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Numerical Investigation of the Effect of Hub Gaps on the 3D Flows Inside the Stator of a Highly Loaded Axial Compressor Stage

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
    Advanced Jet Propulsion Innovation Center/AEAC, Beijing 101304, China)

  • Zhu Fan

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

  • Ying Qiu

    (Research Institute of Aero-Engine, Beihang University, Beijing 102206, China
    China United Gas Turbine Technology Co., Ltd., Beijing 100029, China)

  • Ruoyu Wang

    (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)

  • 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)

Abstract

Both the compressor performance and the 3D flows inside the stator passage are significantly impacted by the stator hub gap. The interplay between leakage flow and corner separation within a cantilevered stator of a highly loaded, low-speed axial compressor with a succession of stator hub gaps was examined numerically in this paper. Firstly, the simulated results were compared with the measured results, including the compressor characteristics, the 3D flow structures, and the flow fields at the stator outlet. The results revealed that the used CFD solver, as well as the corresponding setup, can reproduce the flow not only in terms of the trend along with the stator hub gap, but also in terms of the specific scale of the 3D flow structure. Hence, it is feasible enough to be applied in the present investigation. Secondly, the flow mechanisms of the interplay between the corner separation and the leakage flow with different stator hub gaps were analyzed. It was found that the velocity of the leakage flow is the key parameter that dominates the flow structures as well as the compressor performance. Additionally, a simple metric was proposed to be used to choose the optimum stator hub gap. By comparing our results with those from published research, this metric was proven to be feasible. Finally, it is also discussed how the stator hub gap affected the stator inlet flow and rotor performance. It is demonstrated that the stator passage flow blockage can affect the upstream flow field. As a result, the performance of the rotor tends to vary in the opposite direction to that of the stator.

Suggested Citation

  • Guangfeng An & Zhu Fan & Ying Qiu & Ruoyu Wang & Xianjun Yu & Baojie Liu, 2022. "Numerical Investigation of the Effect of Hub Gaps on the 3D Flows Inside the Stator of a Highly Loaded Axial Compressor Stage," Energies, MDPI, vol. 15(19), pages 1-20, September.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:19:p:6993-:d:923382
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    Cited by:

    1. Xing Li & Ning Huang & Guanyan Chen & Yanli Zhang & Yang Zhao & Jie Zhang & Ding Tong, 2023. "Numerical Simulation on the Influence of Inlet Flow Characteristics on the Performance of a Centrifugal Compressor," Energies, MDPI, vol. 16(9), pages 1-24, May.

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