IDEAS home Printed from https://ideas.repec.org/a/gam/jeners/v17y2024i14p3387-d1432504.html
   My bibliography  Save this article

The Evolution of Flow Structures and Coolant Coverage in Double-Row Film Cooling with Upstream Forward Jets and Downstream Backward Jets

Author

Listed:
  • Yanqin Shangguan

    (College of Mechanical and Electrical Engineering, Hohai University, Nanjing 210098, China)

  • Fei Cao

    (College of Mechanical and Electrical Engineering, Hohai University, Nanjing 210098, China)

Abstract

The spatiotemporal evolution of the flow structures and coolant coverage of double-row film cooling with upstream forward jets and downstream backward jets, having a significant impact on film-cooling performance, is studied using the simplified thermal lattice Boltzmann method (STLBM). Moreover, the effect of the inclination angle of downstream backward jets is considered. The high-performance simulations of film cooling have been conducted by using our verified in-house solver. Results show that special flow structures, such as a sand dune-shaped protrusion, appear in double-row film cooling with upstream forward jets and downstream backward jets, which is mainly because of the blockage effect resulting from the coolant jet with backward injection. The interaction among structures results in the generation of an anti-counterrotating vortex pair (anti-CVP). The anti-CVP with the downwash motion can result in the attachment of coolant to the bottom wall, which promotes the stability and lateral coverage of coolant film. The momentum and heat transport are strengthened as the backward jet is injected into the boundary layer of the mainstream. Although the downstream evolution of the backward jet is not very smooth, its core attaches closely to the bottom wall due to the downwash motion of anti-CVP. Moreover, there is an obvious backflow zone shown in the trailing edge of the downstream backward jet with a large inclination angle. The obvious backflow makes the coolant attach to the bottom wall well. Therefore, the film cooling effectiveness is improved as the inclination angle of the downstream backward jet varies from α d o w n = 135 ° to α d o w n = 155 ° , with a constant blowing ratio of B R = 0.5 . In addition, the fluctuation of the bottom wall’s temperature is weak due to the stable coverage of the coolant layer under α d o w n = 155 ° . The film-cooling performance with an inclination angle of α d o w n = 155 ° is the best among all the cases studied in this work. This work provides essential insights into film cooling with backward coolant injection and contributes to obtaining a complete understanding of film cooling with backward coolant injection.

Suggested Citation

  • Yanqin Shangguan & Fei Cao, 2024. "The Evolution of Flow Structures and Coolant Coverage in Double-Row Film Cooling with Upstream Forward Jets and Downstream Backward Jets," Energies, MDPI, vol. 17(14), pages 1-22, July.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:14:p:3387-:d:1432504
    as

    Download full text from publisher

    File URL: https://www.mdpi.com/1996-1073/17/14/3387/pdf
    Download Restriction: no
    File URL: https://www.mdpi.com/1996-1073/17/14/3387/
    Download Restriction: no
    ---><---

    References listed on IDEAS

    as
    1. Yanqin Shangguan & Fei Cao, 2022. "An LBM-Based Investigation on the Mixing Mechanism of Double Rows Film Cooling with the Combination of Forward and Backward Jets," Energies, MDPI, vol. 15(13), pages 1-19, July.
    2. Xian Wang & Yanqin Shangguan & Naoyuki Onodera & Hiromichi Kobayashi & Takayuki Aoki, 2014. "Direct Numerical Simulation and Large Eddy Simulation on a Turbulent Wall-Bounded Flow Using Lattice Boltzmann Method and Multiple GPUs," Mathematical Problems in Engineering, Hindawi, vol. 2014, pages 1-10, April.
    Full references (including those not matched with items on IDEAS)

    Most related items

    These are the items that most often cite the same works as this one and are cited by the same works as this one.
    1. Yanqin Shangguan & Fei Cao, 2022. "An LBM-Based Investigation on the Mixing Mechanism of Double Rows Film Cooling with the Combination of Forward and Backward Jets," Energies, MDPI, vol. 15(13), pages 1-19, July.
    2. Fei Cao & Yan Yang, 2023. "Recent Advances in Residential Energy Utilization Technologies for Low-Carbon Emissions in China," Energies, MDPI, vol. 16(13), pages 1-3, July.

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:gam:jeners:v:17:y:2024:i:14:p:3387-:d:1432504. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    If CitEc recognized a bibliographic reference but did not link an item in RePEc to it, you can help with this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: MDPI Indexing Manager (email available below). General contact details of provider: https://www.mdpi.com .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.