Abstract
Since planar laser-induced fluorescence (PLIF) temperature measurements in a combustion-flow field can only be performed in regions in which OH is abundant (i.e., the reaction and high-temperature burnout zones), this paper investigates the feasibility of using photolysis of dissolved water to generate additional OH in the low-temperature and non-reaction zones of the flow field. Multi-line fluorescence showed that the generated OH had reached thermal equilibrium within 50 ns after dissociation with a fitting temperature of 300 K in room-temperature air. To further verify the technical accuracy, averaged PLIF images from dissociated OH were calibrated and compared with thermocouple measurements in a heated-flow field, and the average deviation in the 423–823 K temperature range was less than 40 K, with a relative system error better than 5%. The results of this paper confirm the feasibility and accuracy of the photo-fragment PLIF (PF-PLIF) temperature measurement in a low-temperature flow field. This makes it an effective complement to traditional PLIF measurements, with great significance for analysis and model validation of combustion processes in low temperature.
Graphic abstract
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Acknowledgments
This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 91641112, 91841303, 91752107, and 51888103). The authors would like to thank the Foundation of State Key Laboratory of Laser Interaction with Matter (Grant No. SKLLIM1808). All authors contributed equally to this work. The author would like to thank Enago (www.enago.cn) for providing English polish services. The data that support the findings of this study are available within this article. More detailed data, such as those forming the color plots in the article, are available from the corresponding author upon reasonable request.
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Li, G., Zhang, Z., Ye, J. et al. Planar laser-induced fluorescence thermometry in moderate-temperature flow using OH from photo-dissociation of water vapor. Exp Fluids 62, 55 (2021). https://doi.org/10.1007/s00348-021-03165-z
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DOI: https://doi.org/10.1007/s00348-021-03165-z