Lift enhancement mechanism study of the airfoil with a dielectric elastic membrane skin

IF 3.4 2区工程技术 Q1 ENGINEERING, MECHANICAL

Journal of Fluids and Structures Pub Date : 2024-02-06 DOI:10.1016/j.jfluidstructs.2024.104083

Wei Kang, Shilin Hu, Yanqing Wang

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Abstract

Lift enhancement mechanism of an airfoil with the dielectric elastic membrane skin is studied numerically for smart flow control. The flexible membrane is made of dielectric highly elastic polymer material. Such kind of material can deform and oscillate under the prescribed electric potential difference. The dynamic modeling of the dielectric elastic structure is established to describe the electromechanical behaviors. A high-fidelity aero-electromagnetic-structural coupling model is proposed and verified based on CFD/CSD coupling technique. The aerodynamic characteristics of the airfoil with the dielectric elastic membrane skin is analyzed at various angles of attack. The results show that the lift coefficient of the airfoil is 12.33% higher than that of the rigid airfoil at AOA=14°. The effects of coupling oscillation and applied voltages on the aerodynamic performance of the airfoil are emphasized. In the nonlinear coupling, the high-order lock-in frequency plays a significant role in lift enhancement. The lift coefficient is greatly improved when the second-order frequency lock-in occurs and the second-order lock-in frequency is no less than the second-order fundamental frequency of the flow past the rigid airfoil. The corresponding flow pattern is characterized with the formation and maintain of the vortices with similar scale.

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带介电弹性膜蒙皮机翼的升力增强机理研究

对带有介电弹性膜蒙皮的机翼的升力增强机制进行了数值研究，以实现智能流动控制。弹性膜由介电高弹性聚合物材料制成。这种材料可以在规定的电势差下变形和振荡。建立了介电弹性结构的动态模型来描述其机电行为。基于 CFD/CSD 耦合技术，提出并验证了高保真航空电磁结构耦合模型。分析了带有介电弹性膜表皮的机翼在不同攻角下的气动特性。结果表明，在 AOA=14° 时，该机翼的升力系数比刚性机翼高 12.33%。耦合振荡和外加电压对机翼气动性能的影响得到了强调。在非线性耦合中，高阶锁定频率对升力增强起着重要作用。当发生二阶频率锁定时，升力系数会大大提高，并且二阶锁定频率不低于流过刚性机翼的二阶基频。相应的流型特征是形成和保持类似尺度的涡旋。

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来源期刊

Journal of Fluids and Structures 工程技术-工程：机械

CiteScore

6.90

自引率

8.30%

发文量

173

审稿时长

65 days

期刊介绍： The Journal of Fluids and Structures serves as a focal point and a forum for the exchange of ideas, for the many kinds of specialists and practitioners concerned with fluid–structure interactions and the dynamics of systems related thereto, in any field. One of its aims is to foster the cross–fertilization of ideas, methods and techniques in the various disciplines involved. The journal publishes papers that present original and significant contributions on all aspects of the mechanical interactions between fluids and solids, regardless of scale.