Lift enhancement and flow structure of airfoil with joint trailing-edge flap and Gurney flap

2010 ◽  
Vol 50 (6) ◽  
pp. 1671-1684 ◽  
Author(s):  
T. Lee ◽  
Y. Y. Su
Keyword(s):  
Flow Structure ◽  
Trailing Edge ◽  
Gurney Flap ◽  
Trailing Edge Flap ◽  
Lift Enhancement

scholarly journals A comparative assessment of vibration control capabilities of a L-shaped Gurney flap

2016 ◽  
Vol 120 (1233) ◽  
pp. 1812-1831 ◽  
Author(s):  
V. Motta ◽  
G. Quaranta
Keyword(s):  
Vibration Reduction ◽  
Rotor Blades ◽  
Vertical Force ◽  
Trailing Edge ◽  
Helicopter Blade ◽  
Reduced Frequency ◽  
Gurney Flap ◽  
Alternative Means ◽  
Higher Harmonic Control ◽  
Trailing Edge Flap

ABSTRACTThis work presents the capabilities of a novel L-shaped trailing-edge Gurney flap as a device for vibration reduction. The primary effect of this L-tab is represented by a modification of the reference aerofoil mean line shape through by two counter-rotating vortical structures created at the trailing edge. The comparison of the aerodynamic loads generated by the novel L-tab Gurney flap and a classical trailing-edge flap allows to estimate the ranges of reduced frequency where the L-tab is expected to perform better than a trailing edge flap and vice versa. Linear aerostructural models for a typical section representative of a helicopter blade equipped with a partial-span L-tab or a trailing-edge flap are built, and a higher harmonic control algorithm is applied. Performance are compared between the two devices to reduce separately the N/rev harmonics of the blade root rotating frame vertical force, flapping and feathering moments. The attainment of similar results with classical trailing-edge device is a further confirmation of the potential feasibility of this novel L-tab as an effective alternative means for vibration reduction on rotor blades.

Iterative Learning Control for Trailing-Edge Flap Lift Enhancement with Pulsed Blowing

AIAA Journal ◽  
2015 ◽  
Vol 53 (7) ◽  
pp. 1969-1979 ◽  
Author(s):  
Zhonglun Cai ◽  
David Angland ◽  
Xin Zhang ◽  
Peng Chen
Keyword(s):  
Iterative Learning Control ◽  
Learning Control ◽  
Iterative Learning ◽  
Trailing Edge ◽  
Trailing Edge Flap ◽  
Lift Enhancement

Performance enhancement evaluation of an actuated trailing edge flap

2001 ◽  
Vol 105 (1049) ◽  
pp. 391-399 ◽  
Author(s):  
W. Chan ◽  
A. Brocklehurst
Keyword(s):  
Adverse Effect ◽  
Performance Enhancement ◽  
Optimal Configuration ◽  
Analytical Evaluation ◽  
Trailing Edge ◽  
Design Constraints ◽  
Flight Condition ◽  
Trailing Edge Flap

Abstract An analytical evaluation of the performance enhancement due to a servo-actuated trailing edge flap was carried out using the coupled rotor-fuselage model (CRFM). The performance enhancement from a trailing edge flap is achieved by introducing effective camber around the azimuth for a nominal aerofoil. An investigation on the best combination of flap parameters, namely the span, position, chord and deflection was carried out in order to identify an optimal configuration within given design constraints. The effects on vibratory control loads over a range of speed for a flap of 10% span, 20% chord, actuated at once per rev has expanded the retreating blade envelope for a Lynx aircraft by some 20kt. The flap hinge load was also examined and it was found not to be excessive. It was also confirmed that an actuated trailing edge flap does not have adverse effect on the pilot's control inputs to trim to a particular flight condition. This paper will discuss the aerodynamic enhancements derived from the application of the trailing edge flap and present conclusions drawn from this study.

Upper Trailing-Edge Flap for Transonic Buffet Control

2018 ◽  
Vol 55 (1) ◽  
pp. 382-389 ◽  
Author(s):  
Y. Tian ◽  
Z. Li ◽  
P. Q. Liu
Keyword(s):  
Trailing Edge ◽  
Trailing Edge Flap ◽  
Transonic Buffet
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