Precision Temperature Detection Using a Phosphorescence Sensor Coating System on a Rolls-Royce Viper Engine

Feist, J. P.; Sollazzo, P. Y.; Berthier, S.; Charnley, B.; Wells, J.

doi:10.1115/gt2012-69779

Cited by 12 publications

(9 citation statements)

References 5 publications

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“…The flattening of the curve at around 850°C is due to the electronics of the collection system and results in a reduced precision for measurements above this temperature. However, the temperatures of interest in this study and in the previous application of the sensor [13][14][15][16] are located in the steepest part of the curve as shown in Figure 2. …”

Section: Phosphorescence Calibrationmentioning

confidence: 98%

“…The temperatures measured in the application of the TBC system in a Rolls-Royce jet engine [13][14][15][16] ranged from 500°C to about 650°C. The curve was obtained from over 500 data points, each consisting of 50 averaged single decays, recorded during the cooling down of the sample inside the furnace.…”

Section: Phosphorescence Calibrationmentioning

confidence: 99%

“…Yttria stabilized zirconia (YSZ) is commonly used as a top layer of a TBC system and has become the industry standard. This material has been reported as a thermal sensor when doped with the rare earths Eu and Dy [7,10,12], and successfully used when integrated into a measurement system on a Rolls-Royce Viper engine to measure temperatures with an estimated precision of 5°C [13][14][15][16].…”

Section: Introductionmentioning

confidence: 98%

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Temperature Sensing inside Thermal Barrier Coatings using Phosphor Thermometry

González

Pilgrim

Sollazzo

et al. 2014

IET &Amp; ISA 60th International Instrumentation Symposium 2014

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By introducing a few percent of rare earth oxides into existing Thermal Barrier Coating (TBC) materials, their functionality can be enhanced. The low fraction of the rare earth means the primary function of the coating as a thermal barrier can be maintained. However, it provides additional sensing capabilities. Embedded in the crystal, the rare earth ions act as optical centres making the material phosphorescent. The properties of the phosphorescence depend on temperature, among other parameters, such that the functional coating can be used to conduct phosphor thermometry. Accordingly, the temperature of the coating can be measured by exciting and detecting the phosphorescence from the coating. This technique has been under investigation for many years, although was only recently demonstrated on an operating gas turbine engine. Implementation of a phosphorescent measurement system was carried out in a Rolls-Royce jet engine using dysprosium doped yttrium stabilised zirconia as a sensor. During this implementation, a thermal gradient across the ceramic coating of some components of the engine existed due to cooling effects. This paper complements the previous work by investigating the effect on the temperature measurements accuracy of this thermal gradient.TBCs are translucent therefore the excitation light is expected to penetrate through the coating causing the phosphorescent response to be an integrated signal. When the thermal gradient through the coating thickness is significant relative to the measurement accuracy of the system then it might introduce ambiguity in the measurement. Therefore, the effect of the gradient must be considered independently. The focus of the current contribution is on the interpretation of temperature measurements from phosphorescent TBCs in a thermal gradient, such as those in the engine test. For the study, a specialised cyclic thermal gradient burner test rig was operated using equivalent instrumentation to that used for the engine test. This unique rig enables the controlled heating of the coatings at different temperature regimes. A longwavelength pyrometer was employed to detect the surface temperature of the coating. A correction was applied to compensate for changes in emissivity using two methods. A thermocouple was continuously used to measure the substrate temperature of the sample. Typical gradients across the coating are less than 1K/μm.The study successfully proved that the temperature indication from the phosphorescent TBC remains between the surface and substrate temperature for all operating conditions. This demonstrates the possibility of measuring inside the coating closer to the bond coat, using a fully doped coating to maintain signal strength.

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Section: Phosphorescence Calibrationmentioning

confidence: 98%

Section: Phosphorescence Calibrationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

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Temperature Sensing inside Thermal Barrier Coatings using Phosphor Thermometry

González

Pilgrim

Sollazzo

et al. 2014

IET &Amp; ISA 60th International Instrumentation Symposium 2014

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show abstract

“…Pyrometry and infrared thermography are good methods to detect creep, low-cycle fatigue, corrosion, erosion and oxidation [87,182]. Phosphor thermometry is able to identify failures such as cracks, erosion, corrosion and wear [183]. These techniques will be presented in detail in the next chapters.…”

Section: Hot Gas Component Monitoringmentioning

confidence: 99%

“…Feist et al showed in different publications the industrial application of phosphor thermometry. To develop these special paintings a Rolls-Royce jet engine was used for verification [183,200,201,202,203,204]. The application in an industrial gas turbine was proven as well.…”

Section: Hot Gas Component Monitoringmentioning

confidence: 99%

A Review of NDT/Structural Health Monitoring Techniques for Hot Gas Components in Gas Turbines

Mevissen

Meo

2019

Sensors

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The need for non-destructive testing/structural health monitoring (SHM) is becoming increasingly important for gas turbine manufacturers. Incipient cracks have to be detected before catastrophic events occur. With respect to condition-based maintenance, the complex and expensive parts should be used as long as their performance or integrity is not compromised. In this study, the main failure modes of turbines are reported. In particular, we focus on the turbine blades, turbine vanes and the transition ducts of the combustion chambers. The existing monitoring techniques for these components, with their own particular advantages and disadvantages, are summarised in this review. In addition to the vibrational approach, tip timing technology is the most used technique for blade monitoring. Several sensor types are appropriate for the extreme conditions in a gas turbine, but besides tip timing, other technologies are also very promising for future NDT/SHM applications. For static parts, like turbine vanes and the transition ducts of the combustion chambers, different monitoring possibilities are identified and discussed.

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Transient Thermal Mapping Utilizing the Sintering of Glass‐Ceramics

Burke,

Gregory

2024

Adv Eng Mater

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Thermal paints are essential for mapping the surface temperature of gas turbine engine components but can only indicate maximum temperature. A novel transient thermal history sensor that combines the capabilities of a thermocouple with those of a thermal paint is developed here, enabling the retrieval of full thermal history using a “sintering” model. The glassy ceramic thermal paint undergoes a qualitative optical transition due to sintering in response to temperature that is quantified using UV–vis spectroscopy. This provides high‐resolution transient temperature measurement (±6 °C) when maximum temperature is above its glass transition temperature (Tg) of 563 °C and up to 660 °C. The glass‐ceramic coating exhibits strong adhesion to Inconel 718 substrates due to matched coefficients of thermal expansion. By fabricating similar paints with distinct temperature ranges and placing them in proximity, this approach can significantly reduce the number of thermocouples needed for surface temperature mapping, thereby improving the accuracy of measurements required for engine validation.

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Precision Temperature Detection Using a Phosphorescence Sensor Coating System on a Rolls-Royce Viper Engine

Cited by 12 publications

References 5 publications

Temperature Sensing inside Thermal Barrier Coatings using Phosphor Thermometry

Temperature Sensing inside Thermal Barrier Coatings using Phosphor Thermometry

A Review of NDT/Structural Health Monitoring Techniques for Hot Gas Components in Gas Turbines

Transient Thermal Mapping Utilizing the Sintering of Glass‐Ceramics

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