Characterization of Flame Spreading and Venting in Bayonet Primer Tubes,
APPLIED COMBUSTION TECHNOLOGY INC ORLANDO FL
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Theoretical modeling of the combustion processes in granular propellant gun systems has generally focused upon the ignition and flame spreading behavior for the main charge based upon the flow of a compressible gas through a mobile, reacting propellant bed. Diagnostic experiments using high-speed motion photography and instrumented 76 mm primer tubes have been conducted to characterize the flashtube venting history and axial pressure profile for black powder, boron potassium nitrate, and magnesium-teflon-viton primer materials. Experimental data have been used to calculate primer discharge functions for the mass flux, mx,t, and the energy flux, Ex,t for gas phase and phase primer products. Results indicate that approximately 50 percent of the primer discharge energy is in the condensed Phase. Test data, analyses, and results are presented herein.