针对一台单喉道的小型连续波DF化学激光器设计指标与实验结果的差别 ,利用数值方法对不同条件的喷管光腔冷流场进行模拟和诊断 ,分析了光腔中的F原子质量百分比浓度、静压和静温分布以及反应流场小信号增益系数分布 ,并与实验光斑定性地进行了比较 ,取得与实验观察一致的结果 ,从而为该小型DF激光器的改进措施确定提供了理论依据。 Aiming at the difference between design indexes and experimental results of a small continuous wave DF chemical laser with a single throat, the numerical simulation of the cold flow field of the nozzle cavity with different conditions is made. The F atom mass percentage Concentration, static pressure and static temperature distribution and small-signal gain coefficient distribution of the reaction flow field are compared qualitatively with the experimental spot, and the experimental results are consistent with the experimental results, which provides a theoretical basis for the improvement of this small DF laser .