Abstract: A cross flow is applied on a missile, which has a great influence on the stage of out of tube, when a missile is launched from the concentric canister launcher during the movement of submarine. This leads to a series of launching safety and load problems. In order to obtain a higher degree of confidence of load characteristics out of tube both in time and spatial dimensions and use the less hypotheses, an unsteady simulation model which can solve the flow field and missile motion in consideration of the adapter elasticity and 3 DOF motion of missile is proposed and established by the first time. The effect of bubble elasticity on the load characteristics is analyzed. The motion parameters, load characteristics and adapter deformation during the launching of missile from launch tube are obtained. The results show that the oscillation resulting from the cross flow has an adverse effect on missile launching.

Key words: ordnance science and technology, underwater launching, load characteristics, coupling calculation of flow field and motion, adapter elasticity