Abstract: In order to achieve the launch of individual rocket in limited space, a individual rocket launching system of which the liquid column is placed in the tail tube as a balance body is proposed. The system is tested, and the interior ballistics process is analyzed over time intervals. Based on the theory of the classical inrerior ballistics theory, a mathematical model of the launching system is established by assumoffing that the irregular mixing of gas and liquid is regarded as mixing of perforation. Runge Kutta method is used for numerical calculation, and the complete curves of interior ballistics process are given. The analysis result shows that the theoretical results are in good agreement with the experimental results. The relative error of the maximum pressure in combustion chamber is 1.6%, and the relative error of projectile velocity is 0.9%. The calculated results shows that the liquid column can be used to reduce the launching characteristics of rocket, improve the velocity of projectile, and enhance the power of individual rocket for the individual rocket launching systems with and without liquid column under the same launching conditions.Key

Key words: ordnancescienceandtechnology, individualrocket, theliquidcolumn, interiorballistic, mixingofperforation