切缝药包爆炸作用机理数值模拟

Numerical simulation on explosion mechanism of split-tube charge holders

为研究切缝药包定向控制爆炸机理,基于双缝/耦合切缝药包爆轰行为高速纹影实验,建立"炸药-切缝管-空气"模型,采用数值模拟方法研究切缝药包爆炸过程中冲击波相互作用、爆炸流场压力时空分布和切缝管形态变化。研究结果表明:切缝药包爆炸过程中切缝管能够有效控制爆炸能量释放和爆生气体动力学行为;切缝方向压力超前且高于非切缝方向;在爆炸冲击波及爆生气体共同作用下,切缝管曲率不断变小且从起爆点处以相同的变形特征沿切缝管轴向发展;数值模拟结果与实验结果吻合。

To explore the directional-control blasting mechanism of a split-tube charge holder,a model was established by coupling explosive,a split-tube,and air.On the basis of the experimental results of the double split-tube charge holder by the high-speed schlieren system,the established model was used to carry out numerical simulations to investigate the interaction of shock waves,the spatial and temporal distribution of pressure in the explosion fields,and the morphological changes of the split-tube.The investigated results show that in the explosion processes of the split-tube charge holder,the split-tube can effectively control the energy release of explosive and the dynamic behavior of detonation gas;the pressure in the cutting direction appears earlier and it is higher than those in the non-cutting directions;under the joint action of the explosion shock waves and the detonation gas,the curvature of the split-tube decreases continuously and develops along the axial direction of the split-tube with the same deformation characteristics from the initiation detonation point;the numerical simulation results are in agreement with the experimental ones.