The aerodynamic properties and flowfield of a NACA 0015 airfoil over a wavy ground were investigated experimentally via surface pressure and particle image velocimetry (PIV) measurements. Flat-surface results were also obtained to be served as a comparison. For the wavy ground, there exhibited a cyclic variation in the sectional lift coefficient Cl over an entire wavelength. The maximum Cl observed at the wave peak (produced by the wavy ground-induced RAM pressure) and minimum Cl occurred at the wave valley (resulting from the unusual suction pressure developed on the airfoil's lower surface due to the converging-diverging flow passage developed underneath it) reduced with increasing ground distance. By contrast, the pitching-moment coefficient showed an opposite trend to the variation in Cl and had an almost all-negative value. Meanwhile, two peak values in the drag coefficient over each wavelength were observed. The wavy ground effect-produced gains in the mean Cl and lift-to-drag ratio were at the expense of longitudinal stability. Additional measurements considering different wavelengths and amplitudes are needed to further quantify the impact of wavy ground on wing-in-ground effect (WIG) airfoils and wings.
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July 2018
Research-Article
Experimental Investigation of the Aerodynamics and Flowfield of a NACA 0015 Airfoil Over a Wavy Ground
T. Lee,
T. Lee
Department of Mechanical Engineering,
McGill University,
Montreal, QC H3A 2K6, Canada
McGill University,
Montreal, QC H3A 2K6, Canada
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V. Tremblay-Dionne
V. Tremblay-Dionne
Department of Mechanical Engineering,
McGill University,
Montreal, QC H3A 2K6, Canada
McGill University,
Montreal, QC H3A 2K6, Canada
Search for other works by this author on:
T. Lee
Department of Mechanical Engineering,
McGill University,
Montreal, QC H3A 2K6, Canada
McGill University,
Montreal, QC H3A 2K6, Canada
V. Tremblay-Dionne
Department of Mechanical Engineering,
McGill University,
Montreal, QC H3A 2K6, Canada
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 September 1, 2017; final manuscript received January 17, 2018; published online March 13, 2018. Assoc. Editor: Moran Wang.
J. Fluids Eng. Jul 2018, 140(7): 071202 (10 pages)
Published Online: March 13, 2018
Article history
Received:
September 1, 2017
Revised:
January 17, 2018
Citation
Lee, T., and Tremblay-Dionne, V. (March 13, 2018). "Experimental Investigation of the Aerodynamics and Flowfield of a NACA 0015 Airfoil Over a Wavy Ground." ASME. J. Fluids Eng. July 2018; 140(7): 071202. https://doi.org/10.1115/1.4039236
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