Investigations on the use of Lanthanum STRONTIUM ZIRCONATE (cas 12036-39-4) coating in maintaining temperature distributions of gas turbine blades
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Add time:07/27/2019 Source:sciencedirect.com
Increase in the efficiency of a gas turbine system is possible by operating it at increased temperature of hot working gases. However, it puts a direct thermal load on the material of the blade, which in turn demands for increased cooling capacities for the blade. Present paper deals with simulation based investigations on the effects of a ceramic coating of lanthanum STRONTIUM ZIRCONATE (cas 12036-39-4) layer onto the surface temperature profile of a TMW4 gas turbine blade through an in-between bond coat layer of NiCoCrAlY. The blade model was simulated in ANSYS Workbench v14.5 for an ultra-high temperature of 1700 °C as operating temperature and calculated convection conditions from the gases and coolant air side. Steady state thermal results show a significant effect of coating in lowering substrate temperatures of blade. The results were evaluated for models with variable thickness of coating, maintaining overall dimensions of the blade constant. A blade model of 150/200 (150 microns thick bond coat and 200 microns thick top coat) experienced 8.4% reduction in maximum temperature of the substrate, while this value increased to 26.5% for a 350/1000 model.
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