| Citation: | LIU Qihang, WEN Jie, LÜ Lulu, et al. Experiment of compact finned-tube air-fuel heat exchanger[J]. Journal of Aerospace Power, 2023, 38（12）：2848-2860 doi: 10.13224/j.cnki.jasp.20220002
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In order to realize effective interaction between the internal thermal environment and heat sink of aeroengine, the flow and heat transfer characteristics of heat exchanger were studied. Taking the heat exchanger for fuel cooling as an example, the flow and heat transfer performance of small-diameter rectangular finned-tube air-fuel heat exchanger was studied. High temperature fuel and room-temperature air were used as media in the heat exchanger to explore the flow and heat transfer performance under different working conditions. And the empirical correlations for the outside of the tube were obtained. The results showed that the convective heat transfer coefficient of the rectangular finned tube bundles was about 44% of the bare tube bundle with the same structural parameters, while its flow resistance was still higher than the bare tube bundle. Therefore, the influence of fins on flow and heat transfer performance should be comprehensively considered in the design of finned tube heat exchanger. The fitting deviations of the empirical correlations of the Nusselt number and resistance coefficient outside the finned tube heat exchange unit were both lower than 5%, accurately reflecting the flow and heat transfer characteristics outside the finned tube bundles.
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