contributor author | Lee, T. | |
contributor author | Tremblay-Dionne, V. | |
date accessioned | 2019-02-28T10:59:43Z | |
date available | 2019-02-28T10:59:43Z | |
date copyright | 3/13/2018 12:00:00 AM | |
date issued | 2018 | |
identifier issn | 0098-2202 | |
identifier other | fe_140_07_071202.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl1/handle/yetl/4251529 | |
description abstract | Experimental Investigation of the Aerodynamics and Flowfield of a NACA 0015 Airfoil Over a Wavy Ground;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. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | Experimental Investigation of the Aerodynamics and Flowfield of a NACA 0015 Airfoil Over a Wavy Ground | |
type | Journal Paper | |
journal volume | 140 | |
journal issue | 7 | |
journal title | Journal of Fluids Engineering | |
identifier doi | 10.1115/1.4039236 | |
journal fristpage | 71202 | |
journal lastpage | 071202-10 | |
tree | Journal of Fluids Engineering:;2018:;volume( 140 ):;issue: 007 | |
contenttype | Fulltext | |