Studies of the phenomena occurring in an electromagnetic shock tube
An electromagnetic shock tube was constructed and the observed phenomena explained assuming that the energy transferred to the driver section is stored in the form of magnetic energy. The velocity of the shock front and its rate of decay were measured and compared with theoretical predictions based upon the infinite conductivity magnetohydrodynamic flow equations. A Kerr cell shutter camera was used to photograph the shock fronts which were found to be jumbled, suggesting magnetic turbulence. A magnetic field was applied along the axis of the shock tube and its effect on the shock velocity and on the character of the shock front were explained by the interaction of the driver currents with the applied axial magnetic field. A ''precursor'' wave was observed and the gas velocity behind it measured using the boundary layer on a probe placed along the axis of the shock tube. This value of the gas velocity and measured values of the wave velocity, gas density and electric field strength are shown to be compatible with a wave-type mechanism. (Author).
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200 microns Alfven waves assumed axial field strengths axial magnetic field axis azimuthal field blocking oscillator boundary layer capacitor bank conditions in region conductivity magnetohydrodynamic flow current configuration current sheet delay line density determined Diffusion pump dissociation driver currents driver gas driver section electric field electromagnetic shock tube energy stored Evan Robert fast expansion fast shock filter flow quantities four waves gas in front gas in region gas velocity gauss hydrogen thyratron increases infinite conductivity magnetohydrodynamic interaction interface ionization joules Kerr cell shutter lucite magnetic energy magnetic pressure magnetic Reynolds numbers method of characteristics mirror camera nitrobenzene observed obtained Ohm's law oscilloscope palladium phenomena photograph photomultiplier precursor probe pulse quarter cycle radial ring electrode Robert Pugh rotating mirror series of runs shock equations shock front shock speed shock velocity slit slow expansion slow shock wave stray inductances sweep switch-on shock Tektronix temperature theory of characteristics wave moves