Two-dimensional axisymmetric interior ballistics simulations in theprojectile launch system utilizing long slotted tubular solid propellantare carried out using solid/gas two-phase fluid dynamics code ofEulerian-Lagrangian approaches. The movement of slotted tubularsolid propellant is simulated one-dimensionally by Lagrangianapproach. The simulation results are compared with experimental datafor validation. The histories of the breech pressure and projectilevelocity under various conditions are in good agreement with theexperimental data. We examine the effects of the projectile andpropellant mass conditions on the energy release rate of solidpropellant and the projectile kinetic energy at the muzzle. A series ofthe simulations by changing the mass of projectile and propellantclarifies that the launch system requires the heavier projectile forensuring the sufficient time of the projectile staying in the launch tubeto convert efficiently the propellant chemical energy to the projectilekinetic energy.
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