Abstract
Abstract Thermal barrier coatings (TBCs) as a kind of temperature-resistance materials have been widely applied in super high temperature components in aircraft engines. However, TBCs are subjected to harsh service environment such as high temperature oxidation and erosion, which lead to the coating failure. It is important to investigate the effect of fire temperature, angle and velocity of particle on erosion to understand the failure mechanism. In this paper, the temperature and velocity distributions of erosion particles in high temperature gas burner rig are investigated by using the fluid–solid coupling method with the discrete random walk model. The results show that a non-uniform distribution of temperature appears in different positions of the central axis, and the temperature of particle is affected obviously by the gas stream and particle size. The trajectory of particles and velocity diagrams under different particle size are determined by coupling the continuous phase with the erosion particles.
Highlights
The high inlet temperature is a key character of advanced aircraft engines whose performances are determined by the thermal insulation protection technology of hot components
Thermal barrier coatings (TBCs) are subjected to harsh service environment such as high temperature oxidation and erosion, which lead to the coating failure
The results show that a non-uniform distribution of temperature appears in different positions of the central axis, and the temperature of particle is affected obviously by the gas stream and particle size
Summary
The high inlet temperature is a key character of advanced aircraft engines whose performances are determined by the thermal insulation protection technology of hot components. The simulations of thermal shock and high temperature erosion are realized by the special designed spray gun. The burning gas (such as, C2H2, CH4) and combustion-supporting gas (O2) are mixed in the combustion chamber, the mixed gas are fired and sprayed on the TBCs surface by the spray gun. As the erosion particles are added through the spray gun, the particles accelerate with the high temperature flow and impact on the TBCs surface. This process is used for erosion simulation.
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