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Acta Aeronautica et Astronautica Sinica ›› 2023, Vol. 44 ›› Issue (18): 128318-128318.doi: 10.7527/S1000-6893.2022.28318

• Fluid Mechanics and Flight Mechanics • Previous Articles     Next Articles

Lift enhancement mechanism of dielectric elastic membrane airfoil

Wei KANG(), Shilin HU, Yanqing WANG   

  1. School of Astronautics,Northwestern Polytechnical University,Xi’an 710072,China
  • Received:2022-11-28 Revised:2022-12-13 Accepted:2022-12-26 Online:2023-09-25 Published:2022-12-27
  • Contact: Wei KANG E-mail:wkang@nwpu.edu.cn
  • Supported by:
    National Natural Science Foundation of China(11972307);Fundamental Research Foundation(JCKY2021204B141)

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

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