水中电爆炸金属丝阵形成强汇聚冲击波的研究

水中电爆炸金属丝阵形成的强汇聚冲击波在冲击加载、惯性约束核聚变研究方面有重要应用前景，目前只处于探索研究阶段。本课题开展水中电爆炸金属丝阵（柱形、球形）形成强汇聚冲击波研究，主要研究内容为：①水中冲击波特性参数：波后水介质密度分布的诊断研究。对于压力、密度、温度、内能、焓这几个热力学参数，只需知道其中两个参数便能根据物态方程确定其余参数，但目前唯一能诊断的只有冲击波压力。本课题拟采用M-Z激光干涉法对波后介质密度分布进行诊断，以全面描述波后介质热力学性质。②汇聚冲击波波前时空演化的诊断及对称性调整技术研究。针对柱形、球形丝阵，基于激光阴影法，获取不同实验条件下汇聚.冲击波波前形态的时空演化图像，掌握各影响因素（丝间距、丝阵半径、丝半径、驱动电流波形等）对波前对称性的影响规律，实现对波前对称性的调整。项目成果有助于深入理解丝阵汇聚冲击波传输特性，还可提供建立及校验流体力学模型所需实验数据。

Converging strong shock wave generated by underwater electrical explosion of wire array has good application prospects in researches related to impact loading and inertial confinement fusion. However, it is still in a groping phase. This project intends to carry out the research on the formation of converging strong shock wave generated by underwater electrical explosion of cylindrical and spherical wire array, and the main tasks include: ① Diagnostic of density distribution of water medium behind wave front. Thermodynamic theory tells us that for thermodynamic parameters such as pressure, density, temperature, internal energy and enthalpy, we just need to get two of them and then can determine the remaining parameters according to the material equation of state (EOS). However, only the shock wave pressure can be diagnosed at present. In this project, an M-Z laser interferometer will be used to diagnose the density distribution of water medium. Based on the diagnostic results of the interferometer and a pressure probe, we can achieve a comprehensive description of the thermodynamic properties of water media behind wave front. ② Diagnostic of wave front shape of converging shock wave and study on the adjustment technique for symmetry degree of wave front shape. For cylindrical and spherical wire array, by means of laser shadowgraphy, the time and space resolved images of wave front will be obtained under different conditions, and the effects of various factors (such as wire spacing, wire array radius, wire radius, and driving current waveform) on the symmetry degree of wave front will also be studied. The results of this project would provide us a better understanding of propagation characteristics of converging shock wave and basic experimental data to develop and validate the hydrodynamic (HD) model.