Pyrometry for turbine blade development

Suarez, E.; Przirembel, H. R.

doi:10.2514/3.23259

Cited by 21 publications

(7 citation statements)

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“…8 Voigt et al, on the other hand, established the error function on the basis of reflection, wavelength, target temperature, and ambient temperature to reduce the influence of radiation reflection. Suarez and Przirembel, for instance, used a double spectral calibration method to subtract the reflected component from the total radiation in order to obtain more accurate measurement results.…”

Section: Environmental Influencesmentioning

confidence: 99%

Monitoring temperature for gas turbine blade: correction of reflection model

et al. 2015

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For a gas turbine blade working in a narrow space, the accuracy of blade temperature measurements is greatly impacted by environmental irradiation. A reflection model is established by using discrete irregular surfaces to calculate the angle factor between the blade surface and the hot adjacent parts. The model is based on the rotational angles and positions of the blades, and can correct for measurement error caused by background radiation when the blade is located at different rotational positions. This method reduces the impact of reflected radiation on the basis of the turbine's known geometry and the physical properties of the material. The experimental results show that when the blade temperature is 911.2 AE 5 K and the vane temperature ranges from 1011.3 to 1065.8 K, the error decreases from 4.21 to 0.75%.

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Section: Environmental Influencesmentioning

confidence: 99%

Monitoring temperature for gas turbine blade: correction of reflection model

et al. 2015

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“…In previous research, the problem of reflection from the high-temperature environment was solved by employing either a long-wavelength pyrometer [13] or the dual spectral area pyrometry (DSAP) method [14] to reduce the impact. In this study, the discretization model method was used.…”

Section: Impact Of High-temperature Ambient Reflectionmentioning

confidence: 99%

Analysis and improvement of gas turbine blade temperature measurement error

Gao

Wang

Feng

et al. 2015

Meas. Sci. Technol.

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Gas turbine blade components are easily damaged; they also operate in harsh high-temperature, high-pressure environments over extended durations. Therefore, ensuring that the blade temperature remains within the design limits is very important. In this study, measurement errors in turbine blade temperatures were analyzed, taking into account detector lens contamination, the reflection of environmental energy from the target surface, the effects of the combustion gas, and the emissivity of the blade surface. In this paper, each of the above sources of measurement error is discussed, and an iterative computing method for calculating blade temperature is proposed.

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“…Traditional diagnostic techniques for measuring combustor wall temperatures in turbine engines include thermocouples [6][7][8], thermal wall paints [9,10], pyrometry [11][12][13], and phosphors [14,15]. Thermocouples have the following limitations: intrusiveness, airflow disruption of an engine, producing inaccurate measurements, fragility owing to tight geometry that causes breakage during combustor rig tests, pointbased measurement that requires multiple thermocouples for two-dimensional (2D) measurements (low spatial resolution), non-reusability because it requires high-temperature ceramic adhesive to attach to the target, inability to account for radiative heat losses at high temperatures, and limited operation range.…”

Section: Introductionmentioning

confidence: 99%

A compact LWIR borescope sensor for 2D engine component surface temperature measurement

Hsu

Chen

Roy

et al. 2023

Meas. Sci. Technol.

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A compact long-wavelength infrared (LWIR) borescope imaging sensor operating in the wavelength range of 8–14 μm is designed and developed for non-contact two-dimensional (2D) surface temperature measurements in gas-turbine engines. The LWIR detection minimizes optical interferences from hot combustion gases and soot (emission within UV-Mid IR region). Using simulations, the system is optimized for improving the signal collection efficiency and minimize image aberrations. The LWIR borescope probe is shielded by the custom-build compact water-cooled probe housing (OD 19 mm, ID 10 mm), which can sustain flame temperature up to 2400 K at a pressure of 50 bar. It facilitates long-term optical diagnostics inside the actual high-pressure combustion facilities where extreme thermal acoustic perturbation and intense heat fluxes are encountered. The design, construction, and characterization of the LWIR borescope sensor are discussed in detail. We present the 2D surface temperature measurements of a V-gutter bluff-body with simple nitrogen gas cooling in a laboratory testbed. The results indicate the sensor’s ability to accurately measure surface temperature with low background noise and to track transient cooling effect. The water-cooled probe housing was tested to verify the effectiveness of fast heat dissipation in high-temperature combustion environment to avoid unwanted thermal signals from the LWIR probe window. The developed LWIR sensor suite has promising applications in surface temperature measurements of engine components. The findings of this study may aid propulsion system engineers and researchers in designing thermal management systems and optimizing operation.

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Pyrometry for turbine blade development

Cited by 21 publications

References 0 publications

Monitoring temperature for gas turbine blade: correction of reflection model

Monitoring temperature for gas turbine blade: correction of reflection model

Analysis and improvement of gas turbine blade temperature measurement error

A compact LWIR borescope sensor for 2D engine component surface temperature measurement

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