Study on the Attenuation Effect of Water Protection Layer on the Velocity of Jet Tip
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摘要: 采用闪光X射线摄影方法观测了射流侵彻水防护层间隔靶的过程，分析得到了射流头部的速度变化规律及水介质中金属粒子、冲击波分布特征，探讨了高温金属射流与水防护层的作用机理。结果表明：射流头部速度在侵彻水防护层间隔靶的过程中，呈现出了突然降低的假象，这是由于射流侵彻水防护层时，冲击波后的高压（9~10 GPa）与高温导致射流头部存在明显的碎化现象。在射流进入水防护层初期，射流头部的碎化最为严重，致使射流头部快速消耗，进而在脉冲X射线测量实验中出现射流头部速度突降的假象。Abstract: In the present work the process of the jet penetrating the interval target of a water protection layer was observed using flash X-ray photography, the variations of the jet tip velocity and the distribution characteristics of the metal particles and shock waves in water were obtained, and the phenomenon in the experiment were discussed in combination with the mechanism of water on the metal jet at high temperature.The result shows that the jet tip velocity would drop during the jet penetrating the water protection layer.This is mainly due to the fragmentation resulting from the high pressure (9-10 GPa) and high temperature after the shock wave of the jet.Besides, the fragmentation of the jet tip is the most serious in the early stages of the jet entering the water protecting layer, which results in a fast consumption of the jet tip and the false image of the jet tip's velocity drop in the test of the flash X-ray measurement.
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Key words:
- jet /
- water protection layer /
- tip velocity /
- fragmentation /
- flash X-ray photography
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图 5 水防护层中射流四周粒子及冲击波分布图
Figure 5. Distribution of particles and shock waves in water protection layer
表 1 装药结构参数
Table 1. Loading structure parameters
D/mm L/mm θ/(°) d/mm l/mm 50 100 57.5 20 10 
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