高压气体载荷下预制破片与空气冲击波的运动关系

The motion relationship between shock wave and fragment directly determines the coupled damage effect on the target. In the present study, the finite volume method and mesh adaptive technique are used to study the motion of the circular rigid body, the attenuation of the shock wave and the motion law of both under the high temperature and high pressure gas loads. The results show that the shock wave formed by high temperature and high pressure air masses reflects and diffracts from the cylindrical fragments, and the pressure difference formed before and after the fragments is the main reason for its acceleration. In cases with a fixed number of fragments, the larger the spaces between the fragments and the center, the lower the initial velocities. When the space is fixed, the greater the number of fragments, the larger the initial velocities. In addition, it is also found that there is a complicated chase relationship between the leading shock wave and the fragment. When the initial velocity is large, the fragment and the shock wave is found to meet twice. With the initial velocity decreasing they meet one time. With the initial velocity decreasing further they cannot meet. The front-to-back relationship between the shock wave and the fragments is expected to affect whether there is a coupled damage to the target.