A series of numerical experiments were performed in which energy was deposited ahead of a cone traveling at supersonic/hypersonic speeds. The angle of attack was zero, and the cone half-angles ranged from 15 to 45 deg. The Mach numbers simulated were 2, 4, 6, and 8. The energy was deposited instantaneously along a finite length of the cone axis, ahead of the cone's bow shock, causing a cylindrical shock wave to push air outward from the line of deposition. The shock wave would sweep the air out from in front of the cone, leaving behind a low-density column/tube of air, through which the cone (vehicle) propagated with significantly reduced drag. The greatest drag reduction observed was 96%. (One-hundred percent drag reduction would result in the complete elimination of drag forces on the cone.) The propulsive gain was consistently positive, meaning that the energy saved as a result of drag reduction was consistently greater than the amount of energy 'invested' (i.e., deposited ahead of the vehicle). The highest ratio of energy saved/energy invested was approximately 6500% (a 65-fold 'return' on the invested energy). The authors explored this phenomenon with a high-order-accurate multidomain weighted essentially nonoscillatory finite difference algorithm, using interpolation at subdomain boundaries. This drag-reduction/shock-mitigation technique can be applied locally or globally to reduce the overall drag on a vehicle.


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    Title :

    Computational study of shock mitigation and drag reduction by pulsed energy lines


    Additional title:

    Dämpfung der Stoßwelle und Verminderung des Widerstands eines konischen Überschallflugkörpers mit einer Impulswärmequelle


    Contributors:

    Published in:

    AIAA Journal (online) ; 44 , 8 ; 1720-1731


    Publication date :

    2006


    Size :

    12 Seiten, 7 Bilder, 6 Tabellen, 55 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




    Computational Study of Shock Mitigation and Drag Reduction by Pulsed Energy Lines

    Kevin Kremeyer / Kurt Sebastian / Chi-Wang Shu | AIAA | 2006


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    Kremeyer, K. / Sebastian, K. / Shu, C.-W. et al. | British Library Conference Proceedings | 2004


    Lines of Pulsed Energy: Shock Mitigation and Drag Reduction

    Kremeyer, Kevin / Sebastian, Kurt / Shu, Chi-Wang | AIAA | 2004