Further Reading


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To understand the different components and industries Thermal History Paints and Sensors are used on, visit our Industrial Applications section Some of these projects are summarised as Case Studies

More technical detail and measurement analysis can be found in our publications.

Publications

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Surface temperature measurements in an industrial gas turbine using thermal history paints (2017)

  • Surface temperature measurements in an industrial gas turbine using thermal history paints (2017)
  • In collaboration with MAN Diesel & Turbo
  • The paper describes the first application of THP in an extended, rather than dedicated, engine test in which components in both the hot gas path and the secondary air system were coated with THP. During the test campaign the engine components operated below maximum temperature for extended periods of time, which required a novel approach to the calibration of the paint. An overview over the correspondence between the temperatures measured with the THP, thermal paints and CFD calculations is provided for a sideplate and turbine blade. There is very good correlation between the results of the different methods. For the sideplate, the temperature measured with the THP was within 10K of the CFD calculation. Furthermore, the THP exhibited only minor erosion damage after over 50 hours of engine testing. The high durability and measurement accuracy demonstrate the feasibility of using the THP in extended engine tests.
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Accelerated thermal profiling of gas turbine components using luminescent thermal history paints (2017)

  • Presented at the conference: 1st Global Power and Propulsion Forum in Zurich, Switzerland in January 2017
  • In collaboration with VZLU – Aerospace Research and Test Establishment
  • This paper describes the underlying principles behind Thermal History Paints and the advantages it provides over existing methods. The benefits are demonstrated through measurements on nozzle guide vanes, with the view to compare and validate them against thermocouple measurements. The results show that the THP extends the limited information from thermocouples to provide a more complete view of the thermal processes on the component
  • See relevant Case Study
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Validation of Surface Temperature Measurements on a Combustor Liner Under Full-Load Conditions Using a Novel Thermal History Paint (2016)

  • Presented at the conference: ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition in Seoul, South Korea in June 2016
  • Also published in the Journal of Engineering for Gas Turbines and Power
  • In collaboration with MAN Turbo and Diesel
  • This paper describes a test in which THP was applied to a front panel from a combustor of an industrial gas turbine. Since this component sees a wide range of temperatures, it is ideally suited for the testing of the measurement techniques under real engine conditions. The durability and temperature results of THP, traditional thermal paints and thermocouples are discussed. The results demonstrate the benefits of THPs as a new temperature profiling technique. It is shown that the THP exhibited greater durability compared to the conventional thermal paint. Furthermore, the new technology provided detailed measurements down to millimeters indicating local temperature variations and global variations over the complete component
further-reading7

Luminescent Thermal History Sensors: Fundamentals and Applications for Thermal Profiling (2015)

  • Presented at the conference: Symposium on Test Cell and Controls Instrumentation and EHM Technologies for Military Air, Land and Sea Turbine Engines in Rzeszow, Poland in April 2015
  • THP was used to determine the operating surface temperature of a turbocharger used in an automotive diesel engine. The use of Thermal History Paints proved successful, and readings with good repeatability were obtained. The technique relayed results even in areas with reduced coating thickness given the high rotational speeds of 180,000 RPM. There was good agreement between the results and the predicted operating temperature and temperature differences along the length of the blades can be resolved.

Off-Line Temperature Profiling Utilizing Phosphorescent Thermal History Paints and Coatings (2015)

  • Article in Journal of Turbomachinery 137(10)
  • This paper reviews results from temperature measurements made with a water-based paint for the temperature range 100–800 °C in controlled conditions. Repeatability of the tests and errors are discussed. Further, some measurements are carried out using an electronic hand-held interrogation device which can scan a component surface and provide a spatial resolution of below 3 mm. The instrument enables mobile measurements outside of laboratory conditions. Further, a robust thermal history coating is introduced demonstrating the capability of the coating to withstand long term exposures. The coating is based on thermal barrier coating (TBC) architecture with a high temperature bondcoat and deposited using an air plasma spray process to manufacture a reliable long lasting coating. Such a coating could be employed over the life of the component to provide critical temperature information at regular maintenance intervals for example indicating hot spots on engine parts

On-Line Temperature Measurement Inside a Thermal Barrier Sensor Coating During Engine Operation (2015)

  • Article in Journal of Turbomachinery 137(10)

Thermal history paints – principals and progress (2014)

  • Conference: The 60th International Instrumentation Symposium, At London

Off-Line Temperature Profiling Utilizing Phosphorescent Thermal History Paints and Coatings (2014)

  • Conference Paper in Journal of Turbomachinery 137(10), presented at ASME Turbo Expo 2014

More publications can be found in Research Gate.