| Citation: | Zou Qicai, Wang Anliang. Experimental correlation development for thermal contact resistance of IN718 alloy[J]. Journal of Aerospace Power, 2026, 41（X）：20250550 doi: 10.13224/j.cnki.jasp.20250550
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Thermal contact resistance (TCR) at the interfaces of turbine shafts and blades is critical for the thermal analysis and durability design of aero-engines. To address this, a novel experimental apparatus based on the steady-state heat flux method was developed to measure TCR in IN718 superalloy contacts. The measurement uncertainty of the setup was first evaluated using a single-point TCR method, which demonstrated that the relative errors for dimensionless single-point TCR were within 18%. Subsequently, experimental investigations were conducted to examine the effects of two levels of surface roughness, interface pressure (0.05—10 MPa), and mean interface temperature (20—160 ℃) on the TCR of IN718 specimens. The results indicate that TCR decreases with increasing pressure and temperature, but increases with higher surface roughness. A comparison of the experimental data with existing classical semi-empirical models revealed significant prediction inaccuracies, particularly within specific pressure and roughness ranges. Consequently, by accounting for both the Gaussian and non-Gaussian distribution characteristics of the surface profile, a new dimensionless empirical correlation was proposed. The average error between the predicted values from this correlation and the experimental data is less than 10%.
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