近小尺度壁面水下爆炸射流特性数值模拟

Numerical Study on Characteristics of Underwater Explosion Jet Near Small Scale Wall

为了考察结构尺度对气泡射流动态特性的影响,利用AUTODYN软件,针对三种不同尺度的球形固壁面进行近壁面水下爆炸数值模拟计算。计算结果表明:壁面尺度越小,射流穿透气泡越早,气泡体积越小、越细长,射流速度越大,但射流宽度越小,射流冲击压力对壁面的作用越弱,压力产生的比冲量越小。研究结果初步揭示了结构尺度的减小不利于水射流威力的发挥,为打击小型目标的水中兵器战斗部威力设计提供有益参考。

For investigating influence of structure scale on dynamic characteristics of water jet, numerical simulation of underwater explo- sion near three sizes of spherical wall was carried out. The result shows that the smaller scale of the wall is, the sooner jet penetrates bub- ble, the smaller and slenderer bubble is, the higher speed of jet is, the smaller width of jet is, the weaker jet impacts the wall, the smaller impulse is. The result preliminarily reveals that the small scale structure can reduce water jet power, which provides a useful reference for warhead design for underwater weapons fighting against small targets.