Numerical study on the effect of different internal angled ribs on the external film cooling performance

Xiang Cheng, Qiu Nan Yu, Wen Tao Ji*, Jun Mei Wu, Ya Ling He, Wen Quan Tao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


For the blades of gas turbine, the traditional internal ribs have a great impact on the film cooling heat transfer of blade external surface. In this study, SST k-ω turbulence coupled with transition model is adopted to study the effects of angled ribbed passages on external flow and heat transfer characteristics. The detailed flow characteristics were analyzed for two vertically placed flat-plate channels with the blowing ratios of 0.5∼2. The computational model includes a single film hole (D = 20 mm) with a jet angle of 35°. Four different rib orientations in the secondary flow channels are designed. They are no rib, oblique rib 1 (30° angle from the horizontal line), oblique rib 2 (symmetrical to oblique rib 1), and straight rib. Compared with ribless channel, the average adiabatic film cooling effectiveness of straight rib, Oblique rib 1, Oblique rib 2 are 2.3, 2.2, and 1.9 times higher at different Reynolds numbers, respectively. Taking the film hole as the origin, Oblique rib 2 can greatly improve the overall cooling effectiveness. Oblique rib 1 can improve the cooling effectiveness of the farther downstream wall surface. The comparison of film cooling efficiency, coolant coverage area, flow behavior inside the film hole and that in the downstream, heat transfer and transition behavior for different channels are also analyzed separately. Through the investigations, it helps to understand the effects of internal rib angle on the flow, friction factor and heat transfer outside the film holes.

Original languageEnglish
Pages (from-to)1683-1698
Number of pages16
JournalProceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy
Issue number8
Publication statusPublished - Dec 2023
Externally publishedYes


  • Film cooling heat transfer
  • Gas turbine blade
  • Numerical simulation
  • Rib Layouts
  • Turbulence models


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