CONTROL OF UNSTEADY VORTICAL LIFT ON AN AIRFOIL BY LEADING-EDGE BLOWING-SUCTION

【摘要】 <正> The effects of leading-edge blowing-suction on the vortex flow pastan airfoil at high incidence are investigated numerically by solving the Navier-Stokesequations. The results indicate that the frequency of the flowfield excited by theperiodic blowing-suction locks into the forcing frequency, which is half of the dominantfrequency for the flow past a fixed airfoil without injection. In that case, a well-developed primary leading-edge vortex occupies the upper surface of the airfoil andthe largest lift augmentation is obtained.更多还原

【Abstract】 The effects of leading-edge blowing-suction on the vortex flow past an airfoil at high incidence are investigated numerically by solving the Navier-Stokes equations. The results indicate that the frequency of the flowfield excited by the periodic blowing-suction locks into the forcing frequency, which is half of the dominant frequency for the flow past a fixed airfoil without injection. In that case, a well- developed primary leading-edge vortex occupies the upper surface of the airfoil and the largest lift augmentation is obtained.更多还原