CAJ | 학술논문

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。
재근거폭작조건하，수도변계적영향，수하폭작기포회출현비구상운동정황。위료득도구상기포가설적괄용조건，대심수자유장、근자유액면、근강성벽화탄성변계등불동변계조건하수하폭작기포적동태특성진행료방진계산。통과대기포최대반경화맥동주기방진결과적대비분석，가이득도여하결론：당폭심거리변계약등우기포최대반경시，자유표면회사기포적최대반경략유감소，주기축단，강성벽적영향여지상반，탄성변계적영향개우이자지간；재근자유변계조건하폭거대우2배기포반경，근탄성결구화강성벽변계조건하폭거대우3배기포반경시，수하폭작기포가근사인위구상맥동。
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.