0
research-article

Experimental investigation of the aerodynamics and flowfield of a NACA 0015 airfoil over a wavy ground

[+] Author and Article Information
Timothy Lee

Department of Mechanical Engineering, McGill University, Montreal, Quebec, Canada H3A 2K6
Tim.Lee@McGill.ca

Vincent Tremblay-Dionne

Department of Mechanical Engineering, McGill University, Montreal, Quebec, Canada H3A 2K6
vincent.tremblay-dionne@mail.mcgill.ca

1Corresponding author.

ASME doi:10.1115/1.4039236 History: Received September 01, 2017; Revised January 17, 2018

Abstract

The aerodynamic properties and flowfield of a NACA 0015 airfoil over a wavy ground were investigated experimentally via surface pressure and particle image velocimetry measurements. Flat-surface results were also obtained to served as a comparison. For the wavy ground, there exhibited a cyclic variation in the sectional lift coefficient Cl over an entire wave length. 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 wave length 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 wave lengths and amplitudes are needed to further quantify the impact of wavy ground on wing-in-ground effect (WIG) airfoils and wings.

Copyright (c) 2018 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In