An Experimental Investigation of the Aerodynamic Effects of Forward Facing Wedges on the Upper Surface and Leading Edge of an Aerofoil, with Emphasis at High Angles of Attack

An Experimental Investigation of the Aerodynamic Effects of Forward Facing Wedges on the Upper Surface and Leading Edge of an Aerofoil, with Emphasis at High Angles of Attack
Author: A. P. Brown
Publisher:
Total Pages: 12
Release: 1983
Genre: Aerofoils
ISBN: 9780642078797
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Wind tunnel tests were carried out to determine the effect on the longitudinal aerodynamic characteristics of a two-dimensional aerofoil fitted with descrete forward-facing wedges (base to aerofoil chord ratio 0.24 and 0.39) at the leading edge and on the upper surface of the aerofoil. The forward-facing wedges were conceived as a means of delaying stall and enhancing lift at high incidence. Thus these may be useful in low speed flight (approach and landing) where they would be extended from the clean wing surface along with the trailing edge flaps. Tests were conducted at Mach numbers 0.2/0.3, over an incidence range of -10 to +20 degrees. Corresponding chord Reynolds numbers were 0.57 and 0.84 million (compared to an inflight value of 2.5 million for a wing of chord 1.25 metres and airspeed of 60 knots). The results at M=0.2 are more extensive than those at M=0.3.

Low Reynolds Number Aerodynamics

Low Reynolds Number Aerodynamics
Author: Thomas J. Mueller
Publisher: Springer Science & Business Media
Total Pages: 456
Release: 2013-03-08
Genre: Science
ISBN: 3642840108
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Current interest in a variety of low Reynolds number applications has focused attention on the design and evaluation of efficient airfoil sections at chord Reynolds numbers from about 100,000 to about 1,000,000. These applications include remotely piloted vehicles (RPVs) at high altitudes, sailplanes, ultra-light man-carrying/man powered aircraft, mini-RPVs at low altitudes and wind turbines/propellers. The purpose of this conference was to bring together those researchers who have been active in areas closely related to this subject. All of the papers presented are research type papers. Main topics are: Airfoil Design and Analysis, Computational Studies, Stability and Transition, Laminar Separation Bubble, Steady and Unsteady Wind Tunnel Experiments and Flight Experiments.

Theoretical and Experimental Investigation of the Aerodynamic Properties of Airfoils Near Stall in a Two

Theoretical and Experimental Investigation of the Aerodynamic Properties of Airfoils Near Stall in a Two
Author: G. R. Ludwig
Publisher:
Total Pages: 118
Release: 1966
Genre:
ISBN:
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A theoretical method, which requires the use of a digital computer, was developed to predict pressure distributions on an airfoil in an inviscid two-dimensional monuniformly sheared flow. The theory is applicable to airfoils of arbitrary profile and to nonuniformly sheared flows which can be represented by segments with linear velocity profiles. To test the developed theory, aerodynamic characteristics of an airfoil were investigated both theoretically and experimentally in a relatively simple two-dimensional nonuniformly sheared flow consisting of two segments with shears of equal magnitude but of opposite sign. Agreement between computed and experimental pressure distributions was good and on the basis of these results, a mechanism is postulated by which the large variations in lift previously observed in a two-dimensional nonuniformly sheared flow can occur. (Author).