首页|热电偶非稳态测温误差特性一维分析

热电偶非稳态测温误差特性一维分析

One-dimensional analysis of unsteady temperature measurement error characteristics of thermocouple

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为揭示热电偶非稳态测温误差的影响机制,建立了热电偶测温一维非稳态计算模型,综合评估了不同安装结构、黏合材料和表面传热系数工况对热电偶非稳态测温误差的影响,深入探究了毕渥数对非稳态测温的影响规律.研究结果表明:考虑环境辐射是必要的,与不考虑辐射传热相比测温时间300s时的温度相差1.48K.不同的安装方式对测温误差的影响较大,最大测量温差1.85 K.黏合材料的导热系数越大,正规状况阶段非稳态测温误差越小,测温时间150 s后绝对误差小于0.5 K.表面传热系数对非稳态测温误差起着重要的影响,表面传热系数越大,受初始温度场影响的测温误差越大.黏合材料导热系数为2.4W/(m·K)时,表面传热系数为50～250 W/(m2·K)的范围内测温误差的变化范围为0.2～1.5K.研究结果为发动机传热实验中壁温非稳态测量提供了参考.
To reveal the influence mechanism of temperature measurement error of thermocouple under unsteady operating conditions,one-dimensional unsteady calculation model of temperature measurement of thermocouple was established.A comprehensive evaluation was conducted to reveal the influence of different installation structures,bonding materials and surface heat transfer coefficient conditions on the unsteady temperature measurement error for the thermocouple.The influence of Biot number on unsteady temperature measurement was further explored.Results showed that it is necessary to consider environmental radiation effect.Temperature error was 1.48 K at 300 s temperature measurement time compared with that without consideration of environmental radiation effect.Different installation structures of thermocouple had a greater impact on the temperature measurement error,with a maximum measurement temperature difference of 1.85 K.Moreover,the greater thermal conductivity of the bonding material indicated,the smaller temperature measurement error in the stage of unsteady regular status,and the absolute error was less than 0.5 K after 150 s temperature measurement time.Especially,the surface heat transfer coefficient played an important role in the unsteady temperature measurement error.The larger surface heat transfer coefficient indicated the greater temperature measurement error due to initial temperature field.When the thermal conductivity of bonding material was 2.4 W/(m·K),the variation range of temperature measurement error within the surface heat transfer coefficient range of 50-250 W/(m2·K)was 0.2-0.5 K.Therefore,the research results can provide a reference for the unsteady measurement of wall temperature in the heat transfer experiments of aero-engine.

thermocouplescontact temperature measurementunsteady statemeasurement temperature errorsurface heat transfer coefficientone-dimensional analysis

郭苗昕、冯青、畅然、樊光亚、林阿强、陈燕、刘高文

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西北工业大学 动力与能源学院,西安 710072

中国航空工业集团有限公司 第一飞机设计研究院,西安 710089

西北工业大学 深圳研究院,广东深圳 518057

西北工业大学 陕西省航空动力系统热科学重点实验室,西安 710072

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热电偶 接触式测温 非稳态 测温误差 表面传热系数 一维分析

广东省基础与应用基础研究基金航空发动机及燃气轮机基础科学中心项目

2023A1515011597P2022-A-Ⅱ-007-001

2024

10.13224/j.cnki.jasp.20220235

航空动力学报
中国航空学会

航空动力学报

CSTPCD北大核心
影响因子：0.59
ISSN：1000-8055
年,卷(期)：2024.39(3)
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