| 高温激波层CO2辐射与传输特性数值计算研究 |
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| 引用本文： | 庞明琪,刘海峥,张代军,史泽林.高温激波层CO2辐射与传输特性数值计算研究[J].红外与激光工程,2022,51(4):20210376-1-20210376-10. |
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| 作者姓名： | 庞明琪 刘海峥 张代军 史泽林 |
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| 作者单位： | 1.中国科学技术大学 自动化系，安徽 合肥 230027 |
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| 基金项目： | Foundation of National Defense Key Laboratory of the Chinese Academy of Science（CXJJ-16 S027） |
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| 摘 要： | CO2是中、短波红外探测的主要辐射噪声源，目前针对高温CO2辐射和传输特性的研究尚不明晰。重点研究了激波层中CO2的吸收作用，并对CO2热辐射及光敏面各辐射分量占比进行了计算与分析。采用改进的切线平板法求解辐射传输方程，并考虑了目标与窗口辐射对激波层内辐射场分布的影响，据此推导了激波层红外辐射和传输特性计算模型，最后给出了探测器光敏面各辐射分量及占比计算模型。对某型超声速红外制导导弹飞行高度h=1 km、飞行速度Ma=3~5时激波层特性进行仿真计算，结果表明:中波波段激波层透过率低于短波波段，但总体来说可忽略激波层吸收作用；飞行速度增加导致CO2辐射噪声区间向长波方向拓宽，Ma≥4、h=1 km时，4.4 μm以上波段有严重的CO2辐射噪声淹没目标信号，截止波长为4.4 μm的滤波器无法适用。
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| 关 键 词： | 超声速 高温激波 辐射传输 辐射噪声 |
| 收稿时间： | 2021-06-07 |
A numerical study of carbon dioxide radiation and transmission property in high temperature shock layer |
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| Affiliation: | 1.Department of Automation, University of Science and Technology of China, Hefei 230027, China2.Key Laboratory of Opto-Electronic Information Processing, Chinese Academy of Sciences, Shenyang 110016, China3.Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang 110016, China4.Institutes for Robotics and Intelligent Manufacturing, Chinese Academy of Sciences, Shenyang 110169, China |
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| Abstract: | CO2 is the main source of radiation noise in mid-infrared and short-infrared detection. The research on radiation and transmission property of CO2 at high temperature is still not clear at present. The absorption effect of CO2 in the shock layer was mainly studied, and the thermal radiation of CO2 and radiation component proportion on the photosensitive surface were analyzed and calculated. The improved tangent-slab approximation method was used to solve the radiative transport equation, and the influences of target and window radiation on the radiation field distribution in the shock layer were considered. Based on this, the radiation and transmission property of shock layer were deduced. Finally, the calculation model of each radiation component and proportion of the photosensitive surface was given. The property of the shock layer of a supersonic missile at an altitude of h=1 km and flight speed of Ma=3-5 was simulated and calculated. The results showed that the transmittance of shock layer in mid-wave bands is lower than that in short-wave band, but shock layer absorption can be ignored in general. The increase of flight speed leads to a broadening of the CO2 radiated noise region to the long-wave direction, and the target signal is submerged seriously by CO2 radiation noise in the band above 4.4 μm under condition of Ma≥4 and h=1 km, the filter with a cutoff wavelength of 4.4 μm is not suitable. |
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