Abstract
Abstract : The M788, M789, and M799 30 mm ammunition use a flash tube to augment the ignition stimulus of the primer and to provide an ignition source for the propellant bed in each round. The flash tube must be fast acting, provide abundant hot gases/particles, and increase the pressure in the propellant bed sufficiently that the initial burn rate of the propellant in the bed is high enough to propel the projectile to the muzzle within the few milliseconds that constitute the action time of the M230 cannon. This investigation studied the dynamic rupture pressure of the lacquer seal on the flash tube. The rupture pressure of the seal was found to be a function of the pressurization rate in the flash tube. At the largest rupture pressure of this study (78 MPa 11,200 PSI), significant gas generation would be achieved before the flash tube vented into the main propellant bed. Gas flow at these pressures is expected to play a significant role in ignition of the main propellant charge and rapid functioning of the round.
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