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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 of the cavity formed by the laser focused ignition area will constrain the stable operation of the suction high frequency pulse laser propulsion engine. Based on the spherical ignition model, the effect of the initial plasma temperature on the size of the spherical cavity and the evolution of the spherical cavity are studied by numerical methods. The results show that when the energy of the plasma is large, the initial temperature of the plasma has little effect on the size of the cavity. The density of the cavity is less than 0.1 times the density of the ambient gas, the temperature is up to several thousand K and the pressure is close to the pressure of the ambient gas. The ratio of the cavity radius to the plasma kinetic radius stabilized at about 0.29. By analyzing the evolution of the spherical cavity, it provides a reference for the control of the laser parameters and the design of the focusing system.