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Validation of Emission Spectroscopy Gas Temperature Measurements Using a Standard Flame Traceable to the International Temperature Scale of 1990 (ITS-90)

Sutton, G; Fateev, A; Rodríguez-Conejo, M A; Meléndez, J; Guarnizo, G (2019) Validation of Emission Spectroscopy Gas Temperature Measurements Using a Standard Flame Traceable to the International Temperature Scale of 1990 (ITS-90). International Journal of Thermophysics, 40 (11). 99 ISSN 0195-928X

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Abstract

Accurate measurement of post-flame temperatures can significantly improve combustion efficiency and reduce harmful emissions, for example, during the development phase of new internal combustion engines and gas-turbine combustors. Non-perturbing optical diagnostic techniques are capable of measuring temperatures in such environments but are often technically complex and validation is challenging, with correspondingly large uncertainties, often as large as 5 % - 10 % of temperature. This work aims to reduce these uncertainties by developing a portable flame temperature standard, calibrated via the Rayleigh scattering thermometry technique, traceable to ITS-90, with an uncertainty of 0.5 % of temperature (k = 1). By suitable burner selection and accurate gas flow control, a stable, square, flat flame with uniform post-flame species and temperature is realised. Following development, the standard flame is used to validate two IR emission spectroscopy systems, both measuring the line-integrated emission spectra in the post-flame region. The first utilises a Hyperspectral imaging FTIR spectrometer capable of measuring 2D species and temperature maps and the second, a high-precision single line of sight FTIR spectrometer. In the central post-flame region, the agreement between the Rayleigh and FTIR temperatures is within the combined measurement uncertainties and amounts to 1 % (k = 1) of temperature.

Item Type: Article
Keywords: Combustion, Temperature, Standard, Flame, Emission spectroscopy, Rayleigh scattering, ITS-90
Subjects: Engineering Measurements > Thermal
Divisions: Engineering
Identification number/DOI: 10.1007/s10765-019-2557-6
Last Modified: 22 May 2020 13:11
URI: http://eprintspublications.npl.co.uk/id/eprint/8673

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