以轴对称非定常欧拉方程为基础,建立了激光推进火箭发动机吸收室内纯气相单组分、以激光等离子体为内热源的流场模型。用MacCormark预测 校正格式编写了模拟计算程序;并对连续波和连续脉冲两种激光输入方式的激光推进火箭发动机的内部流场分别进行了模拟计算,得出了发动机相应的内部流场的温度、压强、流线及马赫数的分布情况。对计算结果进行了分析,并讨论了单点聚焦加热方式对发动机性能的影响。为进一步的激光推进数值模拟研究奠定了基础。 Based on the axisymmetric unsteady Euler equation, a flow field model was established in which laser propulsion rocket engine absorbed single component of pure gas phase and laser plasma was taken as internal heat source. The Maccormark predictive correction format was used to write the simulation program. The internal flow field of laser propulsion rocket engine with continuous laser and continuous pulse laser were simulated and the corresponding internal flow field temperature, Pressure, flow lines and Mach number distribution. The calculation results were analyzed, and the influence of single point focusing heating on engine performance was discussed. Which lays the foundation for further numerical simulation of laser propulsion.