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Ketone dopant-induced dynamic quenching of liquid fuel fluorescence for two-phase flow visualization

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Abstract

Dynamic quenching of fuel fluorescence by ketone dopants in liquid phase is investigated to suggest an optical method for two-phase flow visualization in a liquid-fueled combustor. The fuel fluorescence is triggered by high peak-power 266 nm laser pulses. It is found that ketones can serve as quenchers absorbing the fluorescence of a widely used liquid fuel, exo-THDCPD (exo-tetrahydrodicyclopentadiene). The impact of the dynamic quenching on the fuel fluorescence is validated under various ambient temperature conditions to simulate two-phase fuel flows in preheated ambient air. The signal intensity ratio with and without the dopants (quenching ratio) is below 0.4 % near 290 nm when the ketone concentration in the mixture is 5 %, while the quenching effect is insignificant in the spectral range above 325 nm. As a result, the proposed technique is successfully demonstrated in a model supersonic combustor, delineating vapor-dominant regions in the two-phase supersonic flows.

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Acknowledgments

This work was supported by the Basic Research Funding of Korean Agency for Defense Development (grant number: UD210021JD, UD210034SD), the Korea Institute of Energy Technology Evaluation and Planning (grant number: 202067 10100030), and the National Research Foundation of Korea (NRF) grant funded by the Korea government (grant number: 2021R1A2C2012697, 2021R1A4A1032023).

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Authors and Affiliations

  1. Department of Mechanical Engineering, Seoul National University, Seoul, 08826, Korea

    Seongik Cha, Nam Young Kim & Hyungrok Do

  2. Aero-Propulsion Research Division, Korea Aerospace Research Institute (KARI), Daejeon, 34133, Korea

    Inyoung Yang & Sanghoon Lee

  3. Institute of Advanced Machines and Design (IAMD), Seoul National University, Seoul, 08826, Korea

    Hyungrok Do

Authors
  1. Seongik Cha
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  2. Nam Young Kim
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  4. Sanghoon Lee
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Correspondence to Hyungrok Do.

Additional information

Seongik Cha is currently a Ph.D. candidate in the Department of Mechanical Engineering at Seoul National University, Seoul, Korea. His research interests include laser diagnostics, supersonic combustion, and hypersonic flow.

Nam Young Kim is currently a Ph.D. candidate in the Department of Mechanical Engineering at Seoul National University, Seoul, Korea. His research interests include supersonic combustion and hypersonic flow.

Inyoung Yang received his Ph.D. degree in Department of Mechanical Engineering at KAIST. He is currently a Principal Researcher of Aero-Propulsion Research Division, Korea Aerospace Research Institute, Daejeon, Korea. His research interests include hypersonic air-breathing propulsion system.

Sanghoon Lee received his Ph.D. degree in 2016 from Hanyang University Seoul, Korea. He is currently a Senior Researcher in Aero-Propulsion Research Division at Korea Aerospace Research Institute (KARI) in Daejeon, Korea. His research interests include hypersonic flow, fuel spray atomization.

Hyungrok Do received his Ph.D. degree in 2009 from Stanford University, California, United States. He is currently a Professor in the Department of Mechanical Engineering at Seoul National University, Seoul, Korea. His research interests include laser diagnostics, hypersonic flow, and turbulent combustion.

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Cha, S., Kim, N.Y., Yang, I. et al. Ketone dopant-induced dynamic quenching of liquid fuel fluorescence for two-phase flow visualization. J Mech Sci Technol 37, 6559–6567 (2023). https://doi.org/10.1007/s12206-023-1127-9

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  • DOI: https://doi.org/10.1007/s12206-023-1127-9

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