Wing in ground effect characteristics of circular-arc aerofoils for aero-train

Tomoyuki Ishizuka, Yasuaki Kohama, Takuma Katoh, Satoshi Kikuchi

    Research output: Contribution to journalArticlepeer-review

    5 Citations (Scopus)

    Abstract

    In this paper, the aerodynamic characteristics of a symmetrical ground effect wing are measured in a low turbulance wind tunnel. To change the directions of an Aero-Train in practical use, it must shuttle back and forth. Circular-arc aerofoil seems to be suitable for the Aero-train, while it can run back and forth by changing only the attack angle of wings. Lift and drag characteristics of NACA 6412-modified, circular-arc aerofoils with thickness ratio 9% and 12% were clarified by the 6-component balance. Suction and moving-belt system were used to simulate the ground. Characteristics of two-dimensional aerofoils and three-dimensional wings were compared, and lift-to-drag rations of three aerofoils were compared. Separations on the upper surface of the circular-arc aerofoils were visualized by tuft and oil spot method. It was found that increase of drag in ground effect condition was caused by increase of the induced drag and by enlargement of the separation area on upper surface of circular-arc aerofoils. A circular-arc aerofoil with thickness ratio 9% at the angle of attuck 2 degrees had enough lift-to-drag ratio for Aero-Train.

    Original languageEnglish
    Pages (from-to)1179-1185
    Number of pages7
    JournalNippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
    Volume70
    Issue number693
    DOIs
    Publication statusPublished - 2004 May

    Keywords

    • Aero-Train
    • Circular-Arc Aerofoils
    • Flow Visualization
    • Fluid Force
    • Lift-to-Drag Ratio
    • Separation
    • Wing in Ground Effect

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Mechanical Engineering

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