IDEAS home Printed from https://ideas.repec.org/a/gam/jeners/v14y2021i8p2063-d532394.html
   My bibliography  Save this article

Large Eddy Simulation of Film Cooling with Forward Expansion Hole: Comparative Study with LES and RANS Simulations

Author

Listed:
  • Seung Il Baek

    (Department of Mechanical Engineering, Chung-Ang University, 84, Heukseok-ro, Dongjak-gu, Seoul 06974, Korea)

  • Jaiyoung Ryu

    (Department of Mechanical Engineering, Chung-Ang University, 84, Heukseok-ro, Dongjak-gu, Seoul 06974, Korea
    Department of Intelligent Energy and Industry, Chung-Ang University, 84, Heukseok-ro, Dongjak-gu, Seoul 06974, Korea)

  • Joon Ahn

    (School of Mechanical Engineering, Kookmin University, 77 Jeongneung-ro, Seongbuk-gu, Seoul 02707, Korea)

Abstract

The forward expansion hole improves the film cooling effectiveness by reducing the penetration of the coolant jet into the main flow compared to the cylindrical holes. In addition, compound angles improve the film cooling effectiveness by promoting the lateral spreading of the coolant on a wall. Evidently, the combination of a compound angle and shaped hole further improves the adiabatic film cooling effectiveness. The film cooling flow with a shaped hole with 15° forward expansion, a 35° inclination angle, and 0° and 30° compound angles at 0.5 and 1.0 blowing ratios was numerically simulated with Large Eddy Simulations (LES) and Reynolds-averaged Navier–Stokes (RANS) simulations. The results of the time-averaged film cooling effectiveness, temperature, velocity, and root-mean-square (rms) values of the fluctuating velocity and temperature profiles were compared with the experimental data by Lee et al. (2002) to verify how the LES improves the results compared to those of the RANS. For the forward expansion hole, the velocity and temperature fluctuations in the LES contours are smaller than those of the cylindrical hole; thus, the turbulence and mixing intensity of the forward expansion hole are weaker and lower than those of the cylindrical hole, respectively. This leads to the higher film cooling effectiveness of the forward expansion hole. By contrast, the RANS contours do not exhibit velocity or temperature fluctuations well. These results are discussed in detail in this paper.

Suggested Citation

  • Seung Il Baek & Jaiyoung Ryu & Joon Ahn, 2021. "Large Eddy Simulation of Film Cooling with Forward Expansion Hole: Comparative Study with LES and RANS Simulations," Energies, MDPI, vol. 14(8), pages 1-19, April.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:8:p:2063-:d:532394
    as

    Download full text from publisher

    File URL: https://www.mdpi.com/1996-1073/14/8/2063/pdf
    Download Restriction: no
    File URL: https://www.mdpi.com/1996-1073/14/8/2063/
    Download Restriction: no
    ---><---

    References listed on IDEAS

    as
    1. Myung Gon Choi & Jaiyoung Ryu, 2018. "Numerical Study of the Axial Gap and Hot Streak Effects on Thermal and Flow Characteristics in Two-Stage High Pressure Gas Turbine," Energies, MDPI, vol. 11(10), pages 1-15, October.
    2. Jae-Sung Oh & Taehak Kang & Seokgyun Ham & Kwan-Sup Lee & Yong-Jun Jang & Hong-Sun Ryou & Jaiyoung Ryu, 2019. "Numerical Analysis of Aerodynamic Characteristics of Hyperloop System," Energies, MDPI, vol. 12(3), pages 1-17, February.
    Full references (including those not matched with items on IDEAS)

    Citations

    Citations are extracted by the CitEc Project, subscribe to its RSS feed for this item.
    as


    Cited by:

    1. Seung-Il Baek & Joon Ahn, 2021. "Large Eddy Simulation of Film Cooling Involving Compound Angle Hole with Bulk Flow Pulsation," Energies, MDPI, vol. 14(22), pages 1-18, November.
    2. Seung-Il Baek & Joon Ahn, 2022. "Effects of Bulk Flow Pulsation on Film Cooling Involving Compound Angle," Energies, MDPI, vol. 15(7), pages 1-19, April.
    3. 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.
    4. Joon Ahn, 2022. "Large Eddy Simulation of Film Cooling: A Review," Energies, MDPI, vol. 15(23), pages 1-21, November.
    5. Shengchang Zhang & Chunhua Wang & Xiaoming Tan & Jingzhou Zhang & Jiachen Guo, 2022. "Numerical Investigation on Backward-Injection Film Cooling with Upstream Ramps," Energies, MDPI, vol. 15(12), pages 1-20, June.

