Experimental research on bubble pulse of small scale charge exploded under simulated deep water
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摘要: 为在实验室内开展深水爆炸气泡脉动规律研究, 通过增加水面大气压强来模拟水中静水压的方法, 建立可模拟深水环境的爆炸容器。开展不同模拟水深条件下的3种当量炸药的水下爆炸实验, 得到了气泡脉动过程图像, 验证小当量深水爆炸模拟实验与自由场实验的等效性, 分析气泡脉动周期与最大半径同模拟水深的关系。实验结果表明:容器壁面反射效应对气泡脉动过程的影响可以忽略不计, 模拟实验可等效为自由场实验; 深水爆炸气泡脉动周期及最大半径随流体静力深度增加的衰减系数分别为-0.83和-0.364。Abstract: For investigating bubble pulse of small scale charge exploded under deepwater in the laboratory, an experiment platform of charge exploded under simulated deepwater is established by means of adding atmospheric pressure over the water surface to increase the hydrostatic pressure.Experiments of 3 small scale charges exploded under different simulated deepwater environments are conducted.Images of bubble pulse process are gained.The equivalence between experiments of small scale charge exploded under simulated deepwater and experiments under free-field is validated.The variations of the period and the maximum radius of bubble pulse depending on the water depth are analyzed.Passing through these experiments, the reflection effect from the containment vessel shell can be neglected for the bubble pulse process, and the simulated deepwater environment can be regarded as real free-field deepwater environment.When increasing the hydrostatic water depth, the attenuation coefficients of the period and the maximum radius of bubble pulse of small scale charge exploded under deepwater are-0.83 and-0.364, respectively.
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图 4 相同模拟深度下气泡脉动周期与TNT当量立方根的关系
Figure 4. Relation between bubble period and cube root of TNT equivalent charge at the same simulated depth
图 5 不同当量炸药下气泡脉动周期与水深的关系
Figure 5. Relation between bubble period and water depth under different TNT equivalent charges
图 6 气泡脉动周期与TNT当量立方根之比随水深增加关系
Figure 6. Relation between ratio of bubble period and cube root of TNT equivalent charge and water depth
图 8 气泡脉动最大半径与TNT当量立方根之比随水深增加关系
Figure 8. Ratio of maximum bubble radius and cube root of TNT equivalent charge varied with water depth
表 1 不同药量不同模拟水深气泡脉动周期及最大半径实验值
Table 1. Experimental data of bubble period and maximum radius at different charge weight and water depth conditions
w/g ps/MPa T/ms Rm/mm 0.125 0 16.5 79.7 0.125 0.2 6.5 54.2 0.125 0.3 5.0 - 0.125 0.4 3.8 42.9 0.125 0.6 3.2 38.7 0.125 1.0 2.3 36.4 0.500 0 22.5 - 0.500 0.4 6.5 71.1 0.500 0.6 4.8 63.7 1.000 0 27.0 - 1.000 0.2 11.5 103.3 1.000 0.4 8.0 87.3 1.000 0.6 6.0 79.1 1.000 0.9 4.5 69.3 
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