超音速化学氧碘激光器(SCOIL)是一个集气体流动过程、化学反应过程和光学过程相互耦合的复杂系统。在激光能量提取过程中,光能的输出会导致流动增益介质各组分浓度及气动特性的改变。利用计算流体力学软件耦合傍轴波动方程求解程序,实现了三维Navier-Stokes流场控制方程与波动光学方程的全三维耦合计算,研究了出光过程中超音速流场及化学反应过程的变化。结果表明,此计算方法有效解析了能量提取过程对激光器流场、化学场诸参量的动态影响,光能提取过程促使气流中的单重态氧不断地提供抽运能量而被更快地消耗;在不同的提取效率下,腔内温度在光能提取前后的变化情况不同。 Supersonic chemistry Oxygen iodine laser (SCOIL) is a complex system that combines gas flow process, chemical reaction process and optical process. In the process of laser energy extraction, the output of light energy will lead to the change of concentration and aerodynamic characteristics of the components of the flow gain medium. The computational fluid dynamics software was used to couple the paraxial wave equation to solve the program, and the full three-dimensional coupling calculation of the three-dimensional Navier-Stokes flow field equation and the fluctuating optical equation was realized. The changes of the supersonic flow field and the chemical reaction process were studied. The results show that this calculation method can effectively analyze the dynamic effects of energy extraction process on laser flow field and chemical field parameters. The extraction of light energy causes the singlet oxygen in the flow to continuously supply pumping energy and be consumed more quickly. Under different extraction efficiencies, the temperature in the cavity changes before and after light extraction.