Propulsion by Absorption of Laser Radiation
Propulsion by Absorption of Laser Radiation
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DOI：
10.2514/3.49462
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发表时间：
1973-07
期刊：
影响因子：
2.5
通讯作者：
A. Pirri;M. Monsler;P. Nebolsine
中科院分区：
文献类型：
--
作者：
A. Pirri;M. Monsler;P. Nebolsine
介绍了通过吸收远程高功率激光器辐射进行推进的物理实验研究结果。脉冲和稳态模拟实验均利用兆瓦峰值功率脉冲 CO2 激光器进行。以石墨、有机玻璃和氟化锂为固体推进剂，在真空室内进行了稳态模拟实验。脉冲实验包括推力的弹道摆测量、壁压力迹线和等离子体速度的条纹相机记录，以推断激光驱动的脉冲喷气机的效率，其中空气用作燃料。结果表明，对于稳态推进，通过使用激光简单地汽化合适的固体推进剂可以获得高推力与激光功率之比（〜10-100达因/瓦）。然而，对于高比冲（~1000 秒），需要以稳定的方式向蒸汽添加能量。这可能需要对吸收特性进行外部控制的气态推进剂，以在无喉喷嘴中稳定加热。脉冲喷射实验的推力与激光功率之比约为 25 达因/瓦。为了提高推进剂质量利用的效率，需要具有更高功率的更短的激光脉冲。
The results of an experimental study of the physics of propulsion by absorption of radiation from a remotely stationed high-power laser are presented. Both pulsed and steady-state simulation experiments were performed utilizing a megawatt peak power pulsed CO2 laser. The steady-state simulation experiments were carried out in a vacuum chamber with graphite, Lucite and lithium fluoride as solid propellants. The pulsed experiments consisted of ballistic pendulum measurements of thrust, wall pressure traces, and streak camera records of plasma velocity to deduce the efficiency of a laser powered pulsejet, where air is utilized as fuel. Results indicate that for steady-state propulsion a high ratio of thrust to laser power (~ 10-100 dynes/w) can be obtained by using the laser to simply vaporize a suitable solid propellant. However, for high specific impulse (~1000 sec) it is necessary to add energy to the vapor in a stable manner. This may require gaseous propellants with external control over the absorption characteristics for stable heating in a throatless nozzle. The pulsejet experiments resulted in a ratio of thrust to laser power ~ 25 dynes/w. In order to increase the efficiency of propellant mass utilization, shorter laser pulses with higher power are desirable.