介电弹性薄膜翼型的增升效应机理

doi:10.7527/S1000-6893.2022.28318

Abstract

Abstract:

Active morphing of bat wings can gain high maneuverability and efficiency in low Reynolds number flow， offering a novel aerodynamic design concept for smart aerocraft. Here， the dielectric elastic high polymer material is directly applied to the design of airfoil. A dielectric elastic membrane airfoil with semi-active control function is proposed based on the aero-electro-structural behaviors of dielectric elastic polymer actuators. The dynamic modeling of membrane wings is established according to the thermodynamics theory to describe complex electromechanical behaviors. As for fluid， a high-fidelity aero-electromagnetic-structural coupling model of the membrane wings is established using the high-precision CFD/CSD coupling technique and is verified afterwards. The results show that the lift of the dielectric elastic membrane airfoil under passive control is 12.33% higher than that of the rigid airfoil at an angle of attack of 14°， and that the contribution ratio of the cambered deformation and vibration effect of the airfoil to the lift enhancement is 3∶2. The dielectric elastic membrane airfoil under semi-active control shows a lift enhancement of more than 10% only at a specific voltage. The methods proposed and research conclusions will provide important technical support for aerodynamics and control design of smart aero-vehicles.

Key words: dielectric elastic membrane airfoil, multiphysical coupling, CFD/CSD coupling, flow control, lift enhancement effect

CLC Number:

V211.3

Wei KANG, Shilin HU, Yanqing WANG. Lift enhancement mechanism of dielectric elastic membrane airfoil[J]. Acta Aeronautica et Astronautica Sinica, 2023, 44(18): 128318-128318.

Figures/Tables 17

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结构参数	数值
弦长/mm	136.6
厚度/mm	0.2
弹性模量/Pa	34 150
结构密度/（kg·m^-3）	402.3
下底面压力载荷/Pa	0.7

结构参数	数值	流体参数	数值
弦长/mm	136.6	来流速度/（m·s^-1）	1.0
厚度/mm	0.2	流体密度/（kg·m^-3）	1.0
弹性模量/Pa	34 150	Re	2 500
结构密度/（kg·m^-3）	402.3	攻角/（°）	4

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Lift enhancement mechanism of dielectric elastic membrane airfoil

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