Overall Thermal Performances of Double-Wall Effusion Cooling Covered by Simulated Thermal Barrier Coatings

A coupling configuration of double-wall cooling and exterior surface thermal barrier coating (TBC) is one of the most promising thermal protection methods of hot components of modern gas turbine. The combined influences of coating thickness, impingement layout, and cooling air flowrate on the overal...

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Bibliographic Details
Published in:Journal of thermal science 2022, Vol.31 (1), p.224-238
Main Authors: Pu, Jian, Zhang, Tiao, Huang, Xin, Wang, Jianhua, Wu, Weilong
Format: Article
Language:English
Subjects:
Classical and Continuum Physics
Configuration management
Coolants
Cooling
Engineering Fluid Dynamics
Engineering Thermodynamics
Gas turbines
Heat and Mass Transfer
Impingement
Physics
Physics and Astronomy
Temperature ratio
Thermal barrier coatings
Thermal protection
Thermal simulation
Thickness
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Summary:A coupling configuration of double-wall cooling and exterior surface thermal barrier coating (TBC) is one of the most promising thermal protection methods of hot components of modern gas turbine. The combined influences of coating thickness, impingement layout, and cooling air flowrate on the overall thermal performances of such configuration were discussed deeply, to provide the valuable guidance of design. Overall effectiveness measurements were implemented under engine-matched Biot numbers and mainstream-to-coolant temperature ratio. Conjugate heat transfer simulations provided the additional information difficult to be acquired by the measurements. The results indicated that the contribution of TBC is much larger than that of increasing the cooling air amount. The thicker TBC can produce the stronger insulation, while the higher risk of thermal damage of itself. The larger coolant flowrate enlarges the benefit of TBC, while the trend is suppressed by the thick TBC. The constant coating thickness cannot bring to the uniform metal temperature, which can be solved through properly adjusting the backside impingement. The trends in overall effectiveness with TBC’s thickness are independent on the change of internal impingement.
ISSN:1003-2169
1993-033X
DOI:10.1007/s11630-022-1561-5