Characteristics of a plasma flow field produced by a metal array bridge foil explosion  

作　　者：Junying WU Long WANG Yase LI Lijun YANG Manzoor SULTAN Lang CHEN 伍俊英;汪龙;李雅瑟;杨利军;Manzoor SULTAN;陈朗(State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology)

机构地区：State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing 100081,People＇s Republic of China

出　　处：《Plasma Science and Technology》2018年第7期127-138,共12页等离子体科学和技术（英文版）

基　　金：funded by National Natural Science Foundation of China grant No.11572046

摘　　要：To improve the energy utilization efficiency of metal bridge foil explosion, and increase the function range of plasmas, array bridge foil explosion experiments with different structures were performed. A Schlieren photographic measurement system with a double-pulse laser source was used to observe the flow field of a bridge foil explosion. The evolution laws of plasmas and shock waves generated by array bridge foil explosions of different structures were analyzed and compared. A multi-phase flow calculation model was established to simulate the electrical exploding process of a metal bridge foil. The plasma equation of state was determined by considering the effect of the changing number of particles and Coulomb interaction on the pressure and internal energy. The ionization degree of the plasma was calculated via the Saha-Eggert equation assuming conditions of local thermal equilibrium. The exploding process of array bridge foils was simulated, and the superposition processes of plasma beams were analyzed. The variation and distribution laws of the density, temperature, pressure, and other important parameters were obtained. The results show that the array bridge foil has a larger plasma jet diameter than the single bridge foil for an equal total area of the bridge foil. We also found that the temperature, pressure, and density of the plasma jet＇s center region sharply increase because of the superposition of plasma beams.To improve the energy utilization efficiency of metal bridge foil explosion, and increase the function range of plasmas, array bridge foil explosion experiments with different structures were performed. A Schlieren photographic measurement system with a double-pulse laser source was used to observe the flow field of a bridge foil explosion. The evolution laws of plasmas and shock waves generated by array bridge foil explosions of different structures were analyzed and compared. A multi-phase flow calculation model was established to simulate the electrical exploding process of a metal bridge foil. The plasma equation of state was determined by considering the effect of the changing number of particles and Coulomb interaction on the pressure and internal energy. The ionization degree of the plasma was calculated via the Saha-Eggert equation assuming conditions of local thermal equilibrium. The exploding process of array bridge foils was simulated, and the superposition processes of plasma beams were analyzed. The variation and distribution laws of the density, temperature, pressure, and other important parameters were obtained. The results show that the array bridge foil has a larger plasma jet diameter than the single bridge foil for an equal total area of the bridge foil. We also found that the temperature, pressure, and density of the plasma jet＇s center region sharply increase because of the superposition of plasma beams.

关 键 词：array bridge foil electrical exploding PLASMA shock wave numerical simulation 

分 类 号：O53[理学—等离子体物理] TQ560.72[理学—物理]