Configuration and gas dynamics analysis for a new variable cross-section concentric canister launcher

In order to improve the hot environment that faces missiles launched by concentric canister launcher (CCL), the factors that affect the gas temperature at the outlet of CCL are discussed and the fundamental gasdynamics principle in the process of reducing gas temperature are also analyzed in this paper. And several research works for reducing outlet gas temperature of CCL are analyzed with the energy conservation theory in the paper, several kinds of CCL developed by others are explained in detail about how to reduce gas temperature at the outlet of CCL. Furthermore, a new type, variable cross-section concentric canister launcher, is proposed in the paper. The gap between outer and inter canisters of the launcher is designed to be a convergent-divergent shape similar to the Laval nozzle to enhance the outlet velocity of gas while reduce its temperature. FLUENT software is used to numerically simulate a 2-D convergant-divergent type CCL. The simulation results show that the convergant-divergent type CCL can improve the missiles faced hot environment.