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 ph...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.展开更多
The exploding foil,which is a main influence factor of exploding foil initiator(EFI),was studied to improve the utilization rate of energy in EFI.The burst currents of three bridge foils with different shapes were mea...The exploding foil,which is a main influence factor of exploding foil initiator(EFI),was studied to improve the utilization rate of energy in EFI.The burst currents of three bridge foils with different shapes were measured,and the sensitivity of initiation charge made of HNS-IV was tested by slappers.The test results show that,for O-shaped bridge foil,the burst current density is maximal,and the initiating voltage at 50% of firing probability of HNS-IV is minimal.The O-shaped bridge foil can be used to improve the utilization rate of energy in EFI and reduce the firing energy.展开更多
为了降低冲击片雷管起爆能量,优化高压脉冲功率源等效参数,研究了高压脉冲功率源等效参数如等效电感、等效电阻、电容量、电压等参数对金属桥箔电爆特性规律的影响,测试了金属桥箔在不同的等效参数条件下,其电爆性能的变化规律参数,计...为了降低冲击片雷管起爆能量,优化高压脉冲功率源等效参数,研究了高压脉冲功率源等效参数如等效电感、等效电阻、电容量、电压等参数对金属桥箔电爆特性规律的影响,测试了金属桥箔在不同的等效参数条件下,其电爆性能的变化规律参数,计算了金属桥箔的能量利用率,实验结果表明:当高压脉冲功率源储能电容容量为0.2μF,放电回路等效电感为57 n H,等效电阻为68 mΩ时,在加载电压为2.0 k V放电条件下,桥区厚度为5.0μm,尺寸为0.5 mm×0.5 mm的铜箔其爆发性能最优,有效能量利用率达到最高,为54.8%,此时桥箔的爆发时间与峰值时间最为接近,时差最小。展开更多
基金funded by National Natural Science Foundation of China grant No.11572046
文摘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.
文摘The exploding foil,which is a main influence factor of exploding foil initiator(EFI),was studied to improve the utilization rate of energy in EFI.The burst currents of three bridge foils with different shapes were measured,and the sensitivity of initiation charge made of HNS-IV was tested by slappers.The test results show that,for O-shaped bridge foil,the burst current density is maximal,and the initiating voltage at 50% of firing probability of HNS-IV is minimal.The O-shaped bridge foil can be used to improve the utilization rate of energy in EFI and reduce the firing energy.
文摘为了降低冲击片雷管起爆能量,优化高压脉冲功率源等效参数,研究了高压脉冲功率源等效参数如等效电感、等效电阻、电容量、电压等参数对金属桥箔电爆特性规律的影响,测试了金属桥箔在不同的等效参数条件下,其电爆性能的变化规律参数,计算了金属桥箔的能量利用率,实验结果表明:当高压脉冲功率源储能电容容量为0.2μF,放电回路等效电感为57 n H,等效电阻为68 mΩ时,在加载电压为2.0 k V放电条件下,桥区厚度为5.0μm,尺寸为0.5 mm×0.5 mm的铜箔其爆发性能最优,有效能量利用率达到最高,为54.8%,此时桥箔的爆发时间与峰值时间最为接近,时差最小。
