摘要
消融放电毛细管等离子体发生器产生的等离子体射流具有密度高和温度相对低的特性,在许多领域都具有潜在的应用前景。利用1维流体模型对两间隙毛细管等离子体射流发生器的主放电特性进行了模拟计算分析。模型考虑了焦耳热效应和管壁烧蚀对放电特性的影响。在管壁消融这种反馈稳定机制作用下,毛细管放电处于准稳态,其产生的等离子体温度在放电期间保持恒定。在放电能量为1 kJ的条件下,聚乙烯毛细管等离子体温度可达3 eV,电子密度可达1025m-3量级,射流速度接近10 km/s。改变放电输入的焦耳热功率密度,等离子体温度和速度变化较小,但气压、质量密度以及等离子体电子密度等特性参数均可以获得较大幅度的改变。
Ablative capillary discharge plasma jets are characterized by high density and relatively low temperature. The devices of this kind of plasma jets are of importance to a variety of applications. Two-gap capillary plasma generator（TGCPG） is a realistic alternative to the conventional capillary in electrothermal launchers and a versatile capillary plasma generator for other applications. A one-dimensional hydrodynamic model considers which the ohmic heating and wall ablation is proposed for calculating the properties of plasma arcs of the main discharges in TGCPG. The calculation shows that the discharge is in a quasi-steady state, the plasma temperature keeps stable during the discharge while the mass density and pressure are drastically changed. With 1 kJ discharge energy, a plasma jet with temperature of 3 eV, electron density of 10^25m^-3, flow velocity of 10 km/s is generated by the TGCPG. The properties of the plasma jet can be optimized by changing the input ohmic power.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2008年第6期989-993,共5页
High Power Laser and Particle Beams
基金
国家自然科学基金资助课题(59977007)
