Blade tip clearance measurement of the turbine engines based on a multi-mode fiber coupled laser ranging system

Guo, Haotian; Duan, Fajie; Wu, Guozhong; Zhang, Jilong

doi:10.1063/1.4901601

Cited by 9 publications

(6 citation statements)

References 16 publications

(15 reference statements)

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“…However, the structure of the mechanical actuator applied to drive the probe is complex and the operation of the device must be skilled, which greatly limits its development [12]. With the development of technology, there are many other tip clearance measuring methods appeared including eddy current, capacitive, microwave and optical fiber methods [13]- [16]. Eddy current system has the advantages of the small size and weight, high precision.…”

Section: Introductionmentioning

confidence: 99%

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Research on the Tip Clearance Measuring Method Based on AC Discharge

Zhang

et al. 2020

IEEE Access

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A new measuring system for the engine tip clearance based on alternate current discharge is proposed in this article. Firstly, theoretical analysis and numerical simulation of the system, as well as the experiment of gas discharge are introduced to prove the feasibility of the method. Then a validation platform is built to study the effects of different probe materials and structures, as well as changes in temperature and humidity under atmospheric pressure on the system. Finally, the system calibration and tip clearance measurement are carried out. The results show that tungsten copper probe with planar structure is more suitable for measuring the tip clearance. When the tip clearance is between 0-6mm, the designed system has high measurement accuracy and its measurement error within 0.05mm. Compared with the traditional spark discharge method, the proposed method not only has the similar advantages, but also overcomes many defects, and has a broader application prospect. INDEX TERMS Tip clearance, AC discharge, measurement accuracy, spark discharge method.

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Section: Introductionmentioning

confidence: 99%

“…Optical fiber method has the advantages of simple structure, stable performance, strong resistance to electromagnetic interference ability, high sensitivity and resolution, but it also has some disadvantages. Among them, the blade reflection loss and high realization costs are the major problems to be solved [16], [27]- [30].…”

Section: Introductionmentioning

confidence: 99%

Research on the Tip Clearance Measuring Method Based on AC Discharge

Zhang

et al. 2020

IEEE Access

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“…At present, a wide range of techniques have been reported on for the measurement of radial clearance D [15][16][17][18][19][20][21][22]. Among these techniques, the fiber-optic-based sensing approaches [17][18][19][20][21][22] are especially favored because of the intrinsic capabilities of optic fiber, such as its light weight, small size, and adaptability for embedding into structures. However, due to the narrow internal space and harsh measurement environment of the rotating machines, the measurement of the tilt angle and axial clearance under high-speed rotation is still a difficult problem that remains unsolved.…”

Section: Introductionmentioning

confidence: 99%

Multi-Parameter Measurement of Rotors Using the Doppler Effect of Frequency-Swept Interferometry

Shao

Wei

Zhang

et al. 2020

Sensors

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The Doppler effect of frequency-swept interferometry (FSI) is often seen as an obstacle to the dynamic ranging accuracy. However, the potential of this obstacle is rarely noticed and used. In this paper, by combining the periodical characteristics of the rotational Doppler effect, an FSI-based multi-parameter measurement method for the rotor is proposed. Through the establishment of the rotational Doppler formula of FSI, it is found that the frequency, direct component, and amplitude of the dynamic distance given by FSI can be utilized to estimate the angular velocity, axial clearance, and tilt angle of the rotor, respectively. A rotor platform and a fiber-optic FSI system were constructed, and a series of experiments were carried out to verify the proposed method. The experimental results showed that the relative errors of the measured axial clearance, angular velocity, and tilt angle were less than 3.5%. This work provides a new perspective on the multi-parameter measurement of the rotor and makes it possible to directly perform multi-parameter measurement inside the space-confined rotating machinery as only a single small-size fiber-optic probe is needed.

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“…It seems obvious that an accurate and real-time measurement technology is necessary. In contrast to power-system turbines where common clearance values range from 2 to 8 mm, in aircraft turbines, TC is typically lower than 3 mm and a resolution better than 25 µm is usually required [ 8 , 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Design, Fabrication and Testing of a High-Sensitive Fibre Sensor for Tip Clearance Measurements

Durana

Amorebieta

Fernandez

et al. 2018

Sensors

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A highly sensitive fibre bundle-based reflective optical sensor has been designed and fabricated for Tip Clearance measurements in a turbine rig. The sensor offers high spatial and temporal resolution. The sensor probe consists of a single-mode transmitting fibre and two concentric rings of receiving multimode fibres that collect reflected light in a differential detection gain configuration, yielding a highly linear calibration curve for distance measurements. The clearance measurement range is approximately 2 mm around the central point fixed at 3.2 mm from the probe tip, and the sensitivity of the probe is 61.73 mm−1. The fibre bundle has been designed to ensure that the distance security specifications required for the experimental program of the turbine are met. The optical sensor has operated under demanding conditions set by the blade and casing design. The experimental results obtained so far are promising and lead us to think that the optical sensor has great potential for online clearance measurements with high precision.

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Blade tip clearance measurement of the turbine engines based on a multi-mode fiber coupled laser ranging system

Cited by 9 publications

References 16 publications

Research on the Tip Clearance Measuring Method Based on AC Discharge

Research on the Tip Clearance Measuring Method Based on AC Discharge

Multi-Parameter Measurement of Rotors Using the Doppler Effect of Frequency-Swept Interferometry

Design, Fabrication and Testing of a High-Sensitive Fibre Sensor for Tip Clearance Measurements

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