摘要
针对双层结构在水中受到水下爆炸冲击这一问题,利用欧拉有限元数值模型对近场水下爆炸气泡与双层破口结构的相互作用机理进行了研究,分析了舱室涌流及流场演化等规律。首先,通过放电实验对数值模型进行了验证,结果表明,数值结果和实验结果吻合较好;然后,总结了不同破口尺寸、不同起爆位置和不同壳间水位条件下的耦合作用规律。在内部空气、流体惯性以及破口的联合作用下,气泡演化过程中会出现气泡分割现象。当内层破口尺寸系数小于0.5时,内舱室内会出现二次涌流现象,且涌流形态较细长;炸药起爆位置系数小于0.1时,自由液面处会出现破碎和重闭合现象;壳内水位对舱室涌流量的影响作用较为复杂,当水位满舱时,急速涌流会减少船艇的应急时间。
To address the problem of double-structures subjected to underwater explosion,the interaction mechanism between explosion bubbles and double-layer structures with circular hole was studied.And the characteristics such as cabin inrush and flow field change were analyzed by an Eulerian finite element numerical model.First of all,the numerical model was verified through discharge experiments,and it turned out that the numerical results agreed well with the experimental results.Then,the interaction behaviors under different initial conditions were summarized.Under the combined action of internal air,fluid inertia and breach induction,the bubble’s segmentation occurs during the bubble evolution process.When the size coefficient of the inner-layer breach is less than 0.5,the secondary water hump phenomenon occurs in the inner-cabin and the shape of the inrush is slender.When the explosive detonation position coefficient is less than 0.1,the re-closing and breaking of the free surface will take place.The influence of the free surface in the shell on the cabin inrush is complicated and when the water level is full,the rapid surge will reduce the emergency time of the ship.
作者
贺铭
张阿漫
刘云龙
HE Ming;ZHANG Aman;LIU Yunlong(College of Shipbuilding,Harbin Engineering University,Harbin 150001,Heilongjiang,China)
出处
《爆炸与冲击》
EI
CAS
CSCD
北大核心
2020年第11期37-47,共11页
Explosion and Shock Waves
基金
国家自然科学基金(11872158)。
关键词
双层破口
水下爆炸
欧拉有限元方法
舱室涌流
double-layer breach
underwater explosion
Eulerian finite element method
cabin inrush
