COIL基于小信号增益系数的最佳流量配比选择

 氧碘化学激光器(COIL)的混合喷管内发生的是气体动力学、化学反应动力学以及光学等相互耦合的复杂过程，每个过程都对COIL性能有着至关重要的影响。利用3维CFD技术，通过求解层流Navier-Stokes方程与组分输运方程，结合10种组分和21个基元反应的化学反应模型，对简化后的化学氧碘激光RADICL模型在亚声速段横向射流情况下，不同的主副流流量配比对小信号增益系数的影响情况进行了比较与分析。结果证明:过高或过低的碘分子浓度均不利于产生合理的小信号增益系数;存在最佳流量配比使小信号增益系数得到显著提高且分布均匀。

Optimization of flow rate ratio of primary to secondary flow in COIL based on gain distribution

There are strong interactions or couples among multi-fields in the mixing nozzle of the COIL, such as gas-dynamics, chemical reaction kinetics and optics. Three-dimensional CFD technology was applied on the RADICL model by solving the laminar Navier-Stokes equations and transportation equations to study the small signal gain distributions. A simulation was done in the condition of different flow rate ratio of primary to secondary flow. Results show that the appropriate flow rate ratio plays an important role on the spatial distribution of the small signal gain. Both too high and too low concentration of iodine goes against the proper gain.