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俄罗斯空气动力研究所中心学报

ISSN 打印: 1948-2590
ISSN 在线: 1948-2604

俄罗斯空气动力研究所中心学报

DOI: 10.1615/TsAGISciJ.2014010855
pages 627-637

EFFECT OF AIRFOIL SHAPE WAVINESS ON ITS AERODYNAMIC CHARACTERISTICS AT LOW SUBSONIC SPEEDS

Murad Abramovich Brutyan
Central Aerohydrodynamic Institute (TsAGI), 1 Zhukovsky Str., Zhukovsky 140180, Russia
Natalya Alekseevna Vladimirova
Central Aerohydrodynamic Institute (TsAGI), 1 Zhukovsky Str., Zhukovsky 140180, Russia
Aleksandr Vladimirovich Potapchik
Central Aerohydrodynamic Institute (TsAGI), 1 Zhukovsky Str., Zhukovsky 140180, Russia

ABSTRACT

The results of comparative numerical and experimental investigations of the aerodynamic characteristics of National Advisory Committee for Aeronautics (NACA) 0012 airfoil and modified NACA 0012m airfoil are provided. The modified airfoil differs from the original one in that its diffuser part, starting from the position of maximum thickness, is a wavy surface. The systematic calculations of the wave optimal parameters have been made by a computer code based on the panel method for airfoil subsonic flow calculation with viscous/inviscid interaction. A standard load experiment has been carried out in a wide range of incidence angles α = 0−22° in the T-106M wind tunnel at TsAGI with rectangular wings of the aspect ratio equal to 5 at Reynolds number Re = 2 × 106 and Mach number M = 0.3. It is found that the presence of a small streamwise waviness (not higher than 0.1−0.2% of the airfoil chord) on the airfoil surface leads to retardation of separation phenomena and a lift coefficient increase at large angles of attack for the modified airfoil compared with the original airfoil.


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