Turbine blade thermal barrier coating thermal insulation effect evaluation and prediction method

Abstract

A turbine blade thermal barrier coating heat insulation effect evaluation and prediction method relates to the technical field of engines, solves the problem that the coating heat insulation effect is difficult to evaluate and predict, and comprises the following steps: establishing a one-dimensional coating-gas film theory heat exchange model; deriving heat flows q' and q when the thermal barrier coating exists or not based on the model, deriving necessary conditions for the thermal barrier coating to play a heat insulation role, and judging whether the thermal barrier coating plays a heat insulation role or not by measuring an external high-temperature fuel gas side heat exchange coefficient when the thermal barrier coating exists and an external high-temperature fuel gas side heat exchange coefficient when the thermal barrier coating does not exist; deducing the proportional relation between the temperature difference of the outermost side when the thermal barrier coating exists or not and the temperature difference of the outer surface of the blade metal matrix when the thermal barrier coating exists or not, measuring the temperature of the outer surface of the thermal barrier coating and the temperature of the outer surface of the blade metal matrix when the thermal barrier coating does not exist, and predicting the value of temperature reduction of the outer surface of the blade metal matrix caused by the thermal barrier coating according to the proportional relation. According to the invention, accurate prediction of the heat insulation effect is realized.

Description

technical field [0001] The invention relates to the technical fields of engineering thermophysics and high-performance aeroengines, in particular to a method for evaluating and predicting the heat insulation effect of a thermal barrier coating on 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 heat 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 before the engine turbine, thereby improving the performance of the engine. It prolongs the life and reliability of the blades, and can reduce the amount of cold air used, allowing more working fluid to particip...

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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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