Separation control by self-activated movable flaps
Separation control by self-activated movable flaps
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DOI：
10.2514/1.23507
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发表时间：
2007-01-01
期刊：
影响因子：
2.5
通讯作者：
Thiele, Frank
中科院分区：
文献类型：
--
作者：
Meyer, Robert;Hage, Wolfram;Thiele, Frank
分离控制是鸟类飞行生理学中的一个重要问题。文中详细介绍了鸟毛分离控制机构如何适应工程应用的要求。自动活动襟翼类似于人造鸟类的羽毛，代表了一种增加翼型最大升力的高升力系统。通过数值模拟和实验研究相结合的方法研究了它们对二维翼型非定常绕流的影响。首先，对襟翼的自动启闭机构进行了研究。在此基础上，研究了不同入射角和襟翼形状对升力的有利影响。通过对实验和数值结果的深入分析，详细描述了自调整襟翼对翼型绕流的重要现象和影响。在本文的第二部分，通过与基于非定常雷诺平均Navier-Stokes方程和大涡模拟的混合模拟结果的比较，验证了非定常流动统计湍流模型的适用性，特别是湍流时间尺度。最后，介绍了在层流机翼上安装了可移动襟翼的飞机的飞行实验。
Separation control is an important issue in the physiology of birdflight. Here, the adaption of the separation control mechanism by bird feathers to the requirements of engineering applications is described in detail. Self-activated movable flaps similar to artificial bird feathers represent a high-lift system for increasing the maximum lift of airfoils. Their effect on the unsteady flow around a two-dimensional airfoil configuration is investigated by a joint numerical and experimental study. First, attention is paid to the automatic opening and closing mechanism of the flap. Following this, its beneficial effect on lift is investigated for varying incidences and flap configurations. In-depth analysis of experimental and numerical results provides a detailed description of the important phenomena and the effect of self-adjusting flaps on the flow around the airfoil. In the second part of this paper, a contribution is made to verification of the applicability of unsteady Reynolds-averaged approaches using statistical turbulence models for unsteady flows with particular attention to turbulent time scales with comparison to the results of a hybrid simulation based on unsteady Reynolds-averaged Navier-Stokes equations and large-eddy simulation. Finally, flight experiments are described using an aircraft with movable flaps fitted on its laminar wing.