Direct Drag Measurements On Two LCA-Related Afterbodies Using The Jet Simulation Rig

Vishwanath, PR and Patil, SR and Verma, RS (1996) Direct Drag Measurements On Two LCA-Related Afterbodies Using The Jet Simulation Rig. Technical Report. NAL, Bangalore.

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    Abstract

    Results of zero-lift drag characteristics on two LCA-related afterbodies employing the jet simulation rig are reported . One of the afterbodies was an sxisymmetri.c configuration relevant to LCA Kaveri Engine and the other involved a three-dimensional boat-tailing concept leading to a square base;the annular base area to (max) forebody cross-sectional area was 0.23 for both afterbody configurations. The tests were made at freestream Mach numbers of 0 .80 and 0 .96 and covered a jet pressure ratio of 1.5 to 5.0 The results show that, while the total drag levels for the two afterbodies are comparable at MO.= 0.80, the drag of the square base afterbody is appreciably lower (about 20%) relative to the axisymmetric case at M=0.96 . Certain broad features of the flow on square base afterbodies are discussed as well.

    Item Type: Proj.Doc/Technical Report (Technical Report)
    Uncontrolled Keywords: Afterbody Drag;Jet Simulation Rig
    Subjects: ASTRONAUTICS > Astronautics (General)
    Division/Department: Experimental Aerodynamics Division, Experimental Aerodynamics Division, National Trisonic Aerodynamic Facility
    Depositing User: M/S ICAST NAL
    Date Deposited: 23 Aug 2012 10:58
    Last Modified: 23 Aug 2012 10:58
    URI: http://nal-ir.nal.res.in/id/eprint/10799

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