On-line measurement system for axial clearance of rotor stator based on Fizeau common-optical path structure

Abstract

The invention relates to the field of non-contact ranging and proposes an on-line measurement system for the axial clearance of a rotor stator based on a Fizeau common-optical path structure. According to the system, non-contact real-time online accurate measurement of the axial clearance of the rotor stator of the aero-engine under the high temperature and space constraints is realized by designing a Fizeau common-optical path structure and a small-size and high-temperature-resistant fiber sensor; and the running state of the rotor stator of the engine is monitored and the basic data source is provided for the optimal design and control of the axial clearance of the rotor stator of the modern aero-engine. Therefore, the on-line measurement system comprises a frequency sweeping light source, an optical fiber, a coupler, a circulator, a fiber probe, a photodiode, a signal conditioning module, a signal acquisition module, a coupler, a fiber retarder, a balanced receiving module, a zero-crossing detection module, and controller. The on-line measurement system is mainly applied to the non-contact ranging occasion.

Description

Technical field [0001] The invention relates to the field of non-contact ranging, in particular to the field of measuring the axial clearance of the rotor stator of an aeroengine. Background technique [0002] The aero engine is called the jewel in the industrial crown, the "heart" of the aircraft, and one of the bottlenecks restricting the development of my country's aviation industry. Modern aero-engines are developing towards high thrust-to-weight ratio, high supercharging ratio and high front-turbine temperature. The core components of the engine work in the extreme state, and the axial movement between the rotor and stator is one of the important factors affecting the performance and safety of the engine. In the transition state of the operating state, the aero-engine is subjected to the action of many non-linear excitation sources, which directly cause deformation and axial movement between the rotor and stator components, resulting in the casing and the rotor, the sealing ...

AI Technical Summary

Problems solved by technology

[0003] Due to the measurement process of the rotor-stator axial clearance of the aero-engine, the measurement environment temperature is high (300°C / 450°C), the measurement space is narrow, the signal line lead-out path is complicated, and the measurement range is large (the range of the tip clearance is generally about 3mm, while the shaft The axial gap measurement range is generally about 10mm), the measurement accuracy is high, and the sensor installation space is small. So far, there is no effective means of measuring the rotor-stator axial gap.

The dynamic change law of the axial gap between the rotor and stator of the aero-engine is not yet clear, and the resulting lack of data has become one of the bottlenecks restricting the optimal design and operation safety monitoring of aero-engines

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