Infrared detection of thermal barrier coatings excited by hot water bath 3D numerical simulation based on COMSOL

In order to add more infrared excitation methods, the infrared thermal wave detection method of thermal barrier coating excited by hot water bath is put forward, and the three-dimensional simulation model of thermal barrier coating is established to simulate the thermal barrier coating heated by water vapor. The temperature field changes of different debonding defects diameters at different times are analyzed. The results show that when water vapor covers the whole contact surface, the image acquisition effect is the best. Different debonding defects diameters have little effect on contrast, but have great influence on temperature difference. Therefore, the combination of appropriate infrared thermal imager and hot water bath method can detect very small debonding defects. When the water vapor covers the whole contact surface, the image acquisition effect is the best.