Ms. Junling Song Profile

Junling Song

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Proceedings Article | 22 December 2022 Paper

On-line measurement of kerosene pyrolysis gas based on TDLAS technology

Jianyu Guo, Wei Rao, Junling Song

Proceedings Volume 12459, 1245911 (2022) https://doi.org/10.1117/12.2656335

KEYWORDS: Methane, Absorption, Absorbance, Molecules, Calibration, Temperature metrology, Signal processing, Nitrogen, Databases, Semiconductor lasers

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Accurate measurement of the kerosene pyrolysis content is of great significance to study the supersonic combustion and active cooling of supersonic engine scramjet. Methane (CH₄) and ethylene (C₂H₄) are two main gas products of the kerosene pyrolysis. In this paper, TDLAS technology is used to study the synchronous measurement methods of these two gas products in near infrared region. A kerosene pyrolysis gas simulation system was constructed with pure CH₄, C₂H₄, nitrogen (N₂) cylinders and gas mass flowmeters. A set of measurement system was built by distributed feedback laser (DFB) and Herriott gas cell with an optical path of 10.5m. The absorption spectrums are selected as 1.653μm for CH₄ and 1.626μm for C₂H₄. Five groups of mixed gas with different CH₄ and C₂H₄ concentrations between 0.5% to 3% was measured in the Herriott gas cell. The experimental results show that all the relative errors of the measured CH₄ and C₂H₄ concentrations are within 3.3%, which illustrated the measurement equipment and method used in this paper have high accuracy and reliability. This study provides effective experience for further on-line measurement of kerosene pyrolysis gas using off-axis integral cavity output spectroscopy (OA-ICOS).

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