Abstract: To improve the generality of launchers, this paper proposes a new type of ejection device, wihch is a controllable thrust vertical launcher similar to the concentric canister. Through the numerical calculation of zero-dimensional interior ballistics and simulation of three-dimensional interior ballistics, the influence of the gas outlet area of the low-pressure chamber on the internal ballistic performance of the launcher is analyzed. By means of polynomial fitting, the relationship between the gas outlet area of the low-pressure chamber and the maximum ejection acceleration, the ejection velocity, and the ejection time are obtained, and the fitted formulas are verified. The findings are as follows. It is feasible to change the gas outlet area of the low-pressure chamber to control the thrust of the launcher; the maximum ejection acceleration, ejection velocity, and ejection time change approximately linearly with the gas outlet area, so as the area of the gas outlet of the low-pressure chamber decreases, the maximum ejection acceleration increases, the ejection velocity increases, and the ejection time decreases; the error of maximum ejection acceleration obtained by the relational expression is within 8%, and the errors of the ejection velocity and the ejection time are both within 4%.

Key words: verticallauncher, controllablethrust, ejection, interiorballistic, computationalfluidmechanics