Numerical Investigation of the Effects of Lattice Array Structures on Film Cooling Performance

Qiang Fu, Xiaobo Luo, Wei Chen and Minking K. Chyu
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Qiang Fu: School of Aeronautics and Astronautics, Sichuan University, Chengdu 610065, China
Xiaobo Luo: Sichuan Gas Turbine Establishment, Aero Engine Corporation of China, Chengdu 610599, China
Wei Chen: School of Aeronautics and Astronautics, Sichuan University, Chengdu 610065, China
Minking K. Chyu: Pittsburgh Institute, Sichuan University, Chengdu 610065, China

Energies, 2022, vol. 15, issue 13, 1-15

Abstract: To better understand the mechanism influencing the periodic lattice structures in gas turbine blade cooling, these numerical simulations present a systematic comparison of the effects in cases involving pin-fin, Kagome, and BCC lattice arrays on film-cooling effectiveness under three blowing ratios (i.e., M = 0.5, 1.0, and 1.5). The results indicate that the introduction of lattice array structures improves film-cooling effectiveness within the whole streamwise range, especially downstream of the film hole. With an increase in the blowing ratio, the superiority of lattice array structures relative to those without a lattice becomes increasingly evident. The local film-cooling effectiveness can be increased, to a maximum of about 100%, under a blowing ratio of 1.5. The secondary flow induced by the lattice array structure at the internal flow channel increases the TKE and accelerates the development of vortices in the film cooling hole. Using the lattice array model, the improvement of the Kagome and BCC lattice arrays in terms of film cooling is better than those of pin-fins. In addition, the effect of lattice arrays on film-cooling effectiveness is different at various blowing ratios, and the lattice array structures have little impact on the film cooling at a relatively low blowing ratio.

Keywords: film cooling; lattice array structure; blow ratio; flow structure; cross flow (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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