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- Zheng, Shao FeiNorth China Electric Power University (author)
Scale effect of micro ribs on the turbulent transport in an internal cooling channel
- Article/chapterEnglish2024
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- 2024
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- LIBRIS-ID:oai:lup.lub.lu.se:8df8df0b-bd85-4508-811d-1af313a03b22
- https://lup.lub.lu.se/record/8df8df0b-bd85-4508-811d-1af313a03b22URI
- https://doi.org/10.1063/5.0186554DOI
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- Language:English
- Summary in:English
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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.
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- Qiu, Yu PingNorth China Electric Power University (author)
- Zhang, YiNorth China Electric Power University (author)
- Gao, Shu RongNorth China Electric Power University (author)
- Yang, Yan RuNorth China Electric Power University (author)
- Li, Hai WangBeihang University (author)
- Sunden, BengtLund University,Lunds universitet,NanoLund: Centre for Nanoscience,Annan verksamhet, LTH,Lunds Tekniska Högskola,Värmeöverföring,Institutionen för energivetenskaper,Institutioner vid LTH,LTH profilområde: Nanovetenskap och halvledarteknologi,LTH profilområden,LU profilområde: Ljus och material,Lunds universitets profilområden,Other operations, LTH,Faculty of Engineering, LTH,Heat Transfer,Department of Energy Sciences,Departments at LTH,Faculty of Engineering, LTH,LTH Profile Area: Nanoscience and Semiconductor Technology,LTH Profile areas,Faculty of Engineering, LTH,LU Profile Area: Light and Materials,Lund University Profile areas(Swepub:lu)vok-bsu (author)
- Wang, Xiao DongNorth China Electric Power University (author)
- North China Electric Power UniversityBeihang University (creator_code:org_t)
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- In:Physics of Fluids36:21070-6631
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