氧碘化学激光器超声速段射流工作方式性能的数值研究
Numerical study on performance of COIL with supersonic jet in supersonic section
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摘要: 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维计算流体动力学技术，通过求解层流Navier-Stokes方程与组分输运方程对简化的氧碘化学激光RADICL模型进行数值模拟与分析，结合10种组分和21个基元反应的化学反应模型，对COIL超声速段射流情况下喷管内的流动及混合情况，尤其是产率、分解率、泵浦率和小信号增益系数的细致3维空间分布进行研究。结果证明超声速段进行射流有利于提高COIL的性能表现，可以充分利用高增益区，光腔位置增益可以达到0.012 cm-1，与亚声速段射流相比总压恢复性能提高，混合有待加强。Abstract: There are strong interactions or couplings among multi-fields in the mixing nozzle of the chemical oxygen-iodine laser(COIL), such as gas-dynamics, chemical reaction kinetics and optics. In this paper, three-dimensional computational flow dynamic technology was applied on the research assessment device improvement chemical laser model by solving the laminar Navier-Stokes equations and transportation equations to study iodine molecule dissociation rate, iodine atom pumping rate, singlet oxygen yield rate and small signal gain distributions. The simulation was done in the condition of that the secondary flow jet would take place in the supersonic section of the nozzle. The detailed flow field and distribution of yield, dissociation and pumping rates were investigated. The distribution charac
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