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首页> 外文期刊>Transactions of the Japan society for aeronautical and space sciences >Shock Layer Radiation Analysis using a Hypervelocity Shock Tube (HVST)
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Shock Layer Radiation Analysis using a Hypervelocity Shock Tube (HVST)

机译：使用超高速冲击管（HVST）进行冲击层辐射分析

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摘要

Spectroscopic measurement is conducted using a free-piston double-diaphragm shock tube to investigate the non-equilibrium phenomena in the shock layer. The shock velocity and spectrum position correlated to the shock front are determined using a double-laser schlieren measurement system for precise localization. Emission spectra of N2O+), N_2(2+) and N_2+(1-) band systems are obtained by means of time-frozen imaging spectroscopy. A spectrum fitting method is used to determine the rotational and vibrational temperatures from the measured spectra, and temperature distribution correlated to the shock front is finally obtained. The measured rotational temperatures are in high nonequi-librium with the translational temperature expected from the numerical prediction of the two-temperature model. The measured rotational temperature for N_2(2+) is lower than those for N_2(1+) and N_2+(1-) immediately behind a shock wave. Hence, rotational relaxation for the N_2C state looks slower than those for the N_2B and N_2+ B states. On the contrary, the measured vibrational temperatures forN_2(l+), N_2(2+)andN_2+(1-) are close to each other, and agree well with the numerical prediction of the two-temperature model. The experiment and numerical analysis suggest that the electronic excitation temperature is in nonequilibrium with the vibrational temperature.
机译：使用自由活塞双隔膜激波管进行光谱测量，以研究激波层中的非平衡现象。与冲击前沿相关的冲击速度和频谱位置是使用双激光schlieren测量系统确定的，用于精确定位。通过时间冷冻成像光谱法获得了N2O +，N_2（2+）和N_2 +（1-）波段的发射光谱。频谱拟合法用于根据测得的频谱确定旋转和振动温度，最终获得与冲击前沿相关的温度分布。测得的旋转温度处于高非平衡库中，而平移温度是根据两温模型的数值预测得出的。 N_2（2+）的测量旋转温度低于紧接在冲击波后面的N_2（1+）和N_2 +（1-）的旋转温度。因此，N_2C状态的旋转松弛看起来比N_2B和N_2 + B状态的旋转松弛慢。相反，N_2（l +），N_2（2+）和N_2 +（1-）的测量振动温度彼此接近，并且与两温模型的数值预测吻合良好。实验和数值分析表明，电子激发温度与振动温度不平衡。

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