Sutton, Gavin; Greenen, Adam; Stanger, Leigh; de Podesta, Michael (2018) The NPL portable standard flame: characterisation of the temperature field above the burner using precision Rayleigh scattering thermometry. NPL Report. ENG 69

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Abstract

Accurate measurement of combustion temperatures can significantly improve engine efficiency and reduce harmful emissions, particularly during the development phase. 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 (typically 5 % -10 % of temperature). This work aims to addresses this by developing a portable flame temperature standard, calibrated via the Rayleigh scattering thermometry technique, traceable to ITS-90. By taking in to account the variation in the differential Rayleigh scattering cross-section with both species and temperature, the post-flame temperature is determined with a relative uncertainty (1σ) of 0.5 %. The long-term reproducibility of the post-flame temperature was 0.2 % over a three month period, demonstrating the suitability of the system as a temperature standard. Additionally, the temperature field above the burner is fully characterised, indicating a uniform region where the temperature varies horizontally and vertically by at most ± 0.5 % and ± 1.0 % respectively for any point within 10 mm of the default measurement position. As the UK's National Measurement Institute, NPL provides calibration and consultation in all aspects of metrology and the standard flame facility should be a welcome addition to the facilities and services it provides.

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	ENG 69
Keywords:	Combustion, Temperature, Standard, Flame, Rayleigh scattering, ITS-90
Subjects:	Engineering Measurements > Thermal
Divisions:	Engineering, Materials & Electrical Science
Last Modified:	25 Jan 2019 14:55
URI:	http://eprintspublications.npl.co.uk/id/eprint/8259

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