Drag Reduction from Square-Base Afterbodies at High Speeds

Mathur, NB and Viswanath, PR (2004) Drag Reduction from Square-Base Afterbodies at High Speeds. Journal of Aircraft, 41 (4). pp. 811-820.

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    Experiments have been carried out in the 0.5-m base flow wind tunnel at high speeds evaluating the drag reduction potential of a family of square base afterbodies including jet flow at the base. Direct afterbody total drag measurements have been made on square bases as well as conventional axisymmetric afterbodies with conical and13; circular arc boat tails having the same annular base area and jet flow parameters. The results show conclusively that, in the Mach-number range of 0.95 to 1.60, the square-base afterbodies have globally minimum drag in the range of jet pressure ratio studied; the total drag reduction observed is about 10-12 percent relative to the circular arc afterbodies, which can be of significant value in design applications. Certain broad flow features on square-base afterbodies are discussed based on surface-pressure measurements and surface flow-visualization studies.

    Item Type: Journal Article
    Additional Information: Copyright of this article belongs to AIAA
    Uncontrolled Keywords: Afterbodies;Aerodynamic drag; Drag reduction;Flat surfaces;Design optimization;High speed;Jet flow;Drag measurement;Pressure ratio;Base flow;Wind tunnel tests; Mach number;Flow characteristics
    Subjects: AERONAUTICS > Aerodynamics
    Division/Department: Experimental Aerodynamics Division, Experimental Aerodynamics Division
    Depositing User: Ms Indrani V
    Date Deposited: 31 Jan 2006
    Last Modified: 24 May 2010 09:39
    URI: http://nal-ir.nal.res.in/id/eprint/919

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