Magnetohydrodynamic experiments suggest that power can be generated at a gun muzzle from residual propellant energy at projectile launch. A series of tests, thermomechanical calculations, and construction of a 1-D model show that: electrical conductivity of gun propellant gases can be significantly enhanced, the blast wave is decelerated about 50 % by a pulsed magnetic flux density of 4 tesla, and blast overpressures are thereby reduced about 25 % at the forward gauge external to the muzzle test device. The investigative objective is conceptual feasibility. Given the hypothesis that there are two magnetic flux compression regions, one in the shocked expansion gas, the other in the shocked precursor gas; and that pressure at the contact discontinuity is the total of static and magnetic pressures, then the calculated shock wave deceleration roughly approximates the measured shock attenuation. The Modell developed introduces a new interpretation of the electrical efficiency E/uB, in terms of the driving propellant gas quantities at the muzzle. Energy extraction was not attempted with this low magnetic Reynolds number test device, but scaling supports the design of a 100 MW post muzzle generator for conventional large caliber cannon applications, such as blast and recoil suppression, and for electromagnetic launch augmentation.


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    Title :

    Magnetohydrodynamic control of gun blast overpressure - experimental and analytical investigations


    Additional title:

    Magnetohydrodynamische Kontrolle vom Rohrwaffenstosswellen-Ueberdruck - Experimentelle und analytische Untersuchungen


    Contributors:

    Published in:

    AIAA-Papers ; Jun ; 1-20


    Publication date :

    1987


    Size :

    20 Seiten, 18 Bilder, 4 Tabellen, 58 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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