主稀释剂He预热对燃烧驱动DF激光器输出性能的影响分析

针对燃烧驱动连续波DF激光器，对仅预热主稀释剂He的情况下激光器的输出性能进行了理论分析和仿真研究，并与燃料常温条件的结果进行了对比分析。对于燃料体系为(H2+NF3+He)+D2和(C2H4+NF3+He)+D2的DF激光器，在燃烧室产生的F原子流量不变的条件下，当主He预热至(1100 K,1300 K)时，激光器比功率较常温条件下分别约提高了(21%, 24%)和(46%, 56%)，同时燃烧室所需的燃料消耗分别约减少了(25.5%, 29%)和(32%, 36%)。在工程应用方面，主He可成功预热至800 ℃（1100 K）。因此，主He预热是有效且可行的燃料预热方案，有利于改善激光器的输出性能，为激光器的高效率和紧凑化发展进程提供新的技术路线。
A theoretical and simulated calculation of the processes proceeding in a gain generator of a combustion driven cw DF chemical laser with preheated primary dilution He was reported. Investigation results demonstrate that for DF lasers with fuel systems of (H2+NF3+He)+D2 and (C2H4+NF3+He)+D2, when the primary dilution He is preheated to (1100 K,1300 K), the available specific output power is improved by (21%, 24%) and (46%, 56%) respectively; and at the same time, the fuel consumption in the combustor is reduced by (255%, 29%) and (32%, 36%) respectively. In practical application, the primary dilution He can be heated to 800℃(1100 K) successfully. Therefore, preheating the primary dilution He is a feasible and effective method to improve the laser output characteristics, which can facilitate the development of more compact chemical lasers with higher efficiency.