Dynamic synchronous measurement method of turbine blade speed and blade tip clearance based on laser self-mixing principle

被引：0
|
作者：
Wu J. [1 ]
Chen Y. [1 ]
Zhao J. [2 ]
Chen J. [3 ]
Guo R. [3 ]
机构：
[1] School of Aeronautical Engineering, Civil Aviation University of China, Tianjin
[2] Xinzhou Comprehensive Inspection and Testing Center, Xinzhou
[3] School of Electronic Information and Automation, Civil Aviation University of China, Tianjin
来源：
Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument | 2023年 / 44卷 / 11期
关键词：
blade tip clearance; dynamically synchronized measurement; laser self-mixing interference; signal processing; turbine blade rotational speed;
D O I：
10.19650/j.cnki.cjsi.J2311652
中图分类号：
学科分类号：
摘要：
The turbine tip clearance measurement has problems of poor stability, easy interference and low accuracy at high speed of aero-engine in harsh environments such as high temperature. To address these issues, a dynamic synchronous measurement method of turbine blade speed and tip clearance based on the principle of laser self-mixing is proposed. Firstly, a self-hybrid interference model based on the three-mirror F-P cavity model is proposed, and a mathematical model of velocimetry and ranging is formulated on this basis. Then, the processing of dynamic self-mixing interference signals under the rotation of turbine blades is studied, and the collected signals are successively processed by bandpass filtering and wavelet noise reduction. FFT is used to obtain the frequency and the blade tip clearance value. After that, static and dynamic laser self-hybrid interferometric ranging experiments are implemented for verification. Finally, the error sources affecting dynamic measurement are discussed, and the measurement system and algorithm are optimized and compensated. Experimental results show that this method can effectively improve the stability and accuracy of synchronous measurement of turbine blade speed and tip clearance. The relative error of speed measurement is 1%, and the error of tip clearance measurement is 23 μm. © 2023 Science Press. All rights reserved.
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页码：13 / 21
页数：8
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