Acta Optica Sinica, Volume. 40, Issue 3, 0330001(2020)
Measurement of Gas Parameters in Supersonic Combustion Field Based on Near-Infrared Spectroscopy
In this paper, a method of measuring gas temperature, velocity, and mole fraction of H2O in a high-speed field based on near-infrared absorption spectra of H2O is proposed. The method is applied to a supersonic combustion field and some phenomena and laws in the combustion field are analyzed. The experiment is performed in a scramjet isolation section and extended section based on wavelength modulation spectroscopy using two H2O absorption spectral lines, and synchronous measurements of multiple parameters are realized. After performing the ignition test under combustion, the measured velocity, temperature, pressure, and mole fraction of H2O are consistent with the predicted values when there is no shock wave in the isolation section, and the relative errors are less than 3.0%, 7.2%, 8.2%, and 3.9%, respectively. If the isolation section has a shock wave, the gas velocity, temperature, pressure, and mole fraction of H2O have considerable differences. Additionally, information about the air mass flux has a small difference, but the fluctuation considerably increases. The experimental results show that the sensor based on wavelength modulation spectroscopy has great engineering value.
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Dongsheng Qu, Hongjie Fan, Lianwei Liu, Jie Chen, Qianjin Zou. Measurement of Gas Parameters in Supersonic Combustion Field Based on Near-Infrared Spectroscopy[J]. Acta Optica Sinica, 2020, 40(3): 0330001
Category: Spectroscopy
Received: Aug. 19, 2019
Accepted: Sep. 29, 2019
Published Online: Feb. 10, 2020
The Author Email: Qu Dongsheng (hnqudongsheng@126.com)