Influential factors analysis to additional ejection force in concentric canister launcher

When the missile is launched by concentric canister launcher, the bottom will be affected by additional ejection force depending on the exhaust slit width, reinforcing device configuration, diversion cone configuration and some other factors. An additional ejection force theory formula was developed using the integral form momentum equation. Qualitative analysis and explanation of various factors on additional ejection force were also conducted. Numerical simulation technology was used to verify the theoretical analysis. The study results show that there is a positive correlation between the force on tube bottom and the additional ejection force. The additional ejection force can be enhanced by decreasing the gap between two concentric canisters. The force on tube bottom will be decreased when diversion cone is installed. Smoother generatrix of diversion cone means smaller force on the tube bottom. The same amount time is needed for exhausts to reach steady state whether there is a diversion cone.