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详细分析了激光击穿空气和激光维持等离子体爆轰波(LSD)的传播机制,基于Navier-Stokes方程建立了考虑湍流、等离子体辐射的流场分析模型,采用有限体积法系统分析了推进器喷管内等离子体冲击波流场的演变规律,研究了单脉冲激光能量大小和脉宽对推进性能的影响。数值仿真中明显捕捉到有关实验中观察到的马赫杆的产生与移动过程;得出了推力和冲量耦合系数随脉冲能量、脉宽的变化关系,计算结果与德国空间中心实验吻合得较好,为脉冲激光器的选择和脉冲参数优化提供了参考依据。
The propagation mechanism of laser breakdown air and laser sustaining plasma detonation wave (LSD) is analyzed in detail. The flow field analysis model considering turbulence and plasma radiation is established based on Navier-Stokes equations. The finite volume method The evolution of the plasma shock wave field in the nozzle was studied. The influence of the pulse energy and pulse width on the propulsion performance was studied. Obviously, the generation and movement of the Mach rod observed in the experiments are clearly captured in the numerical simulation. The relationship between the coupling coefficient of the thrust and the impulse with the pulse energy and pulse width is obtained. The calculated results are in good agreement with the experiments in the German center of space. It provides a reference for selecting pulsed laser and optimizing pulse parameters.