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Analysis of the Flow Capacity of Variable Cycle Split Fans at the Middle Speed

Author

Listed:
  • Guangfeng An

    (Research Institute of Aero-Engine, Beihang University, Beijing 102206, China
    National Key Laboratory of Science and Technology on Aero-Engine Aero-Thermodynamics, Beihang University, Beijing 102206, China
    Frontiers Science Center for Super-Cycle Aeroengine’s Aerothermodynamics, Beihang University, Beijing 102206, China)

  • Rui Zhou

    (Research Institute of Aero-Engine, Beihang University, Beijing 102206, China)

  • Xianjun Yu

    (Research Institute of Aero-Engine, Beihang University, Beijing 102206, China
    National Key Laboratory of Science and Technology on Aero-Engine Aero-Thermodynamics, Beihang University, Beijing 102206, China
    Frontiers Science Center for Super-Cycle Aeroengine’s Aerothermodynamics, Beihang University, Beijing 102206, China)

  • Baojie Liu

    (Research Institute of Aero-Engine, Beihang University, Beijing 102206, China
    National Key Laboratory of Science and Technology on Aero-Engine Aero-Thermodynamics, Beihang University, Beijing 102206, China
    Frontiers Science Center for Super-Cycle Aeroengine’s Aerothermodynamics, Beihang University, Beijing 102206, China)

  • Guanghan Wu

    (Research Institute of Aero-Engine, Beihang University, Beijing 102206, China
    Shenyang Engine Research Institute, Aero Engine Corporation of China, Shenyang 110015, China)

Abstract

The next-generation variable cycle engine imposes stricter requirements on a fan’s flow capacity at the middle speed. To tackle this challenge, the implementation of split fans presents as a potential solution. In the present study, we conducted numerical simulations using the commercial software NUMECA to investigate the aerodynamic performance variation with bypass ratios for variable cycle split fans in “1 + 2” and “2 + 1” configurations at 80% rpm. The results indicate that the flow capacity of the split fans exhibits an increasing trend with a rise in the bypass ratio at 80% rpm and subsequently stabilizes upon reaching a certain bypass ratio. Specifically, the flow capacity of the “2 + 1” split fans is particularly stronger at the small bypass ratios, whereas the “1 + 2” split fans exhibit superior maximum flow capacity at the high bypass ratios. Additionally, there is a significantly faster increase in the flow capacity of the “1 + 2” split fans compared to that of the “2 + 1” split fans. Furthermore, when the flow capacity of the split fans reaches its maximum, both the efficiency and stall margin achieve their optimal values, indicating that the corresponding bypass ratio is optimal.

Suggested Citation

  • Guangfeng An & Rui Zhou & Xianjun Yu & Baojie Liu & Guanghan Wu, 2024. "Analysis of the Flow Capacity of Variable Cycle Split Fans at the Middle Speed," Energies, MDPI, vol. 17(5), pages 1-18, March.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:5:p:1194-:d:1350037
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