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Interpretation of Four Unique Phenomena and the Mechanism in Unsteady Flow Separation Controls

Author

Listed:
  • Weiyu Lu

    (College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China)

  • Guoping Huang

    (College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China)

  • Jinchun Wang

    (College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China)

  • Yuxuan Yang

    (College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China)

Abstract

Unsteady flow separation controls are effective in suppressing flow separations. However, the unique phenomena in unsteady separation control, including frequency-dependent, threshold, location-dependent, and lock-on effects, are not fully understood. Furthermore, the mechanism of the effectiveness that lies in unsteady flow controls remains unclear. Thus, this study aims to interpret further the unique phenomena and mechanism in unsteady flow separation controls. First, numerical simulation and some experimental results of a separated curved diffuser using pulsed jet flow control are discussed to show the four unique phenomena. Second, the bases of unsteady flow control, flow instability, and free shear flow theories are introduced to elucidate the unique phenomena and mechanism in unsteady flow separation controls. Subsequently, with the support of these theories, the unique phenomena of unsteady flow control are interpreted, and the mechanisms hidden in the phenomena are revealed.

Suggested Citation

  • Weiyu Lu & Guoping Huang & Jinchun Wang & Yuxuan Yang, 2019. "Interpretation of Four Unique Phenomena and the Mechanism in Unsteady Flow Separation Controls," Energies, MDPI, vol. 12(4), pages 1-18, February.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:4:p:587-:d:205406
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    References listed on IDEAS

    as
    1. Jie Chen & Weiyu Lu & Guoping Huang & Jianfeng Zhu & Jinchun Wang, 2017. "Research on Pulsed Jet Flow Control without External Energy in a Blade Cascade," Energies, MDPI, vol. 10(12), pages 1-18, December.
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    Cited by:

    1. Zheng Hui & Xingjun Hu & Peng Guo & Zewei Wang & Jingyu Wang, 2019. "Separation Flow Control of a Generic Ground Vehicle Using an SDBD Plasma Actuator," Energies, MDPI, vol. 12(20), pages 1-14, October.

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