Unique Coolant Supply Passage Arrangements to Induce Large-Scale Vortex within Turbine Blade Interior Leading Edge Chambers

Yang Cai, Xinzi Liu, Yu Sun, Xiaojun Fan () and Jiao Wang
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Yang Cai: School of Power and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212100, China
Xinzi Liu: College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 21016, China
Yu Sun: School of Power and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212100, China
Xiaojun Fan: School of Power and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212100, China
Jiao Wang: School of Power and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212100, China

Energies, 2024, vol. 17, issue 14, 1-19

Abstract: Gas turbines are widely applied in many fields, and blade cooling is a key way to improve gas turbines’ power and efficiency. In order to explore a high-efficiency cooling method, a new variant configuration with unique coolant supply passage arrangements is proposed and explored in this paper. The numerical simulation method of solving the Navier–Stokes equations is used after mesh independence calculation and turbulence model validation. The results show that the variant structure has better streamlines distribution with double vortex flows in both the inner and outer chambers. Compared to the original configuration, the heat transfer intensity in the outer chamber is improved, and the globally averaged Nusselt number is 17.1% larger. The case with uniformly distributed nozzles has the best flow and heat transfer performance. As the nozzle number increases, the total pressure loss and friction coefficient decrease, but the heat transfer increases first and then decreases. The case of three nozzles has the best comprehensive cooling behavior. The aspect ratio has important influences on the double-vortex cooling configuration. Cases with small aspect ratios have higher local heat transfer intensity, but the flow loss is larger. The case with aspect ratio 4 has the best cooling performance.

Keywords: gas turbine blade; vortex cooling; double-wall cooling; numerical simulation (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: 2024
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