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Scale effect of micro ribs on the turbulent transport in an internal cooling channel
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- Zheng, Shao Fei (author)
- North China Electric Power University
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- Qiu, Yu Ping (author)
- North China Electric Power University
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- Zhang, Yi (author)
- North China Electric Power University
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- (creator_code:org_t)
- 2024
- 2024
- English.
- In: Physics of Fluids. - 1070-6631. ; 36:2
- Journal article (peer-reviewed)
Abstract
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- Owing to the limited supply and pressure margin in the air system, a cooling technique providing efficient heat transfer with lower flow loss is highly desirable for gas turbine blades. Microscale ribs have promised to be a potential cooling candidate. In this work, large eddy simulations are implemented to reveal the scale effect of micro ribs on the near-wall turbulent transport in a cooling channel. Considering a mechanistic study and practical applications, both single-rib and rib-array arrangements are studied with a wide range of dimensionless viscous-scaled rib heights involving the entire boundary layer. The results indicate that the rib-induced destruction and regeneration of coherent structures are, respectively, responsible for the weakened momentum transport and enhanced heat transport in the near-wall region. Using tiny ribs, regenerated quasi-streamwise vortices are mainly located in the buffer layer. The resulting turbulence burst greatly enhances wall heat transfer while keeping a lower flow loss due to the weak form drag. Regenerated hairpin vortices using tall ribs are activated in the log-law layer and intensively interact with mainstream. Along with improved wall heat transfer, the significant form drag results in a remarkably high flow loss. Accordingly, heat transfer and flow loss show different dependencies on the rib height, which contributes to an optimum height interval of ribs (e+ = 20-40) located in the high buffer and low log-law layer for maximizing the overall performance. Furthermore, for the rib-array scheme, adequate inter-rib spacing is essential to achieve turbulence regeneration for enhancing near-wall heat transport.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Energiteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Energy Engineering (hsv//eng)
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- Zheng, Shao Fei
- Qiu, Yu Ping
- Zhang, Yi
- Gao, Shu Rong
- Yang, Yan Ru
- Li, Hai Wang
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- Sunden, Bengt
- Wang, Xiao Dong
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- ENGINEERING AND TECHNOLOGY
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- Lund University
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