Effects of membrane pre-stress on the aerodynamic characteristics of an elasto-flexible morphing wing
Effects of membrane pre-stress on the aerodynamic characteristics of an elasto-flexible morphing wing
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DOI：
10.1016/j.ast.2014.05.005
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发表时间：
2014-08-01
影响因子：
5.6
通讯作者：
Breitsamter, Christian
中科院分区：
文献类型：
--
作者：
Beguin, Benoit;Breitsamter, Christian
本文考虑亚音速无人机应用的变形机翼概念的实验研究，它是由一个弹性-柔性膜跨越铰接结构，以允许大的变化的平面形状的几何形状。由于其大的灵活性，机翼表面变形时，受到气动载荷和机翼弯度被动地取决于流动条件。在这种情况下，本研究的重点是薄膜预应力的变化，以影响其偏转和控制机翼外倾角的潜力。基于风洞模型的基线版本，通过移动后缘翼梁来实现预应力修改。在几种动压下进行的力和变形测量的结果表明，在给定的流动条件下，有效地改变预应力允许影响机翼表面的被动变形，并在一定范围内调整机翼的外倾角。这反过来又可以用来调整空气动力学性能，并提高升阻比相比，基线模型的预应力是恒定的。(C)2014年Elsevier Masson SAS。All rights reserved.
This paper considers the experimental investigation of a morphing wing concept for subsonic UAV application, which is made up of an elasto-flexible membrane spanned over an articulated structure to allow large variations of the planform geometry. Due to its large flexibility, the wing surface deforms when subjected to aerodynamic loads and the wing camber depends passively on the flow conditions. In this context, the present study focuses on the potential of a variation of the membrane pre-stress to influence its deflection and control the wing camber. Based on a baseline version of the wind tunnel model, the pre-stress modification is achieved by moving the trailing-edge spar. The results of force and deformation measurements performed at several dynamic pressures indicate that varying the pre-stress effectively allows to influence the passive deformation of the wing surface and adjust the wing camber within a certain range at a given flow condition. This in turn can be used to adjust the aerodynamic performance and improve the lift-to-drag ratio compared to the baseline model where the pre-stress is constant. (C) 2014 Elsevier Masson SAS. All rights reserved.