Four-spectrum turbine blade radiation temperature measurement method

A technology of turbine blade and radiation temperature measurement, applied in optical radiation measurement, radiation pyrometry, temperature recording method, etc., to meet the effect of online temperature measurement

Active Publication Date: 2018-11-13
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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  • Four-spectrum turbine blade radiation temperature measurement method
  • Four-spectrum turbine blade radiation temperature measurement method
  • 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. The method includes: acquiring a voltage-temperature curve through pyrometer calibration, and calibratinga user pyrometer; measuring the radiation energy on the surface of a working turbine blade to acquire the radiation energy of four different spectrum sections; processing with a photoelectric conversion module, a signal processing module and a data collecting module to obtain spectrum color temperature under different spectrum; according to the fact that the spectrum color temperature of a measuring target under different spectrum is different due to the influence of emissivity, but the real temperature of the measuring target under different spectrum is identical, building a four-spectrum radiation model according to a Planck formula; building a target equation according to the radiation model to solve the real temperature of the blade, wherein due to the fact that the blade is high in rotation speed and large in online monitoring quantity, a differential evolution algorithm is selected to solve the real temperature under the premise that precision is guaranteed so as to increase calculation speed. By the method, the real temperature of the target can be effectively and accurately calculated, and the online temperature measuring requirements of the turbine blade are satisfied.

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...

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Application Information

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Patent Type & Authority Applications(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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