摘要
激光聚焦点火区域形成的低密度球腔会制约吸气式高重频脉冲激光推进发动机的稳定工作。基于球形点火模型,用数值计算方法研究了等离子体的初始温度对球腔大小的影响以及球腔的演化特点。研究表明,当等离子体的能量较大时,它的初始温度对球腔大小的影响较小;球腔的密度不足环境气体密度的0.1倍,温度高达几千K,压强接近环境气体压强;球腔半径与等离子体动力学半径的比值稳定在0.29左右。通过对球腔演化规律的分析,为激光器参数的控制和聚焦系统的设计提供了一定的参考依据。
The low density cavity in the ignition area formed by laser focusing can restrict the steady work of highly repetitive frequency air-breathing pulsed laser propulsion.The influence of the initial temperature of the plasma on the cavity size is studied and the evolution characteristic of the cavity is calculated numerically based on the global ignition model.The results suggest that the initial temperature of the plasma has little influence on the cavity size when the energy of the plasma is larger.The densi...
出处
《推进技术》
EI
CAS
CSCD
北大核心
2009年第4期500-503,共4页
Journal of Propulsion Technology
基金
国家"九七三"项目(61328)
关键词
激光推进
等离子体
低密度球腔
数值计算
Laser propulsion
Plasma
Low density cavity
Numerical calculation
