关键词: 微小后缘装置, 高升力装置, 波涡干扰, 流动控制, 翼型

Abstract: To explore the flow mechanism behind the new type of mini-trailing edge device (Mini-TED) which is first suggested in AWIATOR project, this article compares the change of the transonic performance of NACA0012 with and without Mini-TED. The numerical analysis shows that the shock wave position is postponed greatly when Mini-TED is open, which leads to the increase of the airfoil lift. The mechanism behind this phenomena is that there exists a steady flow structure composed of three vortex behind the trailing edge at low angle of attack, which changes the Kutta condition and therefore the shock wave position. Based on this mechanism, it is reasonable to expect a increase of the drag divergence Mach number. When the angle of attack increases, the three vortex structure destructures and emerges with the separated zone induced by the shock wave, which may lead to the increase of the drag. However, the lift-drag ratio increases greatly, which proves that Mini-TED is a promising high lift device with great potential.

Key words: Mini-TED, high lift device, wavevortex interference, flow control, airfoil