摘要
提出使用低温吸附泵代替传统的机械真空泵和洗消装置的设想,以大幅降低电激励连续波HF/DF化学激光器的体积和重量。针对该技术需将常用的氦稀释剂替换为氮稀释剂从而引起激光器效率大幅下降的问题,对超音速阵列喷管激光器进行了研究。为提高氮稀释剂激光器效率,研制了周期4 mm间隔排列的狭缝-列孔超音速阵列喷管,以代替传统的单通道燃料流横向注入增益发生器。以HF激光为例的实验表明:前者在放电管电极间距仅为后者一半的条件下,单管激励出的光功率由25 W提高到90 W,电光转换效率由0.8%提升到5.9%,燃料利用效率提高近4倍,从仅为氦稀释剂运转情形的一半变为略高于氦稀释剂情形。这些结果表明,通过专门研制的超音速阵列喷管大幅提高了氮稀释电激励连续波HF/DF激光器的效率。
A cryogenic adsorption technique was presented to replace the machinery pump and exhaust processing system,which could provide a possible way to greatly suppress the size of a discharge-driven CW HF/DF chemical laser.As the nitrogen diluent must be used instead of helium for the cryogenic adsorption pump,the efficiency of HF/DF chemical laser would be lowered down greatly.To solve the problem,a periodically arranged supersonic nozzle array composed of slit and conical holes with a 4 mm period was developed to replace the traditional single slit transverse sonic fuel injecting gain generator.Experimental results with HF laser demonstrates that the laser output and electrical-optical efficiency by designed supersonic nozzle array have been increased from 25 W to 90 W,and 0.8% to 5.9%,respectively.Furthermore,the fuel specific efficiency has a nearly fourfold increase,which is slightly higher than that from the helium diluen.Obtained results prove that the efficiency of the nitrogen diluted discharge-driven CW HF/DF chemical laser can be greatly improved by using the devel-oped supersoinc nozzle array.
出处
《光学精密工程》
EI
CAS
CSCD
北大核心
2011年第2期304-309,共6页
Optics and Precision Engineering
基金
国防预研基金资助项目
关键词
化学激光
低温吸附
氮稀释剂
电激励
阵列喷管
chemical laser
cryogenic adsorption
nitrogen diluent
discharge-driving
nozzle array
