Journal ArticleDOI
Gurney Flap Experiments on Airfoils, Wings, and Reflection Plane Model
TLDR
In this article, the effect of Gurney e aps on two-dimensional airfoils, three-dimensional wings, and a ree ection plane model were investigated, and the results showed that the Gurny e ap improved the maximum lift coefe cient compared to the baseline clean cone guration.Abstract:
The effect of Gurney e aps on two-dimensional airfoils, three-dimensional wings, and a ree ection plane model were investigated. There have been a number of studies on Gurney e aps in recent years, but these studies have been limited to two-dimensional airfoil sections. A comprehensive investigation on the effect of Gurney e aps for a wide range of cone gurations and test conditions was conducted at Wichita State University. A symmetric NACA 0011 and a cambered GA (W)-2 airfoil were used during the single-element airfoil part of this investigation. The GA (W)-2 airfoil was also used during the two-element airfoil study with a 25% chord slotted e ap dee ected at 10, 20, and 30 deg. Straight and tapered ree ection plane wings with natural laminar e ow (NLF) airfoil sections were tested for the three-dimensional wing part of this investigation. A fuselage and engine were attached to the tapered NLF wing for the ree ection plane model investigation. In all cases the Gurney e ap improved the maximum lift coefe cient compared to the baseline clean cone guration. However, there was a drag penalty associated with this lift increase.read more
Citations
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Journal ArticleDOI
Aerodynamics of Gurney Flaps on a Single-Element High-Lift Wing
TL;DR: In this article, a single-element wing fitted with Gurney flaps has been studied, and the authors found that the wake consists of a von Karman vortex street of alternately shed vortices.
Journal ArticleDOI
Gurney flap—Lift enhancement, mechanisms and applications
TL;DR: A review of the characteristics and mechanisms of lift enhancement by the Gurney flap and its applications can be found in this article, where the authors also discuss the application of the GURNey flap to modern aircraft design.
Journal ArticleDOI
Ground Effect Aerodynamics of Race Cars
TL;DR: In this paper, the progress made during the last thirty years on ground effect aerodynamics associated with race cars, in particular open wheel race cars is reviewed and discussed, and the role played by force enhancement edge vortices is demonstrated.
Journal ArticleDOI
Shark skin-inspired designs that improve aerodynamic performance
August G. Domel,Mehdi Saadat,James C. Weaver,Hossein Haj-Hariri,Katia Bertoldi,George V. Lauder +5 more
TL;DR: A set of denticle-inspired surface structures are discovered that achieve simultaneous drag reduction and lift generation on an aerofoil, resulting in lift-to-drag ratio improvements comparable to the best-reported for traditional low-profile vortex generators and even outperforming these existing designs at low angles of attack with improvements of up to 323%.
Journal ArticleDOI
Experimental Investigation of Gurney Flaps
Mark D. Maughmer,Götz Bramesfeld +1 more
TL;DR: In this paper, the aerodynamics of a Gurney-flap-equipped airfoil have been explored by means of low-speed wind-tunnel experiments performed at a chord Reynolds number of 1:0 10.
References
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Theory of Wing Sections
TL;DR: Chang et al. as discussed by the authors proposed a new geometric analysis procedure for wing sections based on the normal mode analysis for continuous functions, which can be used to calculate the section length.
Journal ArticleDOI
Design of Subsonic Airfoils for High Lift
TL;DR: In this article, the authors defined the upper surface lift coefficient of an airfoil chord and defined the freestream conditions at the leading edge of the chord line, and the ratio of specific heats.
Journal ArticleDOI
Lift enhancement of an airfoil using a Gurney flap and vortex generators
Bruce L. Storms,Cory S. Jang +1 more
TL;DR: In this article, surface pressure distributions and wake profiles were obtained for an NACA 4412 airfoil to determine the lift, drag, and pitching-moment coefficients for various configurations.
A water tunnel study of Gurney flaps
TL;DR: Several Gurney flap configurations were tested in the NASA Langley 16 x 24 inch Water Tunnel as mentioned in this paper, and the results showed that the effect of the flaps on the recirculation region behind the flap was consistent with hypotheses stated in previous research.