Title: Optimisation of crescent-shaped block upstream of the cylindrical hole to enhance film cooling effectiveness using CFD method and genetic algorithm

Authors: Pengfei Zhang; Chao Zhang; Zhan Wang

Addresses: Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control, School of Mechanical Engineering, Tianjin University of Technology, Tianjin 300384, China; National Demonstration Center for Experimental Mechanical and Electrical Engineering Education, Tianjin University of Technology, Tianjin 300384, China ' Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control, School of Mechanical Engineering, Tianjin University of Technology, Tianjin 300384, China; National Demonstration Center for Experimental Mechanical and Electrical Engineering Education, Tianjin University of Technology, Tianjin 300384, China ' Department of Energy and Power Engineering, Shandong University, Jinan 250061, China

Abstract: This study numerically investigated the optimal geometry of the crescent-shaped upstream block for the typical cylindrical inclined film-cooling hole to improve the cooling performance. The maximum area-averaged cooling effectiveness is pursued using the genetic algorithm combined with the CFD method at two blowing ratios of 0.5 and 1.5. Compared with the reference block, two optimised models obtained under the two blowing ratios increased the area-averaged cooling effectiveness by 127.8% at a blowing ratio of 0.5 and 16.6% at a blowing ratio of 1.5, respectively. The enhancement in the cooling performance mainly results from the improvement in the streamwise coolant coverage and the lateral coolant coverage at blowing ratios of 0.5 and 1.5, respectively.

Keywords: gas turbine; film cooling; crescent-shaped block; cooling effectiveness; optimisation.

DOI: 10.1504/PCFD.2023.129764

Progress in Computational Fluid Dynamics, An International Journal, 2023 Vol.23 No.2, pp.111 - 121

Received: 30 Oct 2021
Accepted: 17 Feb 2022
Published online: 25 Mar 2023 *

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