Functional Validation of K-Type (NiCr-NiMn) Thin Film Thermocouple on Low Pressure Turbine Nozzle Guide Vane (LPT NGV) of Gas Turbine Engine

Satish, T.; RAKESH, KUMAR; Uma, G.; Umapathy, M.; Chandrasekhar, U.; Rao, A. N. Vishwanatha; Petley, Vijay

doi:10.1007/s40799-016-0162-1

Cited by 18 publications

(11 citation statements)

References 13 publications

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“…The addition of Al 2 O 3 to YSZ(yttria-stabilized zirconia)-based TBCs improves their electrical insulation above 400 • C which allows TFTCs to be used effectively [43]. A summary of THTC systems is given by Satish et al [44] along with the implementation of a K-type TFTC on an NGV deposited using an E-beam evaporation technique. Two methods of measuring temperature distribution on a TBC coating are given by Z. Ji et al [45] whereby Pt soldering dots are placed along a PtRH thin film.…”

Section: Thermocouplesmentioning

confidence: 99%

Surface temperature condition monitoring methods for aerospace turbomachinery: exploring the use of ultrasonic guided waves

Yule

Zaghari

Harris

et al. 2021

Meas. Sci. Technol.

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Turbine blades and nozzle guide vanes (NGVs) are operated at extreme temperatures in order to maximise thermal efficiency and power output of an engine. In this paper the suitability of existing temperature monitoring systems for turbine blades and nozzle guide vanes are reviewed. Both offline and online methods are presented and their advantages and disadvantages are examined. The use of offline systems is well established but their online equivalents are difficult to implement because of the limited access to components. There is the need for an improved sensor that is capable of measuring temperature in real time with minimum interference to the operating conditions of the engine, allowing operating temperatures to be increased to the limits of the components and maximising efficiency. Acoustic monitoring techniques are already used for a large number of structural health monitoring applications and have the potential to be adapted for use in temperature monitoring for turbine blades and NGVs. High temperatures severely affect the response of ultrasonic transducers. However, waveguides and buffer rods can be used to distance transducers from extreme conditions, while piezoelectric materials such as Yttrium Calcium Oxyborate single crystals and Aluminum Nitride have been developed for use at high temperatures. A new monitoring approach based on ultrasonic guided waves is introduced in this paper. The geometry of turbine blades and NGVs allows Lamb waves to propagate through their structure, and the presence of numerous cooling holes will produce acoustic reflections that can be utilised for monitoring temperature at a number of locations. The dispersive nature of Lamb waves makes their analysis difficult; however, wave velocity in dispersive regions is particularly sensitive to changes in temperature and could be utilised for monitoring purposes. The proposed method has the potential to provide high resolution and accuracy, fast response times, and the ability to place sensors outside of the gas path. Further research is required to develop a monitoring system based on the use of guided waves in extreme environments.

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Section: Thermocouplesmentioning

confidence: 99%

Surface temperature condition monitoring methods for aerospace turbomachinery: exploring the use of ultrasonic guided waves

Yule

Zaghari

Harris

et al. 2021

Meas. Sci. Technol.

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“…Temperature monitoring for critical components of aero-engines and hypersonic vehicles is fundamental to their optimal design, ground testing, and operational status assessment. Existing proven discrete temperature measurement devices can damage the part to be measured, interfere with the flow field of the structure, and pose severe aerodynamic problems. − The thin-film sensor is an ideal solution to this problem. It has a low mass/size ratio and can be fabricated in situ.…”

Section: Introductionmentioning

confidence: 99%

Rapid Printing of High-Temperature Polymer-Derived Ceramic Composite Thin-Film Thermistor with Laser Pyrolysis

