CAJ | 학술논문

飞行器以很高的马赫数再入大气层时，头部激波层、尾迹的气体辐射产生的紫外、可见、红外特征信号，是地面监测和反导制导系统探测、识别的主要依据；同时，头部气体层热辐射也是再入体壁面加热热流的重要源项。激波层内高温气体吸收系数是目标紫外、可见光、红外辐射特性计算、热防护计算和气动流场辐射场耦合计算的基本参数。本文分析了再入过程中高超声速稀薄气体流的非平衡现象，采用三温度模型(电子能温度Te、振动能温度TV、转动和平动能温度TR)来表征激波层内非平衡态的气体组份各个能级占有数分布，并由原子分子辐射理论直接计算N2, N+2, N, N+, O2, O+2, O, O+, NO, NO+和e-等11种主要空气组元各种能级跃迁对辐射的贡献，最终得到平稀和非平衡高温空气吸收系数计算模型。计算结果可见光区与试验结果符合较好，紫外、红外区结果稍差。
비행기이흔고적마혁수재입대기층시，두부격파층、미적적기체복사산생적자외、가견、홍외특정신호，시지면감측화반도제도계통탐측、식별적주요의거；동시，두부기체층열복사야시재입체벽면가열열류적중요원항。격파층내고온기체흡수계수시목표자외、가견광、홍외복사특성계산、열방호계산화기동류장복사장우합계산적기본삼수。본문분석료재입과정중고초성속희박기체류적비평형현상，채용삼온도모형(전자능온도Te、진동능온도TV、전동화평동능온도TR)래표정격파층내비평형태적기체조빈각개능급점유수분포，병유원자분자복사이론직접계산N2, N+2, N, N+, O2, O+2, O, O+, NO, NO+화e-등11충주요공기조원각충능급약천대복사적공헌，최종득도평희화비평형고온공기흡수계수계산모형。계산결과가견광구여시험결과부합교호，자외、홍외구결과초차。
As a reentry vehicle traveling through atmosphere with a very high Mach number, the ultraviolet, visible light and infrared signatures, produced from its head shock-wave layer and wake, are the foundation of detecting and identifying for the ground monitoring and the antimissile controlling and guiding system. At the same time, the gas layer radiation is also an important source of heating flux to the wall. The absorption coefficients of high temperature gas in the head shock-wave layer are basic parameters for calculations of the target ultraviolet, visible light and infrared optical characteristics, the heat shield and the aerodynamic flow-field coupling with thermal radiation. In this paper, after the thermo-chemical non-equilibrium phenomenon of hypersonic rarefied flow during reentry stage is discussed, a three-temperature model (electronic temperature Te, vibrational temperature TV and rotational-transitional temperature TR) is used to characterize energy levels population of non-equilibrium air species in the shock-wave layer and the contribution of 11-species such as N2, N+2, N, N+, O2, O+2, O, O+, NO, NO+ and e- is directly calculated by using the atomic and molecular radiation theory. At last, a model is established, which calculates the absorption coefficient of high-temperature equilibrium or non-equilibrium air. The results are in good agreement with experimentally measured data in the visible region, but are slightly bad in the ultraviolet and infrared regions.