Application of a High Resolution Turbine Pyrometer to Heavy Duty Gas Turbines

Frank, Stefan; Holt, Tim O.; Eisenlohr, H. H.; Raake, D.

doi:10.1115/2001-gt-0577

Cited by 9 publications

(2 citation statements)

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“…The hightemperature and high-pressure working environment of turbine blades, combined with the high-speed rotation, limit the application of contact-type temperature measurement. Therefore, radiation temperature measurement has been widely used in the field of the temperature measurement of engine turbine blades [3][4][5][6][7]. However, this type of measurement faces significant challenges.…”

Section: Introductionmentioning

confidence: 99%

Turbine Blade Three-Wavelength Radiation Temperature Measurement Method Based on Reflection Error Correction

et al. 2021

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The turbine blade is a key component in an aeroengine. Currently, measuring the turbine blade radiation temperature always requires obtaining the emissivity of the target surface in advance. However, changes in the emissivity and the reflected ambient radiation cause large errors in measurement results. In this paper, a three-wavelength radiation temperature measurement method was developed, without known emissivity, for reflection correction. Firstly, a three-dimensional dynamic reflection model of the turbine blade was established to describe the ambient radiation of the target blade based on the real surface of the engine turbine blade. Secondly, based on the reflection correction model, a three-wavelength radiation temperature measurement algorithm, independent of surface emissivity, was proposed to improve the measurement accuracy of the turbine blade radiation temperature in the engine. Finally, an experimental platform was built to verify the temperature measurement method. Compared with three conventional colorimetric methods, this method achieved an improved performance on blade temperature measurement, demonstrating a decline in the maximum error from 6.09% to 2.13% and in the average error from 2.82% to 1.20%. The proposed method would benefit the accuracy in the high-temperature measurement of turbine blades.

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Section: Introductionmentioning

confidence: 99%

Turbine Blade Three-Wavelength Radiation Temperature Measurement Method Based on Reflection Error Correction

et al. 2021

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“…Accurate measurement of its temperature is quite significant as far as gas turbine blade health monitoring is concerned. Presently, radiation pyrometers are widely used in the temperature measurement of this component [1][2][3][4][5][6]. As a result of the turbine blade operating in an environment of high temper ature, the pyrometer measurement will always be subjected to error caused by reflected radiation from adjacent blades and other hot components; radiation and absorption of high temperature gas as well as the emission angle.…”

Section: Introductionmentioning

confidence: 99%

Study on temperature measurement of gas turbine blade based on analysis of error caused by the reflected radiation and emission angle

Liu

Feng

Gao

et al. 2018

Meas. Sci. Technol.

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Accurate measurement of gas turbine blade temperature is of great significance as far as blade health monitoring is concerned. An important method for measuring this temperature is the use of a radiation pyrometer. In this research, error of the pyrometer caused by reflected radiation from the surfaces surrounding the target and the emission angle of the target was analyzed. Important parameters for this analysis were the view factor between interacting surfaces, spectral directional emissivity, pyrometer operating wavelength and the surface temperature distribution on the blades and the vanes. The interacting surface of the rotor blade and the vane models used were discretized using triangular surface elements from which contour integral was used to calculate the view factor between the surface elements. Spectral directional emissivities were obtained from an experimental setup of Ni based alloy samples. A pyrometer operating wavelength of 1.6 μm was chosen. Computational fluid dynamics software was used to simulate the temperature distribution of the rotor blade and the guide vane based on the actual gas turbine input parameters. Results obtained in this analysis show that temperature error introduced by reflected radiation and emission angle ranges from −23 K to 49 K.

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Temperature Monitoring of Through-Thickness Temperature Gradients in Thermal Barrier Coatings Using Ultrasonic Guided Waves

Yule,

Harris,

Hill

et al. 2024

J Nondestruct Eval

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Ultrasonic guided waves offer a promising method of monitoring the online temperature of plate-like structures in extreme environments, such as aero-engine nozzle guide vanes (NGVs), and can provide the resolution, response rate, and robust operation that is required in aerospace. Previous investigations have shown the potential of such a system but the effect of the complex physical environment on wave propagation is yet to be considered. This article uses a numerical approach to investigate how thermal barrier coatings (TBCs) applied to the surface of many components designed for extreme thermal conditions will affect ultrasonic guided wave propagation, and how a system can be employed to monitor through-thickness temperature changes. The top coat/bond coat boundary in NGVs has been shown to be a temperature critical point that is difficult to monitor with traditional temperature sensors, which highlights the potential of ultrasonic guided waves. Differences in application method and layer thickness are considered, and analysis of through-thickness displacement profiles and dispersion curves are used to predict signal response and determine the most suitable mode of operation. Heat transfer simulations (COMSOL) have been used to predict temperature gradients within a TBC, and dispersion curves have been produced from the temperature dependant material properties. Time dependant simulations of wave propagation are in good agreement with dispersion curve predictions of wave velocity for the two lowest order modes in three thicknesses of TBC top coat (100, 250, and 500 $$\upmu \hbox {m}$$ μ m ). When wave velocity measurements from the simulations are compared to dispersion curves generated at isotropic temperatures, the corresponding temperature represents the average temperature of a gradient system well. Such a measurement system could, in principle, be used in conjunction with surface temperature measurement systems to monitor through-thickness temperature changes.

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Application of a High Resolution Turbine Pyrometer to Heavy Duty Gas Turbines

Cited by 9 publications

References 0 publications

Turbine Blade Three-Wavelength Radiation Temperature Measurement Method Based on Reflection Error Correction

Turbine Blade Three-Wavelength Radiation Temperature Measurement Method Based on Reflection Error Correction

Study on temperature measurement of gas turbine blade based on analysis of error caused by the reflected radiation and emission angle

Temperature Monitoring of Through-Thickness Temperature Gradients in Thermal Barrier Coatings Using Ultrasonic Guided Waves

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