    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. Thanh Dam Mai & Jaiyoung Ryu, 2021. "Effects of Damaged Rotor Blades on the Aerodynamic Behavior and Heat-Transfer Characteristics of High-Pressure Gas Turbines," Mathematics, MDPI, vol. 9(6), pages 1-21, March.
    2. Thi Thanh Giang Le & Kyeong Sik Jang & Kwan-Sup Lee & Jaiyoung Ryu, 2020. "Numerical Investigation of Aerodynamic Drag and Pressure Waves in Hyperloop Systems," Mathematics, MDPI, vol. 8(11), pages 1-23, November.
    3. Jerzy Kisilowski & Rafał Kowalik, 2020. "Displacements of the Levitation Systems in the Vehicle Hyperloop," Energies, MDPI, vol. 13(24), pages 1-25, December.
    4. Thanh Dam Mai & Jaiyoung Ryu, 2020. "Effects of Leading-Edge Modification in Damaged Rotor Blades on Aerodynamic Characteristics of High-Pressure Gas Turbine," Mathematics, MDPI, vol. 8(12), pages 1-21, December.
    5. Mohammed Abdulla & Khalid A. Juhany, 2022. "A Rapid Solver for the Prediction of Flow-Field of High-Speed Vehicle Moving in a Tube," Energies, MDPI, vol. 15(16), pages 1-15, August.
    6. Jae-Sung Oh & Taehak Kang & Seokgyun Ham & Kwan-Sup Lee & Yong-Jun Jang & Hong-Sun Ryou & Jaiyoung Ryu, 2019. "Numerical Analysis of Aerodynamic Characteristics of Hyperloop System," Energies, MDPI, vol. 12(3), pages 1-17, February.
    7. Lambros Mitropoulos & Annie Kortsari & Alexandros Koliatos & Georgia Ayfantopoulou, 2021. "The Hyperloop System and Stakeholders: A Review and Future Directions," Sustainability, MDPI, vol. 13(15), pages 1-28, July.
    8. Jungyoul Lim & Chang-Young Lee & Jin-Ho Lee & Wonhee You & Kwan-Sup Lee & Suyong Choi, 2020. "Design Model of Null-Flux Coil Electrodynamic Suspension for the Hyperloop," Energies, MDPI, vol. 13(19), pages 1-21, September.
    9. Eric Chaidez & Shankar P. Bhattacharyya & Adonios N. Karpetis, 2019. "Levitation Methods for Use in the Hyperloop High-Speed Transportation System," Energies, MDPI, vol. 12(21), pages 1-18, November.
    10. Olena Stryhunivska & Katarzyna Gdowska & Rafał Rumin, 2020. "A Concept of Integration of a Vactrain Underground Station with the Solidarity Transport Hub Poland," Energies, MDPI, vol. 13(21), pages 1-23, November.
    11. Jinho Lee & Wonhee You & Jungyoul Lim & Kwan-Sup Lee & Jae-Yong Lim, 2021. "Development of the Reduced-Scale Vehicle Model for the Dynamic Characteristic Analysis of the Hyperloop," Energies, MDPI, vol. 14(13), pages 1-13, June.
    12. Sui, Yang & Niu, Jiqiang & Yu, Qiujun & Yuan, Yanping & Cao, Xiaoling & Yang, Xiaofeng, 2021. "Numerical analysis of the aerothermodynamic behavior of a Hyperloop in choked flow," Energy, Elsevier, vol. 237(C).
    13. Zhiwei Zhou & Chao Xia & Xizhuang Shan & Zhigang Yang, 2022. "Numerical Study on the Aerodynamics of the Evacuated Tube Transportation System from Subsonic to Supersonic," Energies, MDPI, vol. 15(9), pages 1-19, April.
    14. Janusz Piechna, 2021. "Low Pressure Tube Transport—An Alternative to Ground Road Transport—Aerodynamic and Other Problems and Possible Solutions," Energies, MDPI, vol. 14(13), pages 1-33, June.
    15. Aditya Bose & Vimal K. Viswanathan, 2021. "Mitigating the Piston Effect in High-Speed Hyperloop Transportation: A Study on the Use of Aerofoils," Energies, MDPI, vol. 14(2), pages 1-18, January.

    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:14:y:2021:i:8:p:2063-:d:532394. 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.