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A method for measuring the temperature and emissivity of turbine blades based on three-band radiant light

A turbine blade and radiant light technology, which is applied in the field of radiation temperature measurement, can solve the problems of large emissivity error and inability to eliminate other background radiation sources, and achieves the effect of small calculation amount and improved measurement accuracy.

Active Publication Date: 2019-05-14
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0006] The main purpose of the present invention is to propose a method for measuring the temperature and emissivity of turbine blades based on three-band radiant light for the problems that other background radiation sources cannot be eliminated by existing turbine blade temperature measuring instruments, and the single-wavelength preset emissivity error is large. , to achieve surface temperature and emissivity measurements of engine turbine blades

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  • A method for measuring the temperature and emissivity of turbine blades based on three-band radiant light
  • A method for measuring the temperature and emissivity of turbine blades based on three-band radiant light
  • A method for measuring the temperature and emissivity of turbine blades based on three-band radiant light

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Embodiment Construction

[0029] For different spectral wavelengths, the selected three PD detectors have different response bands and different sensitivity. According to the detector material and corresponding response characteristics, silicon detectors are mainly used for those below 1.1um, and indium gallium arsenide detectors are used for those above 1.1um. Detectors have different sensitivity to different wavelength bands. Therefore, for the thermal radiation energy emitted from the surface of the turbine blade, the values ​​measured by different detectors should also be different. If the measured radiant energy values ​​are the same for the temperature results of three different detectors through the algorithm, then it can be reasonably inferred that the influence of the reflected radiation errors of other thermal radiation sources on the system does not lead to erroneous measurement results.

[0030] The present invention is based on the Planck blackbody brightness temperature measurement formula

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Abstract

The invention discloses a method for measuring the temperature and emissivity of turbine blades based on three-band radiation light, belongs to the technical field of radiation temperature measurement, and is applied to the surface temperature measurement of turbine blades of aeroengines. By measuring the radiant energy of the turbine blade radiation light in the short, medium and long bands, and then setting the adjustment variable, the real radiant energy of the turbine blade in each band is calculated, and the turbine blade is calculated using the real radiant energy of the two bands. At multiple calculation temperatures, adjust the adjustment variables appropriately according to the temperature of multiple turbine blades obtained until the conditions for ending the calculation are met, and the real temperature of the turbine blades is obtained, and then the turbine blades are calculated using the real temperature and the black body. Emissivity under current working conditions, the method for calculating the surface temperature and emissivity of turbine blades can greatly improve the measurement accuracy of the apparent temperature of turbine blades, and the calculation amount is small, which can meet the requirements of real-time measurement.

Description

Technical field [0001] The invention belongs to the technical field of radiation temperature measurement, and is applied to the measurement of the surface temperature of an aeroengine turbine blade. Background technique [0002] Accurate measurement of the surface temperature of aero-engine turbine blades has always been the key to restricting the development of high-performance and high thrust-to-weight engines in my country. As the most important hot end component of the engine, turbine blades are also the place where the turbine engine works at the highest temperature. Its high temperature resistance is a necessary guarantee for the engine's high temperature operation. Turbine blades need to rotate at high speed under high temperature and high pressure conditions. The mechanical load, aerodynamic load and temperature load it bears are very complicated, and the operating environment is the worst, causing various forms of failure and damage to the turbine rotor, especially the t...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J5/00
CPCG01J5/00
Inventor 王超胡俊张泽展杨洋王飞张晨贵姜晶段英蒋洪川耿慧远王跃明
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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