作者：王强¹, 叶德超², 盖文¹, 梁杰¹, 姚程炜¹

作者单位：1. 中国空气动力研究与发展中心设备设计及测试技术研究所，四川 绵阳 621000;
2. 天津大学 精密测试技术及仪器国家重点实验室，天津 300072

关键词：光纤传感器;叶尖定时;叶尖间隙;轴流压缩机;超低温

摘要：

为对某型低温轴流压缩机叶尖间隙进行在线健康监测，设计制作一种低温光纤式叶尖定时传感器，并开展超低温环境静态实验，以期验证该传感器在低温环境下使用的可行性。实验模拟从常温到−196 ℃范围的3种温度工况，测试每种工况下该低温光纤式叶尖定时传感器的接收反射光强转换电压值。实验结果表明，该传感器接收反射光强转换电压值虽然呈现出随环境温度降低而减弱的正相关性，但仍满足测试系统有效识别叶片到达时刻对接收反射光强的基本需求。同时，进一步结合分析低温轴流压缩机内部运行介质为干燥纯净氮气有利于光束发射传输和反射接收的环境特点，该低温光纤式叶尖定时传感器用于低温轴流压缩机叶片叶尖间隙在线健康监测是完全可行的。

Static experiment research on optical fiber tip-timing sensor in ultra-low temperature environment
WANG Qiang¹, YE Dechao², GAI Wen¹, LIANG Jie¹, YAO Chengwei¹
1. Facility Design and Instrumentation Institute, China Aerodynamics Research and Development Center, Mianyang 621000, China;
2. State Key Laboratory of Precision Measuring Technology & Instruments, Tianjin University, Tianjin 300072, China
Abstract: In order to conduct online health monitoring of the tip clearance of a certain type of low-temperature axial compressor, an ultra-low temperature optical fiber sensor based on the timing principle was designed and customized, and static experiments in ultra-low temperature environments were carried out to verify the feasibility of the sensor in a low temperature environment. The experiment simulates 3 working conditions ranging from normal temperature to –196 ℃, and tests the intensity of the received reflected light signal of the sensor under each working condition. Experimental results show that although the sensor's received reflected light intensity weakens with the decrease of ambient temperature, it is still sufficient to effectively identify the arrival time of the blade and meet the system test requirements. Furthermore, considering the environmental characteristics of dry and pure nitrogen inside the low-temperature axial compressor, which is beneficial to the optical transmission, the ultra-low temperature optical fiber sensor is practical and feasible for online health monitoring of the low-temperature axial compressor blade tip clearance.
Keywords: optical fiber sensor;tip-timing;tip clearance;axial compressor;ultra-low temperature
2020, 46(12):163-168  收稿日期: 2020-09-28;收到修改稿日期: 2020-10-28
基金项目:
作者简介: 王强(1990-),男,重庆市人,工程师,硕士,研究方向为风洞测控与健康监测技术
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