Tang

et al. 2023

ACS Appl. Mater. Interfaces

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Polymer-derived ceramic (PDC)-based high-temperature thin-film sensors (HTTFSs) exhibit promising applications in the condition monitoring of critical components in aerospace. However, fabricating PDC-based HTTFS integrated with high-efficiency, high-temperature anti-oxidation, and customized patterns remains challenging. In this work, we introduce a rapid and flexible selecting laser pyrolysis combined with a direct ink writing process to print double-layer high-temperature antioxidant PDC composite thin-film thermistors under ambient conditions. The sensitive layer (SL) was directly written on an insulating substrate with excellent conductivity by laser-induced graphitization. Then, the antioxidant layer (AOL) was written on the surface of the SL to realize the integrated manufacturing of double-functional layers. Through characterization analysis, it was shown that B2O3 and SiO2 glass phases generated by the PDC composite AOL could effectively prevent oxygen intrusion. Therefore, the fabricated PDC composite thermistors exhibited a negative temperature coefficient in the temperature range from 100 to 1100 °C and high repeatability below 800 °C. Meanwhile, it has excellent high-temperature stability at 800 °C with a resistance change of only 2.4% in 2 h. Furthermore, the high-temperature electrical behavior of the thermistor was analyzed. The temperature dependence of the conductivity for this thermistor has shown an agreement with the Mott’s variable range hopping mechanism. Additionally, the thermistor was fabricated on the surface of an aero-engine blade to verify its feasibility below 800 °C, showing the great potential of this work for state sensing on the surface of high-temperature components, especially for customized requirements.

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“…In 2015, Sonker et al [ 12 , 13 ] of the Indian Institute of Technology, studied ultra-high temperature thin-film thermocouples based on this, which can be used in the maximum temperature range of 2900 K, and can be used to measure the heat flux of the missile and the gas flow through the nozzle. In 2016, Satish et al [ 14 ] conducted basic experiments and proof-of-concept studies on a thin-film thermocouple deposited by the electron beam evaporation process. Its Seebeck coefficient was 42 μV/°C, and its time constant was 1.11784 ms.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Calibration of Pt-Rh10/Pt Thin-Film Thermocouple

Lin

Zhang

et al. 2022

Micromachines

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Aiming at the dynamic testing of the ignition temperature of micro-initiating explosives, a novel Pt-Rh10/Pt thin-film thermocouple was designed in this paper. The author carried out the preparation of the thermocouple by using a screen printing process on an Al2O3 ceramic substrate. The formed thermocouple was made of Pt-Rh10 wire and Pt wire as compensation wires, with a size of ≤ 1 mm and a thickness of about 6 μm. In the testing process, the static calibration of the thermocouple at 50~600 °C and 650~1500 °C was completed by a portable temperature verification furnace and a horizontal high temperature verification furnace, and the results showed that the Seebeck coefficient of the thermocouple was about 10.70 μV/°C, and its output voltage–temperature curve was similar to that of a standard S-type thermocouple, which achieved the effective temperature measurement up to 1500 °C. The dynamic response of Pt-Rh10/Pt thin-film thermocouple was then tested and studied using the pulsed laser method, and the results show that the time constant of the thermocouple prepared in this paper is about 535 μs, which has the characteristics of fast response and high precision high-temperature testing. Compared with the traditional thin-film thermocouple, the thermocouple has excellent electrical conductivity, more oxidation resistance, the surface layer is not easy to peel off and other advantages.

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Functional Validation of K-Type (NiCr-NiMn) Thin Film Thermocouple on Low Pressure Turbine Nozzle Guide Vane (LPT NGV) of Gas Turbine Engine

Cited by 18 publications

References 13 publications

Surface temperature condition monitoring methods for aerospace turbomachinery: exploring the use of ultrasonic guided waves

Surface temperature condition monitoring methods for aerospace turbomachinery: exploring the use of ultrasonic guided waves

Rapid Printing of High-Temperature Polymer-Derived Ceramic Composite Thin-Film Thermistor with Laser Pyrolysis

Fabrication and Calibration of Pt-Rh10/Pt Thin-Film Thermocouple

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