During the PS-90A engine tests, significant differences in the dynamics of turbine blade temperatures recorded were noted by the data obtained from the monochromatic and bichromatic pyrometers. To analyze the experimental data we created a mathematical model of the pyrometer that takes into account heat transfer processes by radiation in the blade passage. The modeling carried out made it possible to evaluate the relation between the radiation flow intensity at the pyrometer inlet and the thermodynamic blade temperature.
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