基于准静态波的吸气式高重频脉冲激光推进性能数值研究
Numerical study on performance of air-breathing high frequency pulsed laser propulsion
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摘要: 根据高重频脉冲激光产生光学脉冲放电形成准静态波的原理，对自编的流体力学计算程序进行了验证，结果表明该程序可用于吸气式高重频脉冲激光推进性能的数值研究。分别计算了基于移动点火点和喷射气流两种模式下准静态波流场的冲量耦合系数，均高达600 N/MW，比传统的低频脉冲激光推进冲量耦合系数250 N/MW高。比较了两种模式的优缺点，给出了不同模式的适用情况，结果表明，对于机理研究来说，喷气模式更易于实现。Abstract: Based on the mechanism of quasi-stationary wave (QSW) formed by optical pulsed discharge (OPD), which is generated by high frequency pulsed laser, a self-compiled computational fluid dynamics program is validated. The results indicate that this program can be used to study air-breathing high frequency pulsed laser propulsion numerically. Impulse coupling coefficients of QSW fluid field based on moving igniting point mode and jet flow mode are both up to about 600 N/MW, which are higher than that of traditional low frequency pulsed laser propulsion (250 N/MW). Advantages and disadvantages of the two modes are compared, and their applicable situation is listed. Moreover, the jet flow mode is easier to realize for mechanism study.
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