超音速化学氧碘激光器能量提取对流场影响的数值研究

Numerical Study of Effects of Power Extraction on Flow Fields in Supersonic Chemical Oxygen Iodine Lasers

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 chemical oxygen iodine laser is a complex process including flow,chemical reactions and lasing.In process of power extraction,output of laser has a direct influence on flow fields and species,which will affect beam quality and power of lasers.Influence of power extraction on inner flow field of the laser has been numerically investigated based on computational fluid dynamic coupling procedures of paraxial wave function.Numerical results show that as power extraction process takes place,consumption of singlet delta oxygen is enhanced since pumping reaction is accelerated,concentration of iodine molecule is elevated,and changing direction of intracavity temperature via power extraction process depends on extraction efficiency.Intracavity temperature arises in high extraction efficiency cases and decreases in low extraction efficiency cases.Computational method in this paper provides an effective tool for research and development of chemical oxygen iodine lasers.