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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