厦门大学学报（自然科学版）2026，Vol.65Issue(2)：296-302,7.DOI:10.6043/j.issn.0438-0479.202508003
铠装热电偶护套的发射率测量与分析
Emissivity measurement and analysis of a MIMS thermocouple sheath
周颂平 1张灵林 1翁天恩 2王培勇2
作者信息
- 1. 中国航发商用航空发动机有限责任公司,上海 200241
- 2. 厦门大学航空航天学院,福建 厦门 361005
- 折叠
摘要
Abstract
[Objective]Due to the radiant heat loss,mineral-insulated metal-sheathed(MIMS)thermocouples measure temperatures lower than the actual fluid temperature when they are used in flowing gases.Notably,this radiant heat loss is directly related to the surface emissivity of the thermocouple sheath.To correct the measurement results,herein we investigate the emissivity of the MIMS thermocouple sheath.[Methods]In this study,we measured the emissivity of a 3.2 mm MIMS thermocouple sheath using both fuel-lean and fuel-rich Hencken flames.Computational Fluid Dynamics(CFD)simulations were employed to model the measurement process.By iteratively adjusting the emissivity until the simulated junction temperature matched the experimental temperature reading,the sheath surface emissivity was obtained.[Results]In the fuel-lean flame(oxidizing environment),as the thermocouple temperature increased from 1 073 K to 1 371 K,the sheath emissivity increased from 0.63 to 0.77.In the fuel-rich flame(reducing environment),as the temperature increased from 1 111 K to 1 278 K,the emissivity increased from 0.43 to 0.46.The thermocouple emissivity in the reducing environment was significantly lower than that in the oxidizing environment.This trend of emissivity changing with temperature and oxidation degree is consistent with previous studies,but specific values differ.Such a phenomenon indicates that the composition of the measured gas also affects the sheath emissivity of the MIMS thermocouple.[Conclusion]The composition of the measured gas significantly changes the thermocouple emissivity by altering the surface composition of the MIMS thermocouple sheath.关键词
铠装热电偶/热电偶发射率/温度测量修正/氧化环境/还原环境Key words
MIMS thermocouple/thermocouple emissivity/temperature measurement correction/oxidizing environment/reducing environment分类
能源科技引用本文复制引用
周颂平,张灵林,翁天恩,王培勇..铠装热电偶护套的发射率测量与分析[J].厦门大学学报（自然科学版）,2026,65(2):296-302,7.
