Numerical simulation and experimental study of contact thermal resistance under high temperature conditions
Contact thermal resistance is an important indicator of the efficiency of heat transfer between contact interfaces.
The contact thermal resistance between the interfaces of superalloy GH4169 in high temperature was investigated by
using ANSYS. The real surface morphology of superalloy was obtained with optical microscope, and its surface model
was reconstructed in ANSYS. Based on the theory of structural mechanics, the elastoplastic deformation of the micro
structure of the contact interface is simulated, and analyzed and obtained the contact thermal resistance between contact
interfaces. The effect of interface temperature on the radiative heat transfer between the contact interfaces was studied.
At the same time, the impact of radiation heat transfer between contact interfaces in high temperature is considered.
Finally, it was tested by using an experimental test device. The result show that the maximum deviation between the
contact thermal resistance and the contact thermal resistance was 12.60%, and the contact thermal resistance between
superalloy interfaces decreases with the increase of interface temperature and contact pressure; the contact interface
temperature difference increases first and then decreases with the increase of interface temperature.
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