Abstract: In order to investigate the effect of initial release conditions on the safety of aerial bomb separated from aircraft, the separation process of aerial bomb from aircraft is simulated by using unsteady CFD numerical simulation method, dynamic mesh technique and 6-DOF trajectory equations. The trajectory and attitude variation of bomb after release are given under different conditions of Mach number, angle of attack, angle of sideslip, flight altitude, initial separation velocity and initial angular velocity. The results show that the aircraft has a strong aerodynamic interference on the bomb when separating, and has a great influence on the bomb's aerodynamic characteristics, trajectory and attitude. As the Mach number and angle of attack increase, the interference of aircraft on the bomb enhances, and the safety gets worse. For the bomb mounted under the left wing, a certain negative angle of sideslip is favorable to safe separation. The higher the flight altitude is, the safer the separation is. The certain initial separation speed and proper angular velocity are benefit for separation safety.

Key words: ordnance science and technology, weapon separation, numerical simulation, dynamic mesh, aerodynamic characteristics