Shock-induced separated flows on the lee surface of delta wings

Seshadri, SN and Narayan, KY (1987) Shock-induced separated flows on the lee surface of delta wings. Aeronautical Journal, 91 . pp. 128-141.

Full text available as:
[img] PDF
Download (6Mb)

    Abstract

    Experiments were conducted to study shock-induced separated13; flows on the lee surface of delta wings with sharp leading edge at supersonic speeds. Two sets of delta wings of13; different thickness (10xB0; and 25xB0; normal angle). each with13; leading edge sweep angles varying from 45xB0; to 70xB0;, were13; tested. The measurements. carried out in a Mach number13; range from 1.4 to 3.0. included oil flow visualisations (on both sets of wings) and static pressure distributions (on the thicker wings only). Using the test results, some features of shockinduced separated flows, including in particular the boundary between this type of flow and fully attached flow, have been determined. The experimental results indicate that this boundary does not seem to show any significant dependence on wing thickness within the limit of thicknesses tested. It is shown that this boundary.can be predicted for thin delta wings using a well known criterion for incipient separation in a glancing shock wave boundary layer interaction. namely that a pressure rise of 1.5 is required across the shock. Comparison of the predicted boundary with experimental results (from oil flow visualisations) shows good agreement.

    Item Type: Journal Article
    Uncontrolled Keywords: lee surface;Shock-induced;Delta wings;Visualisations;Glancing shock;Predicted boundary
    Subjects: ENGINEERING > Fluid Mechanics and Thermodynamics
    Division/Department: Experimental Aerodynamics Division, Aerodynamics
    Depositing User: M/S ICAST NAL
    Date Deposited: 27 Oct 2006
    Last Modified: 24 May 2010 09:51
    URI: http://nal-ir.nal.res.in/id/eprint/3057

    Actions (login required)

    View Item