Simultaneous quantitative imaging of temperature and H2O/CH2O concentration by using LAS fused Nd-YAG laser-induced fluorescence
IEEE Transactions on Instrumentation and Measurement（2024）
摘要
A planar laser induced fluorescence (PLIF) using the third harmonic of the Nd-YAG laser at 355 nm is employed to visualize temperature and H
2
O/CH
2
O concentration distributions inside flames. Laser Absorption Spectroscopy (LAS) is employed for initial images of temperature and H
2
O concentration, and the measured absorption offers constraints to update temperature and H
2
O concentration images. A chemical reaction kinetics model based on ethanol combustion mechanisms is established, offering the production rate of H
2
O and CH
2
O, thereby bridging PLIF and LAS. The images of temperature and CH
2
O/H
2
O concentration is produced iteratively for quantitative imaging of the flame cross-section. A flame fueled with ethanol vapor was used and images of temperature, H
2
O concentration and CH
2
O concentration were given. Comparisons with thermocouples, the temperature difference was found to be no more than 40 K. The images of H
2
O and CH
2
O concentrations detailed the area of incomplete combustion within the flame and its temporal variations. Relative deviations from experiment results to the ideal values are respectively 3.05 % and 5.34 % for H
2
O and CH
2
O.
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关键词
Temperature,H2O concentration,CH2O concentration,Laser absorption spectroscopy,Planar laser induced fluorescence
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