Diffraction Attenuation Distribution of Underwater Explosion Shock Waves on the Surface of a Cylindrical Structure
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摘要: 水下爆炸冲击波作用于圆柱壳表面时, 除反射冲击波外, 在背爆面还会形成绕射冲击波。为了研究冲击波压力在圆柱壳表面的绕射分布特性, 采用ABAQUS软件的耦合欧拉-拉格朗日方法对水下爆炸冲击波与圆柱壳结构的相互作用进行了数值仿真, 得到了圆柱壳周围的压力场分布情况, 分析了不同爆距和药量对绕射冲击波衰减的影响。研究结果表明: 冲击波压力峰值和冲量在迎爆面区域急速衰减, 随着爆距的减小, 衰减到50%的角度变小, 衰减速度明显变快, 而药量对冲击波压力峰值和冲量衰减影响都很小。Abstract: When an underwater explosion shock wave acts on the surface of a cylindrical shell, a shock wave forms on the backshock surface in addition to the reflected shock wave. To study the diffraction distribution features of shock wave pressure on the surface of a cylindrical shell, the coupled Eulerian-Lagrangian method in the ABAQUS soft ware is used to simulate the interactions of underwater explosion shock waves and cylindrical shell structures. The pressure field distribution around a cylindrical shell is obtained. The influence of different blast distances and charges of TNT on the diffraction effect of shock wave attenuation is analyzed. The results indicate that the peak pressure and impulse of shock waves decay rapidly in front of the blast surface. With a decrease in blast distance, the angle required for attenuation to 50% decreases and the attenuation speed increases significantly. However, the charge of TNT has little effect on the peak pressure and impulse attenuation of shock waves.
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Key words:
- underwater explosion /
- cylindrical shell /
- shock wave /
- diffraction
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表 1 试验与仿真冲击波峰值压力对比
Table 1. Comparison of peak pressures of shock wave between test and simulation
工况 试验结果/Mpa 仿真结果/Mpa 相对误差/% 1 118.50 120.24 1.47 2 110.30 120.24 9.01 -
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