微型后缘装置增升效率及几何参数影响研究

 为满足现代大型飞机增升装置简洁高效的设计需求,以典型三段翼型为对象,采用数值模拟研究在后缘襟翼上增加微型后缘装置(mini-TED)以提高增升装置效率的可行性;给出了微型后缘装置的作用原理,获得了微型后缘装置位置、长度、偏度等几何参数对增升和升阻性能的影响规律。研究结果表明:微型后缘装置明显改变了襟翼后缘弯度,对襟翼流动产生有利诱导作用,拓展加长了增升装置的有效"气动弦长",是一种附加气动襟翼。其几何参数设计原则是:以长度l≤1.5%c(c为干净翼型弦长)、位于95%襟翼弦向位置前较为合适;偏度则可根据起降等飞行状态进行选择。与四段及其以上增升装置相比,微型后缘装置具有增升效果显著、结构简单、附加重量小和易于工程实现等优点,是一种极具潜力的新型增升技术,具有深入的研究价值和良好的应用前景。

Investigation on Mini-TED Efficiency and Impact of Its Geometrical Parameters

In order to meet the design requirements of high lift system with high efficiency and simple structure for modern large aircraft,this paper selects a typical three element airfoil,and,based on numerical simulation,studies the feasibility of mini-trailing edge device(mini-TED) to improve the aerodynamic performance of the lift system and analyzes its physical mechanism and the impact of its geometrical parameters,including the mini-TED fixing position,length and deflection angle.The study shows that the mini-TED changes the curvature of the trailing edge and increases the effective aerodynamic chord length for a high lift system,acting like an additional aerodynamic flap.Mini-TED with geometrical parameters of length l≤1.5%c(c is the chord length) and fixing position before 95% length of the flap is suitable,and its deflection angle can be adjusted based on different flying states.Compared with the four or more element high lift system,mini-TED features remarkable lift enhancement effect,simple structure,light additional height,and easy application in engineering.It possesses attractive potential as a new lift enhancement technique.