实验流体力学Issue(2)：79-83,5.DOI:10.11729/syltlx20140044
中红外吸收光谱测量激波风洞自由流中 NO 浓度和温度
Nitric oxide concentration and temperature measurement for shock tunnel free stream using mid-infrared absorption spectroscopy
曾徽 1余西龙 1李飞 1张少华1
作者信息
- 1. 中国科学院力学研究所 高温气体动力学国家重点实验室，北京 100190
- 折叠
摘要
Abstract
In this paper,JF-10 shock tunnel is driven by H2/O2 detonation and the free-stream contains some trace components which are generated by non-equilibrium processes such as ionization and dissociation.Tunable diode absorption spectroscopy (TDLAS)is used for tempera-ture and concentration measurement of nitric oxide in the free-stream and this quantitative meas-urement is helpful to understand the non-equilibrium processes.In the experiments,the test sec-tion’s static pressure of JF-10 shock tunnel is just several hPa.Thus,Doppler broadening domi-nates,which is caused by random thermal motion of the absorber species.The half width of Doppler broadening is temperature dependent and this functional relation provides a method for gas temperature and species concentration measurement.A mid-infrared quantum cascade laser of 5.2μm central wavelength is used and gas temperature and nitric oxide concentration are meas-ured using a single line of 1909.7cm-1 wavelength by direct absorption-wavelength scanning method under 2kHz scanning frequency.The measured partial pressure of nitric oxide is about 0. 33Pa which represents its concentration and the temperature is about 600K in the free-stream.关键词
可调谐二极管激光吸收光谱/浓度/温度/测量/激波风洞Key words
TDLAS/concentration/temperature/measurement/shock tunnel分类
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曾徽,余西龙,李飞,张少华..中红外吸收光谱测量激波风洞自由流中 NO 浓度和温度[J].实验流体力学,2015,(2):79-83,5.
