Spectroscopic Emission Measurements Within the Blunt-Body Shock Layer in an Arcjet Flow
Spectroscopic Emission Measurements Within the Blunt-Body Shock Layer in an Arcjet Flow
复制标题
电弧喷射流中钝体激波层内的光谱发射测量
DOI：
10.2514/2.6344
复制
发表时间：
1998
影响因子：
2.1
通讯作者：
S. Sharma
中科院分区：
文献类型：
--
作者：
Chung S. Park;M. Newfield;D. Fletcher;T. Gokcen;S. Sharma
在本研究中，在美国宇航局艾姆斯研究中心的20兆瓦电弧喷射装置上测量了一个直径为15. 24厘米的圆柱体模型上的自由流和激波层气流发出的辐射。测试气体是氩气和空气的混合物。空间分辨发射光谱，获得了在200- 890 nm的波长范围内使用的电荷耦合器件相机（1024 - 3 - 256阵列）连接到摄谱仪。使用钨和氘辐射源校准光学系统。分析工具被用来确定下列线的视线平均的apricproperties从校准的光谱：1）旋转温度的自由电子和2）旋转，振动，电子温度，和物种数密度的冲击层。进行了分析，以估计所确定的属性的不确定性界限。
In the present study, radiation emanating from the freestream and shock-layer e ow over a 15.24-cmdiam, e at-faced cylinder model was measured in the NASA Ames Research Center’ s 20-MW Arcjet Facility. The test gas was a mixture of argon and air. Spatially resolved emission spectra were obtained over a 200- to 890-nm wavelength range using a charged-coupled device camera (1024 3 256 array) attached to a spectrograph. The optical system was calibrated using tungsten and deuterium radiation sources. Analytical tools were used to determine the following line-of-sight-averaged thermodynamicproperties from the calibrated spectra: 1 ) rotational temperature of the freestream and 2 ) rotational, vibrational, electronic temperatures, and species number densities within the shock layer. An analysis was performed to estimate the uncertainty bounds of the determined properties.