Fabry–Perot spectroscopy for kinetic temperature and velocity measurements of a high enthalpy air plasma flow
Fabry–Perot spectroscopy for kinetic temperature and velocity measurements of a high enthalpy air plasma flow
复制标题
用于高焓空气等离子体流的动力学温度和速度测量的法布里-珀罗光谱
DOI：
10.1088/1361-6463/aa7b0c
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
H. Fulge
中科院分区：
文献类型：
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作者：
F. Zander;S. Löhle;T. Hermann;H. Fulge
用法布里-珀罗光谱法测量了低压、高焓空气等离子体的原子平动温度和速度。这里给出的测量是用这个系统在这个焓水平上的第一次测量。该独特系统的亚皮米分辨率允许对等离子体中的原子种类进行精确的平移温度和速度测量。该检测系统允许同时测量多个原子氮和氧谱线的多普勒展宽。此外，有两个光路，一个垂直于流和一个在45度允许多普勒频移测量。在三个不同的等离子体风洞试验中进行了测量。测得平均原子氮温度为1.08±0.11×104 K，原子氧平动温度为1.23±0.12×104 K。热非平衡的测定证实了先前对相同现象的测量，然而，其背后的机制尚未确定。测量的平均流速为3350±840 m s−1，在原子种类之间是一致的。平动温度和速度约占流动局部焓的35%。这些参数的直接测量，消除了以前需要的假设，大大提高了流动特性的保真度。这允许在该流场中进行高质量的测试。
The atomic translational temperatures and velocities of a low pressure, high enthalpy air plasma are measured using Fabry–Perot spectroscopy. The measurements presented here are the first measurements using this system at this enthalpy level. The sub-picometre resolution of the unique system has allowed accurate translational temperature and velocity measurements of the atomic species in the plasma. The detection system allows the Doppler broadening of multiple atomic nitrogen and oxygen lines to be measured simultaneously. Additionally, having two optical paths, one perpendicular to the flow and one at 45 deg. allows the Doppler shift to be measured. Measurements were taken during three different plasma wind tunnel tests. Mean atomic nitrogen temperatures of 1.08±0.11×104 K and atomic oxygen translational temperatures of 1.23±0.12×104 K were measured. The thermal non-equilibrium determined verified earlier measurements of the same phenomena, however, the mechanism behind this has not yet been determined. The mean measured flow velocity was 3350±840 m s−1 and was consistent between the atomic species. The translational temperature and velocity contribute approximately 35% of the local enthalpy of the flow. The direct measurement of these parameters, removing previously required assumptions, increases the fidelity of the flow characterisation significantly. This allows high quality testing to be conducted in this flow field.