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Influence of Dimple Diameter and Depth on Heat Transfer of Impingement-Cooled Turbine Leading Edge with Cross-Flow and Dimple

Author

Listed:
  • Bin Qu

    (AECC Hunan Aviation Powerplant Research Institute, Zhuzhou 412000, China
    Hunan Key Laboratory of Turbomachinery on Medium and Small Aero-Engine, Zhuzhou 412000, China)

  • Zilong Chen

    (School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150000, China)

  • Dengke He

    (School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150000, China)

  • Fei Zeng

    (AECC Hunan Aviation Powerplant Research Institute, Zhuzhou 412000, China
    Hunan Key Laboratory of Turbomachinery on Medium and Small Aero-Engine, Zhuzhou 412000, China)

  • Youfu Song

    (AECC Hunan Aviation Powerplant Research Institute, Zhuzhou 412000, China
    Hunan Key Laboratory of Turbomachinery on Medium and Small Aero-Engine, Zhuzhou 412000, China)

  • Yuqing Ouyang

    (AECC Hunan Aviation Powerplant Research Institute, Zhuzhou 412000, China
    Hunan Key Laboratory of Turbomachinery on Medium and Small Aero-Engine, Zhuzhou 412000, China)

  • Lei Luo

    (School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150000, China)

Abstract

Today, impingement cooling structures with dimples can effectively ease the burden of turbine blades. This paper investigates the effect of dimple diameter and depth on the heat transfer of the target surface on a laminar-cooled turbine blade with a cross-flow and dimple numerically to find the mechanism behind it so that the dimple can be better used in turbine cooling. The commercial software ANSYS 19.2 and a baseline (BSL) turbulence model is used during the numerical computation. In this paper, the cross-flow Reynolds number varies from 15,000 to 60,000, while the jet Reynolds number remains at 30,000. When the cross-flow Reynolds number changes, due to the location change in vortexes generated inside or around the dimple, the two dimple parameters affect heat transfer differently. When the cross-flow Reynolds number is lower than the jet Reynolds number, dimples with smaller diameters and depths lead to better heat transfer performance. When the cross-flow Reynolds number exceeds the jet Reynolds number, dimples with bigger diameters and depths result in better heat exchange performance. The results also indicate that, while the dimple diameters remain constant, the rise of the cross-flow Reynolds number enhances the heat transfer of the dimple structure.

Suggested Citation

  • Bin Qu & Zilong Chen & Dengke He & Fei Zeng & Youfu Song & Yuqing Ouyang & Lei Luo, 2023. "Influence of Dimple Diameter and Depth on Heat Transfer of Impingement-Cooled Turbine Leading Edge with Cross-Flow and Dimple," Clean Technol., MDPI, vol. 5(3), pages 1-16, August.
    • Handle: RePEc:gam:jcltec:v:5:y:2023:i:3:p:51-1027:d:1219744
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    References listed on IDEAS

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    1. Luo, Lei & Du, Wei & Wang, Songtao & Wang, Lei & Sundén, Bengt & Zhang, Xinhong, 2017. "Multi-objective optimization of a solar receiver considering both the dimple/protrusion depth and delta-winglet vortex generators," Energy, Elsevier, vol. 137(C), pages 1-19.
    2. Mustafa Alaskari & Arwa M. Kadhim & Ammar A. Farhan & Moustafa Al-Damook & Mansour Al Qubeissi, 2022. "Performance Evaluation of Roughened Solar Air Heaters for Stretched Parameters," Clean Technol., MDPI, vol. 4(2), pages 1-15, June.
    3. Hamed Basir & Shahab Alaviyoun & Marc A. Rosen, 2022. "Thermal Investigation of a Turbocharger Using IR Thermography," Clean Technol., MDPI, vol. 4(2), pages 1-16, April.
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