Experimental study on the influences of mean interface temperature and pressure on thermal contact resistance of the material DD5 and 1Cr11Ni2W2MoV

doi:10.7523/j.ucas.2022.044

Abstract

Abstract: Measuring the thermal contact resistance for the material of key component in aero-engine is very essential for accurate evaluation of temperature distribution about engine, which in turn could provide important reference value for the optimization design of its component, control for tip clearance and thermal protection for material. The material DD5 and 1Cr11Ni2W2MoV, which have good comprehensive properties and excellent thermal fatigue as well as process attributes, are widely used in aero-engine turbine blade and casing, respectively. Based on the actual working conditions of the interface of the engine connecting parts, the thermal contact resistance for the above two materials are measured experimentally according to the steady-state heat flow method, and the influences of interface pressure between 45 MPa and 200 MPa, and temperature ranging from 150℃ and 300℃ on it are investigated. The research indicates that thermal contact resistance displays a power-law relationship with the interface pressure and temperature, and gradually decrease with the increase of them; under the same contact pressure and temperature, thermal contact resistance of the material 1Cr11Ni2W2MoV is smaller than that of DD5 while the gap between both progressively narrows as the pressure grows. In addition, the empirical formulas of thermal contact resistance with the interface pressure and temperature for the two materials are obtained, which could predict the experimental results well, and the relative error with 92.9% of the experimental data is less than 12%.

Key words: thermal contact resistance, steady-state heat flux method, interface pressure, interface temperature, thermal conductivity, yield strength

CLC Number:

TK124

WANG Dichang, LIAN Zengyan, WANG Pei, LIU Jie. Experimental study on the influences of mean interface temperature and pressure on thermal contact resistance of the material DD5 and 1Cr11Ni2W2MoV[J]. Journal of University of Chinese Academy of Sciences, 2023, 40(6): 726-734.

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