Numerical simulations are performed to investigate the influence of crosswind on the aerodynamic characteristics of rigid dragonfly-like flapping wings through the solution of the three-dimensional unsteady Navier-Stokes equations. The aerodynamic forces, the moments, and the flow structures of four dragonfly wings are examined when the sideslip angle ϑ between the crosswind and the flight direction varied from 0o to 90o. The stability of the dragonfly model in crosswind is analyzed. The results show that the sideslip angle ϑ has a little effect on the total time-average lift force but significant influence on the total time-average thrust force, lateral force, and three-direction torques. An increase in the sideslip angle gives rise to a larger total time-average lateral force and yaw moment. These may accelerate the lateral skewing of the dragonfly, and the increased rolling and pitching moments will further aggravate the instability of the dragonfly model. The vorticities and reattached flow on the wings move laterally to one side due to the crosswind, and the pressure on wing surfaces is no longer symmetrical and hence, the balance between the aerodynamic forces of the wings on two sides is broken. The effects of the sideslip angle ϑ on each dragonfly wing are different, e.g., ϑ has a greater effect on the aerodynamic forces of the hind wings than those of the fore wings. When sensing a crosswind, it is optimal to control the two hind wings of the bionic dragonfly-like micro aerial vehicles.


    Access

    Download


    Export, share and cite



    Title :

    Numerical Investigation on Flapping Aerodynamic Performance of Dragonfly Wings in Crosswind


    Contributors:
    Chao Wang (author) / Rui Zhang (author) / Chaoying Zhou (author) / Zhenzhong Sun (author)


    Publication date :

    2020




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    Unknown




    Flapping wing structure imitating dragonfly wings

    YE ZIQING / YUAN CHANGSHENG / ZENG SHANSHAN | European Patent Office | 2021

    Free access

    Experimental and Numerical Investigation of Entomopter Flapping Wings Aerodynamic Performance

    Zyluk, Andrzej / Sibilski, Krzysztof / Czekalowski, Pawel | AIAA | 2016



    Experimental and Numerical Investigation of Entomopter Flapping Wings Aerodynamic Performance (AIAA 2016-3543)

    Zyluk, Andrzej / Sibilski, Krzysztof / Czekalowski, Pawel | British Library Conference Proceedings | 2016


    Aerodynamic Model for Tandem Flapping Wings

    Faisal, A. H. M | Online Contents | 2016