为了获得气体流速分布均匀性对激光器注入能量和输出能量的影响，运用计算流体动力学(CFD)方法对放电区流场进行模拟分析，得到放电区气体流速的纵向分布和竖向分布。根据影响流速分布不均匀性的因素，对整个流场进行优化改进。根据流体动力学原理及激光器结构及其轻量化要求，在原有结构基础上增加3层隔板以改善流场分布特性。优化后，放电区气体平均流速达到99.3 m/s，流速的纵向不均匀度为5.2%，竖向不均匀度为7.1%。激光器的重复频率由300 Hz提高到365 Hz，单脉冲注入能量由160 J提高到171.5 J，输出能量由20 J提高到21.8 J，激光发散角减小了0.5 mrad。改善放电区流场分布特性可提高激光器的整体性能。

In order to understand the effect of gas velocity distribution uniformity on injected energy and output energy of lasers, the flow field in discharge chamber is simulated by computational fluid dynamics (CFD) so that the gas velocity distribution in longitudinal and vertical directions can be acquired. According to the elements that affect the gas velocity uniformity, the whole flow field is optimized. Based on the fluid dynamics, laser structure and light weight requirement, three clapboards are added to improve the flow field distribution characteristics. After optimization, the average gas velocity reaches 99.3 m/s. The velocity non-uniformity in longitudinal direction is 5.2%, and that in vertical direction is 7.1%. The repetition rate of laser increases from 300 Hz to 365 Hz, the injected energy of single pulse increases from 160 J to 171.5 J, the output energy increases from 20 J to 21.8 J, and the divergence angle of laser beams decreases by 0.5 mrad. Improving flow field distribution characteristics in the discharge chamber will enhance the integral performance of lasers.