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

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...

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Bibliographic Details
Published in:Energies (Basel) 2024-07, Vol.17 (14), p.3404
Main Authors: Cai, Yang, Liu, Xinzi, Sun, Yu, Fan, Xiaojun, Wang, Jiao
Format: Article
Language:English
Subjects:
Aerodynamics
Comparative analysis
Cooling
double-wall cooling
Efficiency
gas turbine blade
Gas turbines
Heat transfer
Nozzle geometry
Numerical analysis
numerical simulation
R&D
Research & development
Reynolds number
Simulation methods
Turbine industry
Turbines
vortex cooling
Vortices
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Summary: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.
ISSN:1996-1073
1996-1073
DOI:10.3390/en17143404