The turbulent character of the boundary layer and wake associated with an airfoil has been studied at a Reynolds number of 10(exp 6) and a Mach number of 0.1. To accomplish these measurements, a unique laser Doppler anemometer (LDA) has been developed that is capable of sensing two velocity components from a remote distance of 2.13 m. Using special simultaneity logic and counter-type signal processors, the geometrical features of the LDA have been exploited to provide variable spatial resolution as low as 0.2 mm. By combining the LDA with an on-line computerized data acquisition and display system, it has been possible to measure mean velocity and Reynolds stress tensor distribution at several locations along the upper surface of a 0.9 m chord, flapped airfoil installed in the Ames 7- by 10-Foot Wind Tunnel.


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    Titel :

    High-Resolution LDA Measurements of Reynolds Stress in Boundary Layers and Wakes


    Beteiligte:

    Kongress:

    Aerodynamic Testing ; 1980 ; Colorado Springs, CO, United States


    Erschienen in:

    Erscheinungsdatum :

    1982-05-01


    Medientyp :

    Sonstige


    Format :

    Keine Angabe


    Sprache :

    Englisch