高超声速再入试验的辐射光谱定量测量

余晓娅; 刘立拓; 李瑞; 王同权

doi:10.3788/CO.20201301.0087

高超声速再入试验的辐射光谱定量测量

doi: 10.3788/CO.20201301.0087

余晓娅^{1, †,},
刘立拓^{2, †, ,},
李瑞¹,
王同权¹

1.
试验物理与计算数学重点实验室, 北京 100094
2.
中国科学院微电子研究所, 北京 100024

基金项目:

国家自然科学基金青年项目 61404171

详细信息

作者简介:
余晓娅(1985-), 女, 河南柘城人, 博士, 助理研究员, 主要从事目标光学特性测量方面的研究。Email:may19850225@sina.com

刘立拓(1982-), 男, 河北保定人, 博士, 主要从事光学检测方面的研究工作。Email:liulituo@ime.ac.cn

中图分类号: V211.74
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出版历程
- 收稿日期: 2019-09-09
- 修回日期: 2019-11-08
- 刊出日期: 2020-02-01

Measurements of absolute radiative emissions for supersonic reentry

YU Xiao-ya^{1, †
,},
LIU Li-tuo^{2, †
, ,},
LI Rui¹,
WANG Tong-quan¹

1.
Key Laboratory of Experimental Physics and Computational Mathematics, Beijing 100094, China
2.
Institute of Microelectronics, Chinese Academy of Sciences, Beijing 100024, China

Funds:

National Natural Science Foundation of China Youth Project 61404171

More Information

Corresponding author: LIU Li-tuo, Email:liulituo@ime.ac.cn

摘要

摘要: 利用膨胀管对宽度为45 mm和90 mm的半圆柱模型进行了地球再入高超声速流动试验，再入速度为8 km/s。试验利用配有ICCD相机的光谱仪，测量了具有空间分辨的激波后辐射光谱，光谱范围为250~550 nm，得到了沿流体方向的激波辐射轮廓线。分析发现在该光谱范围内辐射主要为CN（B-X）带系分子光谱。利用卤钨灯对该波段光谱进行定标，得到了激波层辐射的绝对辐射亮度。通过采用两种模型辐射亮度对模型宽度归一化后发现，绕流场高温气体辐射存在较强的自吸收现象，同时观测到了绕流场激波的三维效应。通过实验发现，CN（B-X）Δv=0带系的3-3振动带系385.2 nm波长位置和0-0带系388.4 nm波长位置辐亮度之比随着流场靠近模型边缘而逐渐下降，这表明激波层内辐射的动态非平衡特征。
- 膨胀管 /
- 高超声速流动 /
- 辐射定量测量
Abstract: An expansion tube facility was operated using two half-cylinder models with width of 45 mm and 90 mm respectively for producing high-enthalpy flows at the nominal velocity of 8 km/s relevant to Earth reentry. Spatially resolved emission spectroscopy in the wavelength range from 250 nm to 550 nm behind a shock wave was recorded by a spectrometer with ICCD camera. Shock wave stagnation streamline was observed along the flow direction. It is found that the spectrum are dominated by the CN(B-X) violet band. A halogen tungsten lamp was used to realize calibration and the absolute radiation luminance of the shock layer was obtained. By comparing the model widths normalized by two kinds of model radiances, it can be found that there is a strong self-absorption of high temperature gas radiation around the flow fluid. In addition, three-dimensional effect was observed. It can be found that the ratio between spectral radiance at 385.2 nm in the CN(B-X) violet 3-3 band and spectral radiance at 388.4 nm in the CN(B-X) violet 0-0 band is decreasing along the distance toward the model edge. The results illuminated that dynamical non-equilibrium features exists in the shock layer along the distance of the model edge.
- expansion tube /
- hypersonic flow /
- absolute radiation measurement
注释:

1) †共同贡献作者

HTML全文

图 1 JF-16原理示意图

Figure 1. Principle diagram for JF-16

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图 2 JF-16实验测量系统示意图

Figure 2. Schematic diagram of measurement system in JF-16

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图 3 测量模型

Figure 3. Test model

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图 4 光谱响应标定结果

Figure 4. Calibrated spectral response

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图 5 实验光谱数据

Figure 5. Spectral data of two models

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图 6 距离模型边缘2 mm处光谱辐亮度

Figure 6. Spectral radiance at the vertical distance of 2 mm from the edge in model 1 and model 2

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图 7 模型1和模型2在距离模型边缘2 mm处光谱辐亮度比值

Figure 7. Spectral radiance ratio between model 1 and model 2 at the vertical distance of 2 mm from the edge

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图 8 模型1在388.4 nm和385.2 nm处激波沿流场方向分布

Figure 8. The shock layer radiance distributions along flow field at the wavelength of 388.4 nm and 385.2 nm for model 1

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图 9 385.2 nm和388.4 nm处光谱辐亮度比值沿模型边缘变化情况

Figure 9. Spectral radiance ratio between 385.2 nm and 388.4 nm varies along distance from model edge

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表 1 初始参数和测量条件

Table 1. Initial parameters and test conditions

Parameters	Values	Gas
Driver gas pressure/MPa	1.0	H₂, O₂
Test gas/Pa	3000	Air
Acceleration gas/Pa	20	Air
Velocity/km·s^-1	8	-
Total enthalpy/MJ·kg^-1	36	-

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