高能化学激光多物理场耦合数值模拟

doi:10.11949/0438-1157.20190344

摘要/Abstract

摘要：

高能化学激光是利用大量化学物质的原子受激辐射产生发光现象，为了合理解析这种过程，构建了多物理模型耦合计算体系，所构建的数值模拟体系包含了流场-化学场计算模块、光场计算模块和热-结构计算模块。三种物理过程强烈的时间尺度反差给多物理场耦合计算带来了困难，因而提出了非同步多时间尺度耦合策略，使全三维、高分辨率大尺度化学激光的模拟成为可能，以氧碘化学激光为例，数值解析了超音速化学氧碘激光器流动、光场演变及腔镜系统内各光学元件在激光辐照下的热力学过程，计算结果能直接反映激光器包括功率和光束质量等最为重要的性能指标，是实现高能激光关键问题辨析和优化设计的重要工具。

关键词: 化学激光, 数值模拟, 流动, 热力学过程, 光学计算

Abstract:

High-energy chemical laser is a phenomenon that uses a large amount of chemical atomic stimulated radiation to generate luminescence. To analyze this process, a multi-physical coupling calculation is constructed. The numerical platform consists of chemical flow, optical and thermal-structural calculation. However, the characteristic time difference of the three physical processes will make it difficult to decide the time scale for the coupled simulation. Therefore, an asynchronous multi-time scale coupling strategy is proposed. Three-dimensional, high resolution and large-scale chemical laser numerical simulations have been performed. In this paper, a chemical oxygen-iodine laser simulation is carried out. The flow field, optical field and the cavity mirrors of the laser are numerically analyzed. The calculation can evaluate the most important parameters of the laser, including power and beam quality. The constructed numerical method is an important tool to investigate and optimize chemical lasers.

Key words: chemical laser, numerical simulation, flow, thermodynamics process, optical calculation

中图分类号:

O 64

怀英, 贾淑芹, 吴克难, 陈曦. 高能化学激光多物理场耦合数值模拟[J]. 化工学报, 2019, 70(11): 4298-4305.

Ying HUAI, Shuqin JIA, Kenan WU, Xi CHEN. High-energy chemical laser multiphysics coupling numerical simulation[J]. CIESC Journal, 2019, 70(11): 4298-4305.

图/表 12

图1 耦合计算总体结构框图

Fig.1 Structure of coupling simulation

图2 非同步多时间尺度耦合仿真技术计算流程示意图

Fig.2 Flowchart of asynchronous multi-time scale coupling simulation

图3 实验平台

Fig.3 Experimental platform

表1 流场边界条件

Table 1 Boundary conditions of flow calculation

主流							辅流
压力/Pa	温度/K	质量分数/%					压力/Pa	温度/K	质量分数/%
压力/Pa	温度/K	O₂(³Σ)	O₂(¹Δ)	H₂O	Cl₂	N₂	压力/Pa	温度/K	I₂	N₂
3500	250	22	30	8	15	25	10000	400	30	70

图4 喷管切面上马赫数，碘的质量分数和小信号增益

Fig.4 Contour plot of Mach number, iodine mass fraction and small signal gain on nozzle cross-section

图5 垂直于光轴（z轴）的增益分布/m-1

Fig.5 Gain distribution on a cavity cross-section/m-1

图6 光场计算模式示意图

Fig.6 Schematic diagram of optical calculation

图7 归一化腔内双向总光强

Fig.7 Normalized intensity on cavity cross-section

图8 归一化前反射镜温度和形变分布

Fig.8 Normalized temperature and deformation distribution on cavity mirror

图9 归一化石英窗口镜温度和形变分布

Fig.9 Normalized temperature and deformation distribution on quartz window mirror

图10 MSE随迭代次数的变化曲线

Fig.10 MSE plot along iterations

图11 输出光强分布

Fig.11 Output intensity distribution

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