Single wavelength and ratio pyrometry reflection errors in temperature measurement of gas turbine blade |
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| Affiliation: | 1. Harbin Engineering University, School of Information and Communication Engineering, No. 145-1, Nantong Street, Harbin 150001, China;2. Harbin Institute of Technology, School of Electrical Engineering and Automation, 92 West Dazhi Street, Harbin 150001, China;1. School of Mechanical Engineering, Tongji University, 48000 Cao An Road, 201804 Shanghai, PR China;2. Mechanical Engineering Department, Politecnico di Milano, Via La Masa 1, 20156 Milan, Italy;3. Manufacturing Metrology Team, Faculty of Engineering, The University of Nottingham, NG7 2RD Nottingham, UK;1. Posgrado en Física de Materiales, Centro de investigación científica y de estudios superiores de Ensenada, Carretera Ensenada-Tijuana 3918, Zona Playitas, 22860 Ensenada, B.C., Mexico;2. Universidad Autónoma de Baja California, Instituto de Ingeniería, Calle de la Normal S/N y Blvd. Benito Juárez, Col. Insurgentes Este, Mexicali, B.C., Mexico;3. Universidad Nacional Autónoma de México, Centro de nanociencias y nanotecnología, Carretera Tijuana-Ensenada Km. 107, Pedregal Playitas, 22860 Ensenada, B.C., Mexico;4. Universidad Autónoma de Baja California, Facultad de Ingeniería, Calle de la Normal S/N y Blvd. Benito Juárez, Col. Insurgentes Este, Mexicali, B.C., Mexico;5. Universidad Autónoma de Baja California, Facultad de Ingeniería, Arquitectura y Diseño, Carretera Transpeninsular Ensenada – Tijuana 3917, Zona Playitas, 22860 Ensenada, B.C., Mexico;6. Kharkiv National University of Radioelectronics, Kharkiv, Ukraine;2. China Academy of Safety Science & Technology, Beijing 100029, PR China;1. China Gas Turbine Establishment, JiangyouShichuan 621703, China;2. Northwestern Polytechnical University, Xi,anShanxi 710129, China;1. National Physical Laboratory, Teddington, UK;2. Laboratoire Commun de Métrologie LNE-CNAM, Saint-Denis, France |
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| Abstract: | Radiation thermometers are the instruments most opted for when measuring surface temperatures of high speed rotating parts non-intrusively in many industrial applications. However, reflection of ambient radiation from the measured target goes against the operating principles of most of these thermometers thus introducing errors to the temperature measurements. Reflection errors introduced into single wavelength and ratio pyrometer temperature measurements of a rotating cooled gas turbine blade were investigated in this work through simulation. Errors for the two pyrometers based on varied target surface emissivity, view factor and ambient temperature were calculated. At high ambient temperatures, high view factors and low surface emissivity, errors exceeding 70% and 30% were realized for single wavelength and ratio pyrometers respectively. Thus temperature measured on reflective targets surrounded by surfaces at much higher temperature should be corrected for reflection errors if its reliability is to be guaranteed. |
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| Keywords: | Single wavelength pyrometer Ratio pyrometer Gas turbine blade Reflection error View factor |
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