作者：沙朋朋, 郭道勇, 石小江, 林兴梅
作者单位：中国航发四川燃气涡轮研究院, 四川 绵阳 621000
关键词：共极三电偶;双极比较法;激光法;测量精度;时间常数
摘要：
为解决航空发动机恶劣工况下，贵金属电偶在低温测量段热电势较小、灵敏度较低、价格昂贵，多种热电偶结构复杂，且布设到空间同一位置难度较大的问题，基于热电偶测温原理，提出共极多偶的测温方法。设计加工6种不同的共极三电偶组合试验件，采用双极比较法进行静态测试试验，结果表明各测量回路热电特性在相应的温度范围内均具有良好线性度和重复性，并达到Ⅰ级热电偶的精度标准。利用激光法测量共极三电偶的热响应时间常数，测试结果达到航空发动机温度稳态测试指标，具备工程应用价值。
Analysis and research on temperature measurement characteristics of sharing-pole-thermocouple probe
SHA Pengpeng, GUO Daoyong, SHI Xiaojiang, LIN Xingmei
AECC Sichuan Gas Turbine Establishment, Mianyang 621000, China
Abstract: In order to solve the problem in noble metal thermocouple as temperature sensor such as low thermoelectric force,low sensitivity, expensive price, and difficult to set the same position in space. On the basis of the principle of thermocouple thermometry, a temperature measurement method called sharing-pole-thermocouple was proposed. Six kinds of sharing-pole-thermocouples with various combination of polar material were designed and manufactured, and bipolar comparison method was adopted to have static-calibration experiment. The results show that the thermoelectric properties of various measuring circuits have good linearity and repeatability in corresponding temperature range and those thermocouples reach the measurement accuracy of level I thermocouples. The thermal response time constant of the sharing-pole-thermocouple is measured with laser method, and the results show that the thermocouple reaches the static measurement standard of aeroengine experiment. Therefore, the sharing-pole-thermocouple has engineering application value.
Keywords: sharing-pole-thermocouple;bipolar comparison;laser method;measurement accuracy;time constant
2018, 44(6): 146-152 收稿日期: 2017-10-11;收到修改稿日期: 2017-12-29
基金项目:
作者简介: 沙朋朋(1986-),女,山东莱芜市人,工程师,硕士,主要从事航空发动机测试技术工作。
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