Nonequilibrium and equilibrium shock front radiation measurements
Nonequilibrium and equilibrium shock front radiation measurements
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非平衡和平衡激波锋面辐射测量
DOI：
10.2514/6.1990-139
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
W. Gillespie
中科院分区：
文献类型：
--
作者：
S. Sharma;W. Gillespie
在电弧驱动激波管中测量氮气中正常激波后发出的辐射强度，激波速度为 6.2 km/s。进行了时间分辨宽带辐射强度测量和时间冻结光谱测量。时间冻结测量是通过在出射焦平面处配备有 700 个元件的线性二极管阵列的 0.3 米光谱仪进行的，每个元件的光谱分辨率为 0.3A。通过分析 3153-3159-A 波长范围内的第二正 N2 系统，可以确定平衡区和非平衡区的旋转和振动温度。结果与 AVCO-Everett 研究实验室在 20 世纪 60 年代获得的类似数据进行了比较。本实验得到的弛豫时间和平衡区温度与AVCO结果一致，但非平衡区振动和旋转温度与AVCO结果有很大差异。测量的旋转温度似乎处于非平衡状态，与帕克的二温度假设相矛盾，但测量的振动温度与帕克的模型一致。
The intensities of the radiation emitted behind a normal shock wave in nitrogen were measured in an electric-arc driven shock tube, at a shock velocity of 6.2 km/s. Both a time-resolved broadband radiation intensity measurement and a time-frozen spectral measurement were conducted. The time-frozen measurement was made by a 0.3-m spectrograph equipped with a 700-element linear diode array at the exit focal plane, which gave a spectral resolution of 0.3A per element. By analyzing the second positive system of N2 in the 3153-3159-A wavelength region, the rotational and vibrational temperatures are determined in both the equilibrium and the nonequilibrium regions. The results are compared with similar data obtained by the AVCO-Everett Research Laboratory during the 1960s. The relaxation times and the temperature in the equilibrium region obtained in the present experiment agree with those of AVCO, but the vibrational and rotational temperatures in the nonequilibrium region are greatly different from the AVCO results. The measured rotational temperature seems to be in nonequilibrium, contradicting the two-temperature assumption of Park, but the measured vibrational temperature agrees with Park's model.