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research-article

Effect of Gurney Flaps on an Elliptical Airfoil

[+] Author and Article Information
Lance W. Traub

Embry Riddle Aeronautical University Prescott AZ 86301, USA
traubl@erau.edu

1Corresponding author.

ASME doi:10.1115/1.4037037 History: Received July 11, 2016; Revised May 02, 2017

Abstract

A low speed wind tunnel investigation is presented characterizing the impact of Gurney flaps on an elliptical airfoil. The chordwise attachment location and height of the flaps were varied, as was the Reynolds number. The results showed strong non-linearities in the lift curve which were present for all tested geometries. Flap effectiveness was seen to diminish as the flap was moved closer to the trailing edge stemming from flap submersion in separated flow. For the tested cases, the measured lift coefficients showed a weak Re dependency. The upper airfoil surface was shown to carry approximately 80% of the total lift load. The top surface caused a pitching moment reversal associated with non-linearity in the lift curve.

Copyright (c) 2017 by ASME
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