Volume 40 Issue 4
Apr.  2025
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LI Cairui, YOU Ruquan, CHE Junxin, et al. Flow resistance and heat transfer characteristics of U-shaped channel with top outflow in rotating state[J]. Journal of Aerospace Power, 2025, 40（4）：20240520 doi: 10.13224/j.cnki.jasp.20240520
Citation: LI Cairui, YOU Ruquan, CHE Junxin, et al. Flow resistance and heat transfer characteristics of U-shaped channel with top outflow in rotating state[J]. Journal of Aerospace Power, 2025, 40（4）：20240520 doi: 10.13224/j.cnki.jasp.20240520
shu

Flow resistance and heat transfer characteristics of U-shaped channel with top outflow in rotating state

doi: 10.13224/j.cnki.jasp.20240520
  • 1.

    Research Institute of Aero-Engine，Beihang University，Beijing 100191，China

  • 2.

    China Academy of Aerospace Aerodynamics，Beijing 100074，China

  • 3.

    Hunan Key Laboratory of Turbomachinery on Small and Medium Aero-Engine，Hunan Aviation Powerplant Research Institute，Aero Engine Corporation of China，Zhuzhou Hunan 412002，China

  • Received Date: 2024-07-29
    Available Online: 2024-12-11
    Abstract

  • The influence of the outflow from the top of the U-shaped channel on the heat transfer and flow resistance characteristics of the turning section wall under the rotating state was studied. The distributions of Fanning friction factor and Nusselt number of U-shaped channel under the influences of different outflow ratios with Reynolds number within the range of 10000 to 50000 and rotation number within the range of 0 to 0.5 were obtained. The results showed that the top outlet position had little effect on heat transfer, with a change of less than 3%, but the effect on flow resistance can reach 37%. Specifically, the top outflow model on the inlet side of the turning section exhibited the lowest flow resistance, with a thermal performance coefficient 14% higher than other top outflow positions. In conclusion, the position of the dust removal hole significantly affected the flow state of the fluid in the turning section. While it had a significant influence on flow resistance, its effect on heat transfer was minimal. To achieve a structure with higher thermal performance, it is recommended to select the dust removal hole position at the top of the inlet side of the turning section.

     

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