One of the key problems of numerical simulation of serial launch process of stacked projectile weapon is accurately simulating the coupling effect between the propellant gas and later projectiles. However, the interior ballistic numerical simulation can only obtain the motion law of the later projectiles accurately, before the projectile head reaches the muzzle. And the velocity increments, caused by muzzle flow field, also can be not obtained. In order to study the motion law after the projectile head flies out of muzzle, the launch process of two serial launched projectiles, considering muzzle flow field, is numerical simulated by FLUENT, coupled with interior ballistic simulated code. The numerical simulation results show that the formation process of the bottle shock of the second projectile is different, comparing with the first projectile. The variation law of projectile head resistance of the second projectile is consistent with the one calculated by one-dimensional two-phase reaction flow interior ballistic model, before the projectile head reaches the muzzle. After the projectile head flies out of the muzzle, the projectile head resistance decreases rapidly, but then it is not always equal to zero. After the projectiles leave the muzzle, the velocity increments are mainly determined by muzzle pressure.
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