Influence of material properties on temperature and thermal stress of thermal barrier coating near a normal cooling hole

Kim, Kyung Min; Shin, Sangwoo; Lee, Dong Hoon; Cho, Hyung Hee

doi:10.1016/j.ijheatmasstransfer.2011.08.026

Cited by 44 publications

(12 citation statements)

References 27 publications

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“…The thermal barrier coatings, made of the Y 2 O 3 stabilized ZrO 2 ceramics, are used to provide thermal insulation to the interior metallic components from the hot gas stream in gas turbine engines for aircraft propulsion, power generation, and marine propulsion [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Enhanced insulation temperature and the reduced thermal conductivity of nanostructured ceramic coating systems

Liang

Wei

Chang

et al. 2013

International Journal of Heat and Mass Transfer

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a b s t r a c tThe theoretical model on the size-dependent thermal conductivity of the nanograins and the composites, based on the phonon confinement and the boundary scattering effects, was developed to predict the 68% reduced thermal conductivity of the nanostructured ceramic coatings made of grains of 40-100 nm compared with the conventional ceramic coatings with micron-scale grains. In order to validate the model, the nanostructured zirconia layers and the corresponding conventional layers were sprayed on the same alloy matrixes, and the insulation temperatures were measured at different temperatures up to 1273 K. It was found that insulation temperature of the nanostructured ceramic systems enhanced about 200 K at most compared with that of the conventional ones. And the average enhancement of the insulation effect is in agreement with the theoretical prediction. The nanostructured ceramic coated systems provide the extending application in thermal barrier engineering, thermoelectric devices and other related applications.

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Section: Introductionmentioning

confidence: 99%

Enhanced insulation temperature and the reduced thermal conductivity of nanostructured ceramic coating systems

Liang

Wei

Chang

et al. 2013

International Journal of Heat and Mass Transfer

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“…Tables 2 and 3 show the inlet conditions and the design point of micro gas turbine. [14] 40.7 W Rotating speed 400,000 RPM Table 3 Design point of micro gas turbine [15].…”

Section: Numerical Analysismentioning

confidence: 99%

Effect of the thermal insulation on generator and micro gas turbine system

Park

Kim

et al. 2013

Energy

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“…In other words, if an operation condition is unsuitable, local thermal cracks and structural failure may occur due to the high thermal stress. Therefore, a thermal analysis [9][10][11] and a failure analysis [12][13][14][15][16] are required for an effective thermal design.…”

Section: Introductionmentioning

confidence: 99%

“…They found that the highest temperature and stress appear in the cooling system. Also, they [12][13][14][15][16] have attempted a thermal stress analysis as well as a lifetime prediction for hot components of gas turbines and have compared their results to actual thermal damage. It has been shown that the computational results are useful for investigating the thermal problems of the gas turbine as well as for defining the factors that contribute to advanced maintenance and operation.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, thermal failure and cracking depend on various factors, such as the material properties, hot gas flow temperature, thermo-mechanical cycle, thermal shock, microstructure, initial bubble, mechanical/chemical erosions, etc. Previous studies [16,[23][24][25][26][27] have mainly focused on the material properties in a convectional cooling system. Kim et al [10] and Lee et al [11] found that thermal stresses are generated at the edges in the coating system due to thermal expansion and constraints.…”

Section: Introductionmentioning

confidence: 99%

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