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

Author

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  • 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
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    References listed on IDEAS

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    1. 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.
    2. 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.
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    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.

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