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Heat transfer characteristics of kerosene phase change based on fuel flow rates in the regenerative cooling heat exchanger of scramjet engines

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Abstract

In this study, we investigated the heat transfer characteristics of kerosene for various fuel flow rates in the regenerative cooling heat exchanger of scramjet engines. We used hydrogen for combustion and kerosene for the heat exchanger regenerative cooling. The internal combustor wall surface temperature was measured using a phosphor thermometer. The fuel pressure and temperature were also measured. Significant changes were observed when kerosene flow rate changed from 6 to 8 g/s. The fuel boiling point at specific pressures and temperatures was obtained using differential scanning calorimetry; at the kerosene boiling point, they were found to be consistent with the temperature and pressure values between 6 and 8 g/s fuel flows, which confirmed that the fuel changes from liquid to gas under these circumstances, leading to considerable changes in the surface and fuel temperature tendencies. These findings could help in the optimal design of scramjet engines regenerative cooling heat exchangers.

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Acknowledgments

This research was supported by the National Research Foundation of Korea (NRF) (Grant 2019K1A3A1A78077783 and 2020R1C1C1009976) and the Korea Research Institute of Standards and Science (Grant 20011027).

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Correspondence to Inyoung Yang.

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Seok Hwan Lee is a Senior Researcher of Division of Physical Metrology, Korea Research Institute of Standards and Science, Daejeon, Korea. He received his Ph.D. in School of Mechanical and Aerospace Engineering from Seoul National University. His research interests include micro flow measurement and thermo-fluid diagnostic methods using laser.

Inyoung Yang is a Principal Researcher of Aero-Propulsion Research Division, Korea Aerospace Research Institute, Daejeon, Korea. He received his Ph.D. in Department of Mechanical Engineering from KAIST. His research interests include scramjet engine.

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Lee, S.H., Lee, J., Kim, D. et al. Heat transfer characteristics of kerosene phase change based on fuel flow rates in the regenerative cooling heat exchanger of scramjet engines. J Mech Sci Technol 35, 2733–2741 (2021). https://doi.org/10.1007/s12206-021-0543-y

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