作者：丁水汀1,2,3, 丁凯3, 邱天3
作者单位：1. 北京市航空器/发动机复杂系统安全性重点实验室, 北京 100191;
2. 先进航空发动机协同创新中心, 北京 100191;
3. 北京航空航天大学能源与动力工程学院, 北京 100191
关键词：流体温度测试;双热电偶方法;集总参数法;后处理算法
摘要：
针对目前航空发动机空气系统瞬态温度测试频响的需求，提出一种基于双热电偶的瞬态流体温度测试方法。该方法利用两个结点大小相同但材料不同的热电偶测量流体同一空间点的温度，并基于集总参数法反推出流体真实温度，并给出考虑误差的后处理算法。基于固体导热数值计算，验证此方法的可行性及相关后处理方法的可用性。采用双热电偶装置，对管道流动温度变化进行测量，基于微细热电偶的测量结果标定两支热电偶的物性参数比，应用后处理程序实现流体温度的反推。试验结果表明：标定段的反推流体温度平均测量误差率为0.52%，校验段的反推流体温度平均测量误差率为1.6%，反推流体温度的响应速度与微细热电偶响应速度相当。
Research on transient fluid temperature measurement method based on double-thermocouple
DING Shuiting1,2,3, DING Kai3, QIU Tian3
1. Beijing Key Laboratory on Safety of Integrated Aircraft and Propulsion System, Beijing 100191, China;
2. Co-Innovation Center for Advanced Aero-Engine, Beijing 100191, China;
3. School of Energy and Power Engineering, Beihang University, Beijing 100191, China
Abstract: According to the demand of transient temperature test for air system of current aeroengine, a transient fluid temperature test method based on double-thermocouple was proposed. The method used two thermocouples with the two nodes in same size but different materials to measure the temperature of the same spatial point of the thermocouple fluid, and deduced the true temperature of the fluid based on the lumped parameter method. On this basis, a post-processing algorithm was given considering the error. Based on numerical calculation of solid thermal conductivity, the feasibility of this method and the usability of the relevant post-processing method were verified. Using the double-thermocouple device, the temperature change in the pipeline flow was measured, and the ratio of physical property parameter of two thermocouples was demarcated according to the measurement results of micro-thermocouple. Based on the experiment data, the fluid temperature was reversed on the post-processing algorithm. The test results show that average measurement error estimation of deduced fluid temperature is 0.52% in calibration area and is 1.6% in the check area. The response speed of the deduced fluid temperature is equivalent to that of the micro-thermocouple.
Keywords: fluid temperature measurement;double-thermocouple method;lumped parameter method;post-processing algorithm
2017, 43(9): 1-7 收稿日期: 2017-03-29;收到修改稿日期: 2017-05-03
基金项目: 中国博士后科学基金资助项目（2016M591047）
作者简介: 丁水汀(1967-),男,辽宁铁岭市人,教授,博士,研究方向为燃气轮机热端旋转部件流动与换热机理及航空发动机适航性设计与验证技术。
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