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| A Study on the Thermal Calibration Experiment of Irradiated SiC Crystal Temperature Sensors |
| LEI Jian1,LI Yang1,2,CUI Han-xiao3 |
1.China Aviation Development Sichuan Gas Turbine Research Institute, Mianyang, Sichuan 621000,China
2.School of Power and Energy, Northwestern Polytechnical University, Xi′an,Shaanxi 710072,China
3. School of Aeronautics and Astronautics,Sichuan University, Chengdu, Sichuan 610225, China |
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Abstract Irradiated silicon carbide (SiC) temperature sensing is a major diagnostic technique for turbine blades in the process of aero-engine development. Its measurement accuracy depends on the accurate calibration of its response relationship between temperature and its defect concentration. The entire calibration process consists of the temperature calibration experiment, crystal defect characterization and calibration curve identification. The temperature calibration deviation caused by the fluctuation of the temperature field in the calibration test is an important source of the measurement error of the irradiation thermometer crystal. The dominant heat and mass transfer mechanism during the calibration process were studied by experimental and numerical methods, and the effects of the thermophysical parameters of the strut material, temperature overshoot, and temperature disturbance in the quasi thermal equilibrium state on the temperature sensitivity of the temperature measuring crystals were analyzed. The research results found that the measurement error was governed by the non-uniform distribution of thermal radiation field in the axial direction. Finally, the corresponding improvement plans were proposed to improve the geometric configurations and material selection of struts, and to optimize the choice of thermocouples in the calibration procedure of irradiated SiC crystal sensors.
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Received: 20 September 2022
Published: 25 June 2023
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2023, Vol. 44 
