Despite the extensive experimental and computational data base in the literature on passive porosity, no clear explanation of the governing flow physics exists. It is theorized that the positive porosity concept modifies the external pressure loading by allowing communication between high- and low-pressure regions on the external surface. This study determines the dominant flow phenomena that govern the effectiveness of passive porosity. It aims to assess the contribution of each phenomenon as related to a porous slender axisymmetric forebody. To assess the influence of the mass transfer and pressure equalization phenomena on the effectiveness of passive porosity on slender axisymmetric forebodies, strakes were attached to the 5.0-caliber solid and porous forebodies to force crossflow separation. Longitudinal force and moment data were obtained at a Mach number of 0.1 over an angle-of-attack range of 0 to 55 deg.


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    Title :

    Passive porosity with free and fixed separation on a tangent-ogive forebody


    Contributors:

    Published in:

    Publication date :

    1994-09-01



    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English


    Keywords :


    Passive porosity with free and fixed separation on a tangent-ogive forebody

    Wood, Richard M. / Banks, Daniel W. / Baner, Steven X. S. | AIAA | 1994




    Alleviation of side force on tangent-ogive forebodies using passive porosity

    Bauer, Steven X. S. / Hemsch, Michael J. | AIAA | 1994