The wings of birds and insects often create an unsteady flow by their flapping and dynamic stall is used actively for landing or in low-speed flight. The flapping motion of the wings of insects consists of a combination of heaving (vertical movement in a forward direction), lead-lag (back-and-forth movement in a forward direction) and feathering (rotational movement around a feathering axis). Heaving is a fundamental motion of insect flight because it generates thrust in the air flow caused by the forward motion. The aerodynamic characteristics at low Reynolds number such as insect wings are different from aircraft, and little research has been conducted on the subject. The steady aerodynamic characteristics of the wings at low Reynolds number have therefore been examined with wind tunnel tests and free-flight tests of gliders. This time unsteady aerodynamic characteristics of the wings were studied by applying heaving and feathering motion to the test wings in the flow of wind tunnel.


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    Title :

    Technical Report of National Aerospace Laboratory: Experimental Study on Two-Diemnsional Unsteady Aerodynamic Characteristics of Wings at Low Reynolds Number


    Contributors:
    M. Okamoto (author) / H. Fujieda (author) / A. Azuma (author)

    Publication date :

    2002


    Size :

    42 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English