大湍流度对超低雷诺数下翼型受力及绕流的影响

实验测量了超低雷诺数(Re=5 300)下 NACA 0012翼型在自由来流下的升力系数和阻力系数,重点研究来流的湍流度对升力系数和阻力系数的影响,并进一步通过对翼犁流场的研究揭示湍流度对翼型受力产生影响的机理.结果显示,低湍流度下升力系数和阻力系数均无失速特征;当湍流度提高,升力系数和阻力系数在12°～15°迎角下表...

Effect of Large Turbulence Intensity on Airfoil Load and Flow

The present study measures the lift and drag coefficients of airfoil NACA 0012 at ultra-low Reynolds number (Re=5 300) in an experiment. The investigation focuses on the free-stream turbulence intensity effect on airfoil lift coefficient and dray coefficient, and further explains this effect through a discussion of turbulence intensity influence on airfoil flow. The measured results indicate that, while airfoil stall does not occur in lift coefficient and drag coefficient for low turbulence intensity, it is clearly present for high turbulence intensity. For airfoil NACA 0012 and high turbulence intensity, the stall occurs at angles of attack from 12° to 15°. As demonstrated by the flow visualization around the airfoil, the influence of turbulence intensity is significant on both the airfoil boundary layer and the separated shear layer, so that the airfoil performance differs at different turbulence intensity. In addition, the influence of the increase of turbulence intensity and Re appears to be similar on the airfoil load characteristic and flow regime.