高压气体载荷下预制破片与空气冲击波的运动关系  

Study on Motion Law of Prefabricated Fragment and Air Shock Wave under High Pressure Gas Load

作　　者：夏晓旭 宁建国[1] 李健[1] XIA Xiaoxu;NING Jianguo;LI Jian(State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京理工大学爆炸科学与技术国家重点实验室,北京100081

出　　处：《高压物理学报》2021年第5期29-39,共11页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金(11702026)。

摘　　要：冲击波与破片的运动关系直接决定两者对目标的联合毁伤效果,采用有限体积方法和网格自适应技术,对高温高压气体载荷作用下圆形刚体破片的运动规律、冲击波的衰减规律以及两者的运动关系进行了数值模拟研究。结果表明,高温高压气团形成的冲击波与破片作用发生反射和透射,在破片前后形成的压力差是导致其加速的主要原因。在破片数量一定的情况下,破片距离高温高压气团中心越远,初速越小。当破片与高温高压气团中心的间距相同时,破片数量越多,初速越大。同时研究发现,冲击波与刚体球存在复杂的追逐关系:当初速较大时,破片和冲击波相遇两次;初速减小时,二者相遇一次;初速进一步减小时,二者不能相遇。冲击波与刚体球破片的前后关系将会影响它们对目标的毁伤是否存在耦合关系。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.

关 键 词：预制破片 空气冲击波 绕射 相遇 运动关系 

分 类 号：O389[理学—流体力学] TJ410.1[理学—力学]