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Effect of pyrometer type and wavelength selection on temperature measurement errors for turbine blades.

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Title: Effect of pyrometer type and wavelength selection on temperature measurement errors for turbine blades.
Authors: Li, Dong1, Feng, Chi1, Gao, Shan1 gaoshan08@hrbeu.edu.cn, Daniel, Ketui1, Chen, Liwei1
Source: Infrared Physics & Technology. Nov2018, Vol. 94, p255-262. 8p.
Subjects: Optical pyrometers, Gas turbine blades, Temperature measurements, Wavelengths, Emissivity, Emissivity measurement, Computational fluid dynamics, Discretization methods
Abstract: Highlights • Error of different kinds of radiant pyrometer were investigated. • Emissivity of gas turbine blade material in near-infrared was investigated. • An accurate reflection model was established. Abstract Turbine blade temperature measurements are important for monitoring the working state of the blades. However, the reflected radiation from the high temperature surrounding environment leads to significant error in the optical pyrometer measurements. This study calculates and compares temperature error of single wavelength pyrometer, ratio pyrometer and multicolor pyrometer in measuring turbine rotor blade temperature. Emissivity of the blade was measured in the wavelength range of 1.2 μm to 2.5 μm. Temperature distribution of the rotor blade and the guide vane was simulated by CFD software. Additionally, temperature error was calculated based on - discretization of a three-dimensional blade model. The results show that from the leading edge to the trailing edge of the rotor blade pressure side, the variation trend of the three kinds of pyrometer temperature error is the same, first decreasing, then increasing before decreasing again. The maximum relative temperature error was found to be 7.5%, 4.9% and 2.6% when the wavelength of the pyrometer was 1.3 μm, 1.6 μm, 2.2 μm, respectively. The study also shows that wavelength selection has great influence on the ratio pyrometer. It was found that the maximum relative temperature error ranged from 2.6% to 15.7% based on the choice of the various wavelengths. On the other hand, the maximum relative temperature error of the multicolor pyrometer was 3.8%. The analysis presented in this work will be of importance in providing guidelines for choosing the optimum measurement wavelengths for optical pyrometers. Furthermore, the finding will also useful in the calculation and correction of the optical pyrometer error. [ABSTRACT FROM AUTHOR]
Copyright of Infrared Physics & Technology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 132425385
AccessLevel: 6
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PubTypeId: academicJournal
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  Label: Title
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  Data: Effect of pyrometer type and wavelength selection on temperature measurement errors for turbine blades.
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  Data: <searchLink fieldCode="AR" term="%22Li%2C+Dong%22">Li, Dong</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Feng%2C+Chi%22">Feng, Chi</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Gao%2C+Shan%22">Gao, Shan</searchLink><relatesTo>1</relatesTo><i> gaoshan08@hrbeu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Daniel%2C+Ketui%22">Daniel, Ketui</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Chen%2C+Liwei%22">Chen, Liwei</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Infrared+Physics+%26+Technology%22">Infrared Physics & Technology</searchLink>. Nov2018, Vol. 94, p255-262. 8p.
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  Data: <searchLink fieldCode="DE" term="%22Optical+pyrometers%22">Optical pyrometers</searchLink><br /><searchLink fieldCode="DE" term="%22Gas+turbine+blades%22">Gas turbine blades</searchLink><br /><searchLink fieldCode="DE" term="%22Temperature+measurements%22">Temperature measurements</searchLink><br /><searchLink fieldCode="DE" term="%22Wavelengths%22">Wavelengths</searchLink><br /><searchLink fieldCode="DE" term="%22Emissivity%22">Emissivity</searchLink><br /><searchLink fieldCode="DE" term="%22Emissivity+measurement%22">Emissivity measurement</searchLink><br /><searchLink fieldCode="DE" term="%22Computational+fluid+dynamics%22">Computational fluid dynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Discretization+methods%22">Discretization methods</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Highlights • Error of different kinds of radiant pyrometer were investigated. • Emissivity of gas turbine blade material in near-infrared was investigated. • An accurate reflection model was established. Abstract Turbine blade temperature measurements are important for monitoring the working state of the blades. However, the reflected radiation from the high temperature surrounding environment leads to significant error in the optical pyrometer measurements. This study calculates and compares temperature error of single wavelength pyrometer, ratio pyrometer and multicolor pyrometer in measuring turbine rotor blade temperature. Emissivity of the blade was measured in the wavelength range of 1.2 μm to 2.5 μm. Temperature distribution of the rotor blade and the guide vane was simulated by CFD software. Additionally, temperature error was calculated based on - discretization of a three-dimensional blade model. The results show that from the leading edge to the trailing edge of the rotor blade pressure side, the variation trend of the three kinds of pyrometer temperature error is the same, first decreasing, then increasing before decreasing again. The maximum relative temperature error was found to be 7.5%, 4.9% and 2.6% when the wavelength of the pyrometer was 1.3 μm, 1.6 μm, 2.2 μm, respectively. The study also shows that wavelength selection has great influence on the ratio pyrometer. It was found that the maximum relative temperature error ranged from 2.6% to 15.7% based on the choice of the various wavelengths. On the other hand, the maximum relative temperature error of the multicolor pyrometer was 3.8%. The analysis presented in this work will be of importance in providing guidelines for choosing the optimum measurement wavelengths for optical pyrometers. Furthermore, the finding will also useful in the calculation and correction of the optical pyrometer error. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Infrared Physics & Technology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.infrared.2018.09.004
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 8
        StartPage: 255
    Subjects:
      – SubjectFull: Optical pyrometers
        Type: general
      – SubjectFull: Gas turbine blades
        Type: general
      – SubjectFull: Temperature measurements
        Type: general
      – SubjectFull: Wavelengths
        Type: general
      – SubjectFull: Emissivity
        Type: general
      – SubjectFull: Emissivity measurement
        Type: general
      – SubjectFull: Computational fluid dynamics
        Type: general
      – SubjectFull: Discretization methods
        Type: general
    Titles:
      – TitleFull: Effect of pyrometer type and wavelength selection on temperature measurement errors for turbine blades.
        Type: main
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            NameFull: Li, Dong
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            NameFull: Feng, Chi
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            NameFull: Gao, Shan
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            NameFull: Daniel, Ketui
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            NameFull: Chen, Liwei
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            – D: 01
              M: 11
              Text: Nov2018
              Type: published
              Y: 2018
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              Value: 13504495
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              Value: 94
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            – TitleFull: Infrared Physics & Technology
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