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Numerical Investigation on Mechanism of Swirling Flow of the Prefilming Air-Blast Fuel Injector

Author

Listed:
  • Cheng Cao

    (Laboratory of Light-Duty Gas-Turbine, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
    School of Aeronautics and Astronautics, University of Chinese Academy of Sciences, Beijing 100049, China)

  • Yaping Gao

    (Laboratory of Light-Duty Gas-Turbine, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
    School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang 212013, China)

  • Shaolin Wang

    (Laboratory of Light-Duty Gas-Turbine, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
    School of Aeronautics and Astronautics, University of Chinese Academy of Sciences, Beijing 100049, China)

  • Fuqiang Liu

    (Laboratory of Light-Duty Gas-Turbine, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
    School of Aeronautics and Astronautics, University of Chinese Academy of Sciences, Beijing 100049, China)

  • Cunxi Liu

    (Laboratory of Light-Duty Gas-Turbine, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
    School of Aeronautics and Astronautics, University of Chinese Academy of Sciences, Beijing 100049, China)

  • Yong Mu

    (Laboratory of Light-Duty Gas-Turbine, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
    School of Aeronautics and Astronautics, University of Chinese Academy of Sciences, Beijing 100049, China)

  • Deqing Mei

    (School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang 212013, China)

  • Gang Xu

    (Laboratory of Light-Duty Gas-Turbine, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
    School of Aeronautics and Astronautics, University of Chinese Academy of Sciences, Beijing 100049, China)

Abstract

Prefilming air-blast atomizers are widely used in modern gas turbine combustors. Due to insufficient awareness of the coupling mechanism of multi-stage swirling flow in gas turbines, there is a lack of effective methods for flow field optimization in combustor. In this study, the effect of some critical parameters on the flow field of a prefilming air-blast atomizer was analyzed with CFD. The parameters include the angle and number of the first swirler blades, the angle of the second swirler blades and the angle of sleeve. Furthermore, the coupling mechanism of two-stage swirling airflows of prefilming air-blast atomizer was discussed. Moreover, the influence of the interaction between two-stage counter swirling airflows on the characteristics of flow field was explained. The results show that with the increase in SN i , the axial length of the primary recirculation zone decreased, while the radial width increased. The starting position of primary recirculation zone (PRZ) moves forward with the increase in SN o . Reducing the sleeve angle β helps to form the primary recirculation zone. The results indicate that it is the transition of tangential velocity of airflow to radial velocity that promotes the formation of the PRZ. These results provide theoretical support for optimization of the flow field in swirl combustor.

Suggested Citation

  • Cheng Cao & Yaping Gao & Shaolin Wang & Fuqiang Liu & Cunxi Liu & Yong Mu & Deqing Mei & Gang Xu, 2023. "Numerical Investigation on Mechanism of Swirling Flow of the Prefilming Air-Blast Fuel Injector," Energies, MDPI, vol. 16(2), pages 1-18, January.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:2:p:650-:d:1026123
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