后缘装置LET对多段翼型气动特性的影响研究

采用求解N-S方程的方法,分别对安装后缘装置(Lift Enhancing Tabs,LET)中的传统形式Gurney襟翼(Gurney Flap,GF)和新型后缘装置(Mini-Trailing Edge Device,Mini-TED)后的多段翼型气动特性进行了分析研究。以带有30%弦长富勒襟翼的NACA632-215B两段高升力翼型为基础,分析了不同安装位置的GF对气动特性的影响。结果表明,在中等襟翼偏角下主翼尾缘安装GF对气动特性是不利的,而GF在襟翼尾缘的安装则有实际应用的可能。针对某真实飞机起飞、着陆构型多段翼型,研究了襟翼后缘不同偏角的Mini-TED对气动特性的影响。计算结果表明,通过对Mini-TED安装偏角的优化,对于不同的构型和飞行状态可以增大其改善飞机气动特性的使用范围。

Computational investigation of lift-enhancing tabs on multi-element airfoils

The aerodynamic properties of the multi-element airfoils equipped with the Lift-Enhancing Tabs including the conventional Gurney flap and the Mini-TED are investigated based on solving the N-S equations in this paper.The effects of the Gurney flap have been studied on different elements of the two-element high-lift airfoil,which is NACA632-215 ModB airfoil with a 30% chord fowler flap.It’s found that when the flap angle is moderate,Gurney flap on the main element of the airfoil is adverse for the aerodynamic properties while it is practical to be on flap element.Based on the multi-element airfoils of the takeoff configuration and the landing configuration of an actual airplane,the effects of different deflection angles of the Mini-TED on the flap trailing edge have been studied in this paper.The results show that in order to enhance the aerodynamic performances of the multi-element airfoil,the deflection angle of the Mini-TED should be optimized according to the flight conditions.