Abstract: In order to get the law of impulse coupling coefficient varying with focal direction,the ray tracing method was used for solving the equation of laser radiation transporting which was simultaneous with the two-dimension axial symmetry radiation fluid mechanics equations and impulse coupling coefficient corresponding to different focal direction under the condition of 3 different groups energy was obtained for parabolic nozzle.The numerical results indicate that impulse coupling coefficient reduces in general when focal direction ranges from 0° to 135° and the trend becomes apparent when energy is rather high.

Key words: Laser propulsion;Air-breathing mode;Focus direction;Parabolic nozzle;Impulse coupling coefficient

摘要： 为了获得吸气式激光推进冲量耦合系数随聚焦方向的变化规律,针对抛物形喷管,采用光线追踪法求解辐射输运方程,通过与二维轴对称辐射流体动力学方程组联立,计算得到了3组单脉冲激光能量条件下不同聚焦方向对应的冲量耦合系数。计算结果表明:当聚焦方向在0°～135°范围内变化时,冲量耦合系数总体上呈下降趋势,而且激光能量较大时,这种趋势愈明显。

关键词: 激光推进;吸气式;聚焦方向;抛物形喷管;冲量耦合系数