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Tip clearance measurement method based on all-fiber tip timing

A technology of blade tip timing and blade tip clearance, which is used in measuring devices, optical devices, instruments, etc., to achieve the effects of strong anti-electromagnetic interference ability, improved clearance measurement accuracy, and fast dynamic response speed.

Inactive Publication Date: 2015-04-08
TIANJIN UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

Therefore, although the online measurement of blade tip clearance of rotating machinery is extremely challenging, it needs to be solved urgently

Method used

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  • Tip clearance measurement method based on all-fiber tip timing
  • Tip clearance measurement method based on all-fiber tip timing
  • Tip clearance measurement method based on all-fiber tip timing

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Embodiment Construction

[0027] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the embodiments of the present invention in detail.

[0028] The laser triangulation method is suitable for short-range high-precision measurement. The basic principle is to place the light source, the surface of the measured object and the receiving system at three points to form a triangular light path, and then calculate the measured object based on the mathematical relationship between similar triangles Small displacement of the surface of the object. Among them, the single-point laser triangulation method can be divided into two types: the direct type and the oblique type according to the incident mode of the light source.

[0029] The principle of the direct laser triangulation method is: after the laser is focused by the transmitting lens, it is incident perpendicularly to the surface of the object to be measured; when the object to be...

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Abstract

The invention discloses a tip clearance measurement method based on all-fiber tip timing. The method comprises the following steps: converting measurement on length measurement in a triangle method into measurement on a tip timing signal; adopting two fiber bundle type timing sensors, and enabling emission fibers in the timing sensors to emit two beams of auto-collimation emergent light with different wavelengths; enabling receiving fibers in the timing sensors to receive moment signals when leaves approach and leave a measurement region; monitoring the rotating speed of a rotor in real time by a rotating speed synchronization sensor; performing high-speed signal acquisition and circuit module processing on all the sensor signals, and reversely calculating a distance between the end face of each sensor and each leaf tip by an upper computer through a math model. According to the tip clearance measurement method, a clearance value is ingeniously converted into a tip timing signal relevant to the clearance value, so that a measurement system is irrelative to most environmental factors such as the leaf and electromagnetic interference, and the interference resistance and the clearance measurement precision of the system are improved.

Description

Technical field [0001] The invention relates to the field of blade tip gap measurement, in particular to a blade tip gap measurement method based on all-fiber tip timing. Background technique [0002] As one of the important parameters of major equipment such as aero-engines, the online tip clearance measurement technology of rotating machinery blades is of great significance to the technological development of such equipment. The existence of the tip clearance causes the fluid to leak, and affects the ideal flow state of the fluid, thereby reducing the working temperature and efficiency. [0003] The tip clearance is equivalent to a source of power leakage, and making the tip clearance as small as possible to the best value is beneficial to improve the performance and efficiency of the engine. However, if the blade tip clearance is too small, it will increase the possibility of the blade tip and the casing being rubbed, thereby threatening the safe operation of the engine and the...

Claims

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Application Information

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IPC IPC(8): G01B11/14
Inventor 段发阶蒋佳佳郭浩天叶德超李杨宗王凯张继龙
Owner TIANJIN UNIV
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