激光化学微推进推力性能的实验研究

Experimental Investigation on Propulsion Performance of Laser Chemical Micro-propulsion

影响激光化学微推进推力性能的主要因素为激光和推进工质的参数。对不同厚度的自研制双基药复合工质进行了推力性能的实验研究。实验中,激光焦斑为50μm,激光功率密度为4.74×104W/cm2.实验发现随着工质厚度的增加,工质的冲量耦合系数有渐增的趋势,而比冲有渐减的趋势。将激光功率提高近1倍,选用功率为1.80 W的半导体激光器,25μm厚的双基药复合工质的冲量耦合系数和比冲分别达到了130.8 dyne/W和493.0 s,此时,名义上的激光能量利用率高达316.4%,是聚氯乙烯(PVC)工质的6.46倍,化学能的释放更加充分。

The parameters of laser and propellants are the main factors affecting the propulsion performance of laser chemical micro-propulsion. The thickness of propellant is an important experimental parameter under T-mode. Hence, the propulsion performances of complex double-base propellants with different thickness are studied experimentally. The experimental results show that the momentum coupling coefficient increases with the incease in thickness of propellant while the specific impulse reduces on the contrary. The effect of laser power density on the release of chemical energy is studied. When a semiconductor laser with the power of 1.80 W and the double-base propellant are used, the momentum coupling coefficient and specific impulse are 130.8 dyne/W and 493.0 s, respectively, while the laser energy coefficient is 316.4% , which is 6.46 times better than that of PVC propellant without the release of chemical energy.