Effectiveness of aerospikes/aerodisk assemblies as retractable drag-reduction devices for large-angle blunt cones flying at hypersonic Mach numbers is investigated experimentally in hypersonic shock tunnel HST2 using a 120-deg apex-angle blunt cone. An internally mounted accelerometer balance system has been used for measuring the aerodynamic drag on the blunt cone with and without forward-facing aerospikes at various angles of attack. The measurements indicate around 55% reduction in drag for the blunt cone with flat-disk spike at zero degree angle of attack for a freestream Mach number of 5.75. Surface convective heat-transfer rate measurements have been carried out on the blunt cone with a flat disk tipped spike of varying length in order to locate the shock reattachment point on the blunt-cone surface. The measured heat transfer rates fluctuate by about +/-20% in the separated flow region as well as near the reattachment point indicating the unsteady flowfield around the spiked blunt cone. The shock structure around the 120-deg apex-angle blunt cone with a 12-mm-long flat-tipped aerospike has also been visualized using the electric discharge technique. The visualized shock structure and the measured drag on the blunt cone with aerospikes agree well with the axisymmetric numerical simulations.


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    Title :

    Experimental investigations of hypersonic flow over highly blunted cones with aerospikes


    Additional title:

    Experimentelle Untersuchung einer Hyperschallströmung um einen konusförmigen Rotationskörper mit einem Spike


    Contributors:
    Menezes, V. (author) / Saravanan, S. (author) / Jagadeesh, G. (author) / Reddy, K.P.J. (author)

    Published in:

    AIAA Journal ; 41 , 10 ; 1955-1966


    Publication date :

    2003


    Size :

    12 Seiten, 20 Bilder, 2 Tabellen, 28 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




    Experimental Investigations of Hypersonic Flow over Highly Blunted Cones with Aerospikes

    Viren Menezes / S. Saravanan / G. Jagadeesh et al. | AIAA | 2003




    Numerical simulation of hypersonic flow over highly blunted cones with spike

    Gerdroodbary, M. Barzegar / Hosseinalipour, S.M. | Elsevier | 2010


    CFD Analyze of Hypersonic Flow over Blunted Cones with Aerodisk

    Barzegar, Mostafa / Hosseinalipour, S. Mostafa | AIAA | 2009