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

Bin Qu, Zilong Chen, Dengke He, Fei Zeng, Youfu Song (), Yuqing Ouyang and Lei Luo
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Bin Qu: AECC Hunan Aviation Powerplant Research Institute, 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
Youfu Song: AECC Hunan Aviation Powerplant Research Institute, Zhuzhou 412000, China
Yuqing Ouyang: AECC Hunan Aviation Powerplant Research Institute, Zhuzhou 412000, China
Lei Luo: School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150000, China

Clean Technol., 2023, vol. 5, issue 3, 1-16

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.

Keywords: impingement cooling; jet hole diameter; jet hole depth; heat transfer; cross-flow (search for similar items in EconPapers)
JEL-codes: Q2 Q3 Q4 Q5 (search for similar items in EconPapers)
Date: 2023
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