A method for evaluating and predicting the thermal insulation effect of thermal barrier coatings on turbine blades

Abstract

A method for evaluating and predicting the thermal insulation effect of a thermal barrier coating on a turbine blade relates to the technical field of engines, and solves the problem that it is difficult to evaluate and predict the thermal insulation effect of the coating. The method includes the following steps: establishing a one-dimensional coating-air film theory Heat transfer model; based on the model to deduce the heat flow q' and q with or without the thermal barrier coating, according to which the necessary conditions for the thermal barrier coating to play a role in heat insulation are deduced. coefficient and the heat transfer coefficient of the external high temperature gas side without thermal barrier coating, to judge whether the thermal barrier coating has a thermal insulation effect; deduce the temperature difference of the outermost side with or without thermal barrier coating and with or without thermal barrier coating The proportional relationship between the temperature difference between the outer surface of the blade metal substrate, by measuring the outer surface temperature of the thermal barrier coating and the temperature of the outer surface of the blade metal substrate without thermal barrier coating, and then predicting the thermal barrier coating according to the proportional relationship. The numerical value of the surface temperature drop. The present invention can realize the accurate prediction of the thermal insulation effect.

Description

technical field [0001] The invention relates to the technical field of engineering thermophysics and high-performance aero-engines, in particular to a method for evaluating and predicting the thermal insulation effect of a thermal barrier coating of a turbine blade. Background technique [0002] Thermal barrier coatings are widely used in turbine blades by utilizing the superior high temperature resistance, corrosion resistance, wear resistance and thermal insulation properties of ceramic materials to improve the ability of structural parts to resist high temperature corrosion. A large number of applications and technological development of thermal barrier coatings have significantly improved the high temperature resistance of the blades, thereby increasing the temperature in front of the engine turbine, thereby improving the performance of the engine. It prolongs the life and reliability of the blades, reduces the amount of cold air used, and allows more working fluids to p...

AI Technical Summary

Problems solved by technology

At the same time, some studies have found that thermal barrier coatings have a greater impact on film cooling, but the mechanism of the two is not clear enough, and the relevant data is not sufficient, which makes it more difficult to evaluate and predict the thermal insulation effect of coatings

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