椭圆截面柱形炸药爆炸冲击波威力特性

To explore the explosive shock wave characteristics of typical cylindrical explosives with elliptical cross-section,an experiment on the static explosion of variable-section cylindrical explosives in free field is conducted,and a corresponding numerical simulation model is established. The reliability of the numerically simulated results is verified by comparing with the experimental results. The explosions of cylindrical explosives with different cross-sectional shapes in free field are numerically simulated to investigate the influence of cross-sectional shape on the power characteristics of explosive shock waves. The research results indicate that the explosive shock wave generated by the cylindrical explosives with elliptical cross-section produces a wave system structure similar to that generated by the cylindrical explosives with a circular cross section,but there are differences in the propagation characteristics of shock wave at different azimuth angles. The peak overpressure,maximum impulse,and shock wave velocity in the short-axis direction are all greater than those in the long-axis direction. For elliptical cross-section explosives with different aspect ratios of long axis to short axis,the greater the aspect ratio is,the more significant this difference becomes. An equivalent radius is introduced to fit and obtain a formula for calculating the peak overpressure and the shape factor of peak overpressure,which includes the aspect ratio as a variable,and a deviation between the calculated results and the numerically simulated results is less than 10%.