| Attacking enemy in depth from sea (especially submarine) was more and more attached importance to in modern war, and the main military economy facilities of enemy was immersed in palsy. Thus, underwater launching technology has been turned into investigative hotspot. On the basis of the concentric canister missile launcher system, the paper mainly studies the submarine-based missile underwater launching technology. What the author did are as follows:1. Moorage state of missile is investigated. When the distance from booster spout to the bottom of CCL is constant, the influence of annular size to interior flow is researched, and optimal annular size is found. When annular size is constant, the influence of the distance from booster spout to the bottom of CCL to interior flow is investigated. When the annular size and distance are constant, the influence of the water location in the canister is investigated.2. The simulated the two-dimension axis symmetry non-constant flowing state of jet flow in virtue of dynamic mesh has been simulated in this paper as the flow is viscous and compressible. From the results, the developing trend along the axis and the shape of special-complex shock can be observed and the typical moment figure of pressure, vector, temperature, mach isoclines has been provided in the paper. The flowing characteristic was analyzed. The watery boiloff has been provided, and the water hadn't better enter into canister was educed.
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