To study the aerodynamic characteristics and demarcate the influence factors on the ballistic fall points distribution of terminal sensitive proj ectile(TSP)without parachute or wing, the system dynamics and computational fluid dynamics were applied to simulate the TSP under low Mach number and high viscosity hypothesis.The flow field of TSP without parachute or wing was simulated separately.The ballistic program was edited,and the factors influencing fall-points distribution of four proj ectils in cluster barrel in the dispersion process were analyzed and demarcated.The factors influencing the ballistic fall points distribution of the parachute-bomb were studied,and the results were contrasted.The important factors influencing the space between of the points of fall are the height of throwing,embroil velocity,the angle between axes and level and throwing velocity.The important factors influencing the uniformity of the points of fall are throwing height and embroil velocity.The important factor influencing the center of the points of fall is the angle between axes and level.

For improving the attacking effect on spot and line goal,the figure of submunition was optimized by the theory of gas dynamics.Focused on different nose figures used in the shaped charge warhead and the target discrimination unit on side wall,the model was computed by CFD and tested by wind tunnel facilities.Except the drag coefficient,the aerodynamic response to different nose figure model was simulated.The simulation results show that the target discrimination unit has little contribution in the aerodynamic force.The pressure centre is near to the front of the submunition,so it may be unstable in the trajectory.Based on the result,the shaped charge submunition which has a target discrimination unit on side wall can satisfy the aerodynamic consistency without canceling target discrimination unit and adding wind cap,but an empennage should be added to keep the stability in the trajectory.

The process of penetrating multilayer medium below airstrip was numerically simulated by finite element code LS-DYNA3D. Based on different penetration velocity, penetration depth, penetration time, bomb-pose and response of bomb-stress were analyzed. The rules of the penetration process and the dynamic respond of the bomb were obtained. While the bomb passing the line of the different medium, the turn velocity of the bomb-pose was accelerated. When the penetration depth passes the line of different medium, the change measures of the dynamic respond give a spring. The numerical results are in a good agreement with the experimental data.

The propellant-accelerating instrument is used in lots of shaped charge-explosive complex warhead (SECW). but the testing accelerated effect is a difficulty. In this article the difference between the two instances in freed working state and in fixed state is contrasted. A formula is given for transforming the data tested by fixed launcher to the data in working state. And the validity of the formula is proved by experiments. The transformed way gives a good example for testing the practical data in economical way, and the formula is reasonable and helpful for engineering design.