边界条件对水下爆炸气泡运动特性的影响分析  

Analysis on the characteristics of UNDEX bubbles under different boundary conditions

作　　者：牟金磊[1] 朱石坚[2] 刁爱民[2] 李海涛[2] 

机构地区：[1]海军工程大学舰船工程系,武汉430033 [2]海军工程大学科研部,武汉430033

出　　处：《振动与冲击》2014年第13期92-97,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金青年基金(51109216;51309231);海军工程大学自然科学基金青年基金(HGDQNEQJJ12011)

摘　　要：在近距爆炸条件下,受到边界的影响,水下爆炸气泡会出现非球状运动情况。为了得到球状气泡假设的适用条件,对深水自由场、近自由液面、近刚性壁和弹性边界等不同边界条件下水下爆炸气泡的动态特性进行了仿真计算。通过对气泡最大半径和脉动周期仿真结果的对比分析,可以得到如下结论:当爆心距离边界约等于气泡最大半径时,自由表面会使气泡的最大半径略有减小,周期缩短,刚性壁的影响与之相反,弹性边界的影响介于二者之间;在近自由边界条件下爆距大于2倍气泡半径,近弹性结构和刚性壁边界条件下爆距大于3倍气泡半径时,水下爆炸气泡可近似认为球状脉动。The underwater explosion bubbles are mostly non-spherical because of the existence of different boundaries.In order to find the suitable conditions of applying the spherical bubble hypothesis,the numerical simulation of bubble movement was carried out under different boundary conditions,such as free field in deep water,near free surface,near rigid surface and near elastic boundary.By analyzing the maximum radius and the first pulse period,it can be put forward that the maximum radius and the bubble first pulse period may decrease near the free surface when the standoff distance is approximate to the maximum radius.The influence of the rigid surface is on the contrary.The influence of elastic boundaries is intervenient.While the standoff distance exceeds the triple of the maximum radius,the spherical bubble hypothesis is suitable for analyzing the movement of UNDEX bubbles during the first pulse period under elastic and rigid boundary conditions,and when under the near free surface condition,the distance should exceed the double of the maximum radius.

关 键 词：水下爆炸 球形气泡假设 气泡脉动 边界条件 数值仿真 

分 类 号：O346[理学—固体力学] U661.43[理学—力学]