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System and method for comprehensive measurement of blade tip clearance and blade speed of rotating machinery, and image processing program

A technology of blade tip clearance and rotating machinery, applied in the field of measurement, can solve problems such as distortion in measurement, and achieve the effect of increasing speed, reducing quantity and weight

Active Publication Date: 2019-12-20
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

However, this method is only suitable for low rotational speeds. According to Shannon’s sampling law, when the rotational speed of the measured object is high, the measurement by this method will produce distortion; and this method is only for rotational speed measurement

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  • System and method for comprehensive measurement of blade tip clearance and blade speed of rotating machinery, and image processing program
  • System and method for comprehensive measurement of blade tip clearance and blade speed of rotating machinery, and image processing program

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Embodiment Construction

[0044] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0045] figure 1 A schematic diagram of the image acquisition structure of the present invention is shown, including: a high-frequency image acquisition device 3, the high-frequency image acquisition device 3 can be a CCD camera, or other types of image acquisition devices, and the high-frequency image acquisition device 3 is used for Acquisition of high-frequency images of rotating blades and casings of rotating machinery; image acquisition card 2, which converts the images collected by high-frequency image acquisition device 3 into digital signals, and transmits them to computer 1 in real time through the computer bus for further processing. Next step.

[0046] During specific implementation, first install the high-frequency image ac...

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Abstract

The invention discloses a rotating machinery blade tip clearance and blade rotating speed comprehensive measuring system and method and an image processing program. The effect of measuring the blade tip clearance and the blade rotating speed by only using the high frequency image acquisition device can be achieved. The system comprises an image acquisition device, an image acquisition card and animage processing unit. The image acquisition device is used for acquiring the real-time image of the rotating blade and the case and transmitting the real-time image to the image acquisition card. Theimage acquisition card is used for converting the received signal into the digital signal and transmitting the digital signal to the image processing unit. The image processing unit is used for performing image processing and computing of the received image and also obtaining the blade tip clearance and the blade rotating speed of the measured rotating impeller. The measurement is accurate and the number of the sensor required for measurement is low so that the system and the method can be used for real-time measurement of the rotating machinery blade clearance and rotating speed and have wide application prospect.

Description

technical field [0001] The invention relates to the field of measurement technology, in particular to a system and method for comprehensive measurement of blade tip clearance and blade speed of a rotary machine, and an image processing program. Background technique [0002] The blade tip clearance of the rotating machinery blade generally refers to the radial distance between the rotor blade and the casing of the rotating machinery. Two important parameters of mechanical properties. Take a typical rotating machine—aeroengine as an example. When the tip clearance of an aeroengine is too large, the pressure ratio of the compressor will decrease, fuel consumption will increase, and the efficiency of the engine will also be greatly reduced. However, if the blade tip clearance is too small, due to the expansion of the blade when heated in a high-temperature environment, it may cause friction between the blade tip and the inner wall of the casing, causing damage to parts and affe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M13/00G01D21/02
CPCG01D21/02G01M13/00
Inventor 刘伟民胡忠志
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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