基于激光吸收光谱技术的超声速气流测量研究

推进技术 ›› 2014, Vol. 35 ›› Issue (6): 852-857.

基于激光吸收光谱技术的超声速气流测量研究

屈东胜,洪延姬,王广宇,潘虎

装备学院激光推进及其应用国家重点实验室，北京 101416;装备学院激光推进及其应用国家重点实验室，北京 101416;装备学院激光推进及其应用国家重点实验室，北京 101416;装备学院激光推进及其应用国家重点实验室，北京 101416

发布日期:2021-08-15
作者简介:屈东胜(1989—)，男，硕士生，研究领域为流场诊断技术方面。E-mail:hunqudongsheng@126.com

Measurements of Supersonic Gas Flow Based on Laser Absorption Spectroscopy

State Key Laboratory of Laser Propulsion and Application，Academy of Equipment，Beijing 101416，China;State Key Laboratory of Laser Propulsion and Application，Academy of Equipment，Beijing 101416，China;State Key Laboratory of Laser Propulsion and Application，Academy of Equipment，Beijing 101416，China;State Key Laboratory of Laser Propulsion and Application，Academy of Equipment，Beijing 101416，China

Published:2021-08-15

摘要/Abstract

摘要： 为研究可调谐半导体激光吸收光谱测量技术在工业环境中的应用，采用波长调制光谱测量方法，对超燃直连式试验台隔离段内的超声速气流进行了测量研究。通过对7185.60cm -1 和7454.45cm -1 2条H 2 O吸收谱线的频率标定和多普勒频移测量，实现了高速气流速度的实时在线测量，测量值相对于预测值的偏差在3%以内。基于2条H 2 O吸收谱线的光谱参数和激光调制参数，建立了基于实验环境的仿真数据库。采用频分复用方法，通过迭代求解了隔离段内的温度和组分浓度，其结果相对于预测值的偏差分别在4%和12%以内。该方法不仅能够实现不同谱线的同步实时测量，而且验证了在恶劣环境下的应用效果。

关键词: 波长调制光谱；速度测量；温度测量；组分浓度测量；频分复用

Abstract: In order to study the application of tunable diode laser absorption spectroscopy technology in the industrial environment，the supersonic gas flow in the isolator of direct-connected scramjet test facility can be studied via wavelength modulation spectroscopy technology. The real-time and on-line measurement of velocity in the high-speed gas flows can be realized after calibrating the frequency and calculating the Doppler shift of two H 2 O absorption transitions(7185.60cm -1 and 7454.45cm -1 ). The most relative error is 3% compared with the predicted value. The simulation database can be created based on the spectroscopic parameters and laser modulation parameters of two H 2 O absorption transitions. Frequency division multiplexing technology is adopted to measure gas temperature and concentration in the isolator. Compared with the predicted value，the results have a good agreement and the most relative errors are 4% and 12% respectively，which proves that the method is reasonable and reliable in the engineering application. It not only can achieve the real-time measurement at the same time，but also validates the application effects in the harsh environment.

Key words: Wavelength modulation spectroscopy；Velocity measurement；Temperature measurement；Concentration measurement；Frequency division multiplexing

屈东胜,洪延姬,王广宇,潘虎. 基于激光吸收光谱技术的超声速气流测量研究[J]. 推进技术, 2014, 35(6): 852-857.

QU Dong-sheng,HONG Yan-ji,WANG Guang-yu,PAN Hu. Measurements of Supersonic Gas Flow Based on Laser Absorption Spectroscopy[J]. Journal of Propulsion Technology, 2014, 35(6): 852-857.

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