Mini-TED改变翼型跨声速性能的数值分析

 用数值方法对比分析了NACA0012翼型在微小后缘装置(Mini-TED)打开前后跨声速气动性能的变化，并对其增升机理进行了初步分析。数值结果表明，Mini-TED可以将翼型上表面激波位置大幅度后移，大大提高翼型的升力。在小迎角条件下，Mini-TED后面存在一个由3个旋涡构成的稳定流动结构，正是这个旋涡结构改变了后缘库塔条件，导致上翼面激波位置的变化，进而大幅度提高了升力。当迎角增加后，后缘旋涡结构中的一个旋涡逐渐上移并与激波诱导的分离区合并，从而加速了翼型上表面分离。由于Mini-TED使得迎风面积增加，因而导致升力和阻力同时大幅上升，但总体上看仍然能够大幅度提高升阻比，证明Mini-TED后缘设计是一种极有潜力的新型高升力装置。

Numerical Analysis of Effect of Mini-TED on Aerodynamic Characteristics of Airfoils in Transonic Flow

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...