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管中激光加速器是一种新型的激光推力器,弹射体在管道中被加速。利用光线追踪法,根据光线在网格中的传播路径信息,运用辐射输运方程,得到流场的能量源项;数值求解含能量源项的流体控制方程,对管道中等离子体流场激波的形成和演化过程进行了研究。模型能够模拟空气光学击穿、空气对激光能量的吸收、等离子体对激光的屏蔽作用和推力形成过程,通过计算得到冲量耦合系数为3.61×10-4N/MW,等离子体内能转化为流场动能的比例约为9%。
Tube laser accelerator is a new type of laser thruster, the projectile is accelerated in the pipeline. The ray tracing method is used to obtain the energy source term of the flow field according to the propagation information of the ray in the grid and the radiation transport equation. The numerical solution of the fluid control equation with energy source term is used to analyze the plasma flow field shock The formation and evolution of the process were studied. The model can simulate air optical breakdown, absorption of air to laser energy, shielding effect of laser on laser and formation of thrust. The impulse coupling coefficient is calculated to be 3.61 × 10-4N / MW and the plasma energy can be transformed into kinetic energy The ratio is about 9%.