| Citation: | WANG Y H，LU Y N，LI H W，et al. Numerical study on heat transfer of supercritical RP-3 aviation kerosene in vertical helical tubes[J]. Journal of Beijing University of Aeronautics and Astronautics，2023，49（5）：1108-1115 （in Chinese） doi: 10.13700/j.bh.1001-5965.2021.0421
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To understand the cooling heat transfer problem in air-kerosene heat exchangers, numerical study on the heat transfer of supercritical RP-3 aviation kerosene in vertical helical tubes has been conducted. The heat transfer characteristics and mechanisms under different operating parameters and structural parameters were investigated, including the average heat transfer along the flow direction, and the local heat transfer along the circumferential direction. The temperature and secondary flow distributions in tube cross-sections were discussed. The effect mechanism of centrifugal force on heat transfer was analyzed through radial differences of velocity and turbulent kinetic energy. Based on the error analysis, an effective heat transfer correlation was obtained. The results show that the enhanced heat transfer appears in the downstream section, and the local deteriorated heat transfer is observed at low-pressure condition. The centrifugal force results in the abnormal lateral stratification of temperature in the fluid domain, the uneven thickness of boundary layer in the circumferential direction, and the secondary flow in tube cross-sections. The outer position has the large fluid velocity and turbulent kinetic energy. Hence, the heat transfer of the outer position. is significantly better than that the inner position. Increases the pressure, decreases the heat-mass radio, increases the helical diameter, and increases the pitch could suppress the effect of centrifugal force, leading to the weakened secondary flow intensity. The Merkel heat transfer formula can better realize the heat transfer prediction of aviation kerosene in vertical helical tubes.
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