多尺度多线组宽带k分布模型参数优化方法  

Parameter optimization of multi-scale multi-group wide-band k-distribution models

作　　者：吴越 胡海洋[1] 王强[1] 段然 谢业平 邓洪伟 WU Yue;HU Haiyang;WANG Qiang;DUAN Ran;XIE Yeping;DENG Hongwei(School of Energy and Power Engineering,Beijing University of Aeronautics and Astronautics,Beijing 100191,China;Science and Technology on Optical Radiation Laboratory,Beijing Institute of Environmental Features,Beijing 100854,China;Shenyang Engine Research Institute,Aero Engine Corporation of China,Shenyang 110015,China)

机构地区：[1]北京航空航天大学能源与动力工程学院,北京100191 [2]北京环境特性研究所光学辐射重点实验室,北京100854 [3]中国航发沈阳发动机研究所,沈阳110015

出　　处：《航空动力学报》2024年第2期32-46,共15页Journal of Aerospace Power

基　　金：国家科技重大专项(J2019-Ⅲ-0009-0053)。

摘　　要：针对喷气式飞行器跨声速排气系统的高温固壁与尾喷流的发射红外辐射及其在大气中的远距离传输衰减特性的数值计算,将现有多尺度多线组宽带k分布气体辐射模型MSMGWB(multi-scale multi-group wide-band k-distribution model)从3~5μm波段扩展到2~2.5、3.7~4.8、7.7~9.7μm和8~14μm波段,并对模型光谱吸收系数分组组合与匹配高斯积分格式的寻优方法进行了改进。56个一维算例与真实结构跨声速排气系统远程红外成像算例计算结果表明,优化后的MSMGWB模型对比多线组统计窄带模型计算精度和效率都有明显提升,尤其在3~5μm和3.7~4.8μm波段,综合计算精度提升近一倍的同时,计算效率分别提升了4倍和1.5倍;对比国内主流目标远程红外特性计算方法,综合计算精度提升更大,计算效率则提升了1个量级左右。Considering the numerical calculation of remote infrared signal emitted by solid wall and hot combustion gas of jet aircraft’s transonic exhaust system,the existing multi-scale multi-group wideband k-distribution model(MSMGWB)was expanded from 3−5µm wave band to 2−2.5,3.7−4.8,7.7−9.7µm and 8−14µm wave bands.Moreover,the method of finding best combination of wavenumber subinterval grouping results and Gauss integral schemes was improved.The calculation results of 561D cases and a 3D real-structure transonic exhaust system remote infrared imaging case indicated that the optimized MSMGWB model significantly improved computation accuracy and efficiency compared with fictitious gas-based statistical narrow-band model,especially under 3−5µm and 3.7−4.8µm wave bands,the comprehensive calculation accuracy was nearly doubled,and the calculation efficiency was increased by 4 times and 1.5 times,respectively.At the same time,the optimized MSMGWB model’s comprehensive calculation accuracy was improved more significantly,and calculation efficiency was improved by about an order of magnitude compared with the domestic mainstream calculation method of target remote infrared signals.

关 键 词：气体辐射 K分布 宽带模型 多尺度多线组 红外成像 

分 类 号：V211.3[航空宇航科学与技术—航空宇航推进理论与工程]