
P. Gerontakos, T. Lee
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Trailing-edge flap flow control for dynamic stall

The Aeronautical Journal, 2011
AbstractResults of a series of oscillatory dynamic stall tests of a rotor aerofoil fitted with a pulsed, trailing-edge flap are presented. Flap deflection amplitude, motion profile, duration and starting phase were investigated to assess the potential of the flap for mitigating the adverse effects of dynamic stall, which is one of the limiting factors ...
R. B. Green, E. A. Gillies, Y. Wang
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Nonlinear control of PZT-actuated trailing edge flaps

SPIE Proceedings, 1999
While PZT exhibits only mild nonlinear response at low voltage levels, it is well-known that the response can be profoundly nonlinear at high field strengths. Moreover, the use of mechanical linkages and structural design to amplify the stroke of PZT-based actuation likewise can couple with this material nonlinearity to yield a structural level ...
Andrew J. Kurdila, Jing Li, Mark V. Fulton, Glenn V. Webb   +3 more
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A Numerical Study of Flapping Plates Hinged with a Trailing-Edge Flap

32nd AIAA Applied Aerodynamics Conference, 2014
In current work, effects of a controllable trailing-edge flap (TEF) on hovering flapping plates at low Reynolds number is computationally investigated. The leading-edge portion of flapping plate is driven by a prescribed kinematics in a horizontal stroke plane.
Yan Ren, Chengyu Li, Haibo Dong
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Pitching Airfoil with Combined Gurney Flap and Unsteady Trailing-Edge Flap Deflection

AIAA Journal, 2012
b = semispan c = airfoil chord Cl = lift coefficient Cm = pitching moment coefficient Cp = surface pressure coefficient f = oscillation frequency h = Gurney flap height td = flap actuation duration ts = flap actuation start time u1 = freestream velocity = angle of attack ds = dynamic-stall angle f = final angle i = initial angle ss = static stall angle
T. Lee, Y. Y. Su
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