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首页> 外文期刊>Journal of Thermophysics and Heat Transfer >Experimental Investigation of Air Radiation from Behind a Strong Shock Wave
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Experimental Investigation of Air Radiation from Behind a Strong Shock Wave

机译：强冲击波背后的空气辐射实验研究

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摘要

Radiation phenomena behind a strong shock wave have been experimentally investigated using a free-piston double-diaphragm shock tube. The shock front is detected by pressure sensors, whose rise time is calibrated by a laser schlieren technique. Using the simulated air as the test gas, spatial distribution of the emission spectra behind the shock front is obtained for the 270-520-nm wavelength range by means of the one-dimensional spatially resolved imaging spectroscopy, in which a wavelength vs position image is taken by an image-intensified charge-coupled device camera with an exposure time of 100 ns. Molecular spectra of the N_2 (2+) and the N_2~+ (1-) system are seen shortly after the shock front, whereas mainly we atomic line spectra from N are seen afterwards. Using pure nitrogen as the test gas, the rotational and vibrational temperatures of the molecules and the electronic excitation temperature of the atoms are determined, and their spatial distribution is obtained for a shock velocity of 11.9 km/s at an ambient pressure of 0.3 torn The measured temperatures are in significant nonequilibrium with the translational temperature. Also, the temperatures of N_2~+ are much higher than those of N_2.
机译：已经使用自由活塞双膜片式冲击管对实验中的强冲击波背后的辐射现象进行了研究。压力传感器检测到冲击前，其上升时间通过激光纹影技术进行校准。使用模拟空气作为测试气体，通过一维空间分辨成像光谱，获得了在270-520nm波长范围内激波前沿后面的发射光谱的空间分布，其中波长与位置图像为由图像增强型电荷耦合器件相机以100 ns的曝光时间拍摄。 N_2（2+）和N_2〜+（1-）系统的分子光谱在冲击前沿后不久出现，而我们主要从N看到原子线谱。使用纯氮气作为测试气体，确定了分子的旋转和振动温度以及原子的电子激发温度，并在0.3撕裂的环境压力下以11.9 km / s的冲击速度获得了它们的空间分布。测量的温度与平移温度明显不平衡。而且，N_2〜+的温度比N_2的温度高得多。

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