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首页> 外文期刊>Transactions of the Japan society for aeronautical and space sciences >Analysis of Shock Layer Radiation from the Vacuum-Ultraviolet to Near-Infrared Regions
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Analysis of Shock Layer Radiation from the Vacuum-Ultraviolet to Near-Infrared Regions

机译：真空紫外至近红外区域激波层辐射分析

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摘要

Shock layer radiation is observed in the wavelength range from vacuum-ultraviolet (VUV) to near-infrared (NIR) using a free-piston double-diaphragm shock tube. In the VUV region, atomic lines of N and C are predominant and no molecular band spectra are seen. In the ultraviolet (UV) region, the molecular bands of N_2(2+) and N_2+(l—) systems are predominant. In the visible (VIS) and NIR regions, atomic lines of N are intense, and weak molecular bands of the N_2(1+) system are seen. The spectrum in the VUV region becomes more intense than that in the UV region with increasing shock velocity. On the other hand, the spectrum in the UV region is almost same with increasing shock velocity. The measured spectrum is analyzed using the radiation analysis code SPRADIAN 2. The analysis shows that the numerical spectrum can reproduce the measured one when the electronic excitation temperature is higher than the vibrational temperature. The electronic excitation temperature is evaluated from the atomic lines of nitrogen in a wide wavelength range and the spatial distribution is obtained. The result shows the electronic excitation temperature is higher than the vibrational temperature immediately behind a shock wave, consistent with the result obtained from the spectrum analysis.
机译：使用自由活塞双膜片减震管，可以观察到从真空紫外线（VUV）到近红外（NIR）的波长范围内的减震层辐射。在VUV区域中，N和C的原子线占优势，并且看不到分子带谱。在紫外线（UV）区域，N_2（2+）和N_2 +（1-）系统的分子带占主导地位。在可见光（VIS）和NIR区域，N的原子线很强，并且可以看到N_2（1+）系统的弱分子带。随着冲击速度的增加，VUV区域中的光谱变得比UV区域中的光谱更强烈。另一方面，随着冲击速度的增加，紫外线区域的光谱几乎相同。使用辐射分析代码SPRADIAN 2对测得的光谱进行分析。分析显示，当电子激发温度高于振动温度时，数字光谱可以重现测得的光谱。从宽波长范围内的氮原子线评估电子激发温度，并获得空间分布。结果表明，电子激发温度高于冲击波后的振动温度，这与频谱分析的结果一致。

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