Working condition simulation method for device coated with thermal barrier coating

Abstract

A working condition simulation method for a device coated with a thermal barrier coating. The working condition simulation method comprises the following steps of: S1, establishing a geometrical model that contains a coating interface and is coated with the thermal barrier coating; S2, establishing a solid region calculation model corresponding to the geometrical model; S3, establishing an external flow field model corresponding to the geometrical model in S1; S4, carrying out fluid pre-analysis processing on the external flow field model to generate a fluid region calculation model; S5, obtaining temperature field data and stress field data of the device coated with the thermal barrier coating; and S6, generating an external surface temperature field and a stress field distribution diagram of the device coated with the thermal barrier coating. With the adoption of the simulation method provided by the invention, the movement of fluid of an external fluid field can be accurately simulated, so that the accuracy of the temperature field is guaranteed and the change of structural thermal stress also can be accurately simulated while sufficiently considering the condition of geometrical complexity of the device; and furthermore, the cost of researching a damage mechanism of the thermal barrier coating under a high-temperature service environment is greatly reduced; and economic benefits are good.

Description

technical field [0001] The invention relates to the technical field of heat-insulating protective coating systems in high-performance aero-engines, in particular to a method for simulating working conditions of devices coated with thermal barrier coatings. Background technique [0002] Thermal barrier coatings (TBCs for short) are a layer of ceramic coatings that are deposited on the surface of high temperature resistant metals or superalloys. The thermal barrier coating acts as a heat insulator for the base material, which can reduce the temperature of the base, so that the devices made of it (such as engine turbine blades) can operate at high temperatures, with high melting point, low thermal conductivity, corrosion resistance, Features of thermal shock resistance. During high-temperature service, thermal barrier coatings can protect high-temperature substrates, increase the temperature and thermal efficiency of heat engines, and thus are widely used in the fields of avia...

AI Technical Summary

Problems solved by technology

[0003] However, in the process of practical application, due to the influence of material parameter mismatch and thermal residual stress, high temperature sintering effect of ceramic materials, high temperature creep, high temperature fatigue, high temperature interface oxidation, etc., crack initiation and propagation are prone to occur in the coating , resulting in the peeling off of the thermal barrier coating

Once the coating is peeled off, the base metal parts will be exposed to high temperature environment, and the consequences are very serious

[0004] Therefore, it is very important to study the damage mechanism of thermal barrier coatings in high temperature service environment. However, due to the extremely complex service environment of thermal barrier coating turbine blades, it requires a huge

Images