A four-spectrum turbine blade radiation temperature measurement method

A technology of turbine blade and radiation temperature measurement, which is applied in the fields of optical radiation measurement, radiation pyrometry, temperature recording method, etc.

Active Publication Date: 2020-10-27
HARBIN ENG UNIV
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Problems solved by technology

However, the algorithm only simulates part of the temperature range for gray body materials

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  • A four-spectrum turbine blade radiation temperature measurement method
  • A four-spectrum turbine blade radiation temperature measurement method
  • A four-spectrum turbine blade radiation temperature measurement method

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Embodiment Construction

[0048] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0049]The four-spectral radiation temperature measurement method proposed by the present invention also belongs to the multi-spectral radiation temperature measurement method, which selects several ideal channels to measure the temperature of the object surface and participates in subsequent processing calculations. For the problem of radiation energy, only when selecting the channel, according to the gas composition of the environment where the object is located, avoid selecting the wavelength within the absorption peak of the ambient gas to ensure that the radiation energy of the object at this wavelength can be completely received by the thermometer . This avoids the problem of previous single-wavelength measurements relying too much on the selected measurement wavelength.

[0050] Concrete implementation steps of the present inve...

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Abstract

The invention provides a four-spectrum turbine blade radiation temperature measurement method, comprising: obtaining a voltage-temperature curve through calibration of a pyrometer, and calibrating the pyrometer used. The radiant energy on the surface of the working turbine blade is measured to obtain the radiant energy in four different spectral bands. The spectral color temperature under different spectrums is obtained through the electro-optic conversion module, the signal processing module and the data acquisition module for processing. The measurement target has different spectral color temperatures due to the influence of emissivity under different spectra, but the real temperature is the same. A four-spectral radiation model is established according to Planck's formula. According to the radiation model, the objective equation is established to solve the true temperature of the blade. Due to the high speed of the blade and the large amount of online monitoring data, the differential evolution algorithm is selected to solve the true temperature under the premise of ensuring accuracy to improve the calculation speed. The invention realizes more efficient and accurate calculation of the target real temperature, and at the same time satisfies the requirement of online temperature measurement of turbine blades.

Description

technical field [0001] The invention relates to a four-spectrum radiation temperature measurement method, in particular to a four-spectrum radiation temperature measurement method for turbine blades, which is applied to the field of radiation temperature measurement for gas turbine blades. Background technique [0002] The surface temperature of the turbine blade is an important parameter to characterize the working state of the blade. Its accurate measurement is conducive to judging the current working state of the blade, and is of great significance to ensure the normal operation of the gas turbine. The working conditions of the turbine blades are very harsh. At the same time, the design of the turbine blades has a high heating rate. Therefore, at high temperatures, a large temperature gradient will be generated inside the turbine blades, which will cause great thermal stress on the front and rear edges, and thermal stress will occur after repeated actions. Fatigue (low-cy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J5/60G01J5/00
CPCG01J5/00G01J5/0022G01J5/0088G01J5/60G01J5/48
Inventor 高山冯驰陈立伟李东伍迪迟源
Owner HARBIN ENG UNIV
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