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Technical Brief

Effect of Trailing-Edge Flap Deflection on a Symmetric Airfoil Over a Wavy Ground

[+] Author and Article Information
V. Tremblay-Dionne, T. Lee

Department of Mechanical Engineering,
McGill University,
Montreal, QC H3A 2K6, Canada

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received July 28, 2018; final manuscript received October 8, 2018; published online December 12, 2018. Assoc. Editor: Moran Wang.

J. Fluids Eng 141(6), 064501 (Dec 12, 2018) (4 pages) Paper No: FE-18-1515; doi: 10.1115/1.4041736 History: Received July 28, 2018; Revised October 08, 2018

The effect of trailing-edge flap (TEF) deflection on the aerodynamic properties and flowfield of a symmetric airfoil over a wavy ground was investigated experimentally. This Technical Brief is a continuation of Lee and Tremblay-Dionne (2018, “Experimental Investigation of the Aerodynamics and Flowfield of a NACA 0015 Airfoil Over a Wavy Ground,” ASME J. Fluids Eng., 140(7), p. 071202) in which an unflapped airfoil was employed. Regardless of the flap deflection, the cyclic variation in the sectional lift Cl and pitching moment Cm coefficients over the wavy ground always persists. The Cm also has an opposite trend to Cl. The flap deflection, however, produces an increased maximum and minimum Cl and Cm with a reduced fluctuation compared to their unflapped counterparts. The Cd increase outperforms the Cl increase, leading to a lowered Cl/Cd of the flapped airfoil.

FIGURES IN THIS ARTICLE
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Copyright © 2019 by ASME
Topics: Deflection , Airfoils
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References

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Figures

Grahic Jump Location
Fig. 1

Schematic diagram of flapped airfoil and wavy ground. h and h′ indicate ground distance refers to unflapped and flapped airfoils, respectively. Measurement positions x0 and x10 correspond to wave peak and x5 corresponds to wave valley.

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Fig. 2

Aerodynamic property over one wavelength at α = 8 deg. (a)–(d) flapped airfoil and (e)–(h) unflapped airfoil.

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Fig. 3

Cp distribution as a function of measurement position: (a) flapped airfoil with h′/c = 5% and (b) unflapped airfoil with h/c = 5%

Grahic Jump Location
Fig. 4

Iso-u/U contours at wave peak (x0) and valley (x5) at selected wavy ground distances of (a)–(d) flapped airfoil, (e)–(h) unflapped airfoil, and (i)–(l) u/U velocity profiles at x0 and x5

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