Spatial temperature measurements in a swirl-stabilized hydrogen-air diffusion flame at elevated pressure using laser-induced grating spectroscopy

Chaib, Oussama, Weller, Lee, Giles, Anthony ORCID: https://orcid.org/0000-0002-1221-5987, Morris, Steven ORCID: https://orcid.org/0000-0001-5865-8911, Williams, Benjamin A.O. and Hochgreb, Simone 2024. Spatial temperature measurements in a swirl-stabilized hydrogen-air diffusion flame at elevated pressure using laser-induced grating spectroscopy. Journal of Engineering for Gas Turbines and Power 146 (11) , 111020. 10.1115/1.4065996

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Abstract

Laser-induced grating spectroscopy (LIGS) is applied, for the first time, to a swirling non-premixed hydrogen-air flame in a high-pressure combustion facility. A portable LIGS unit is used to probe 35 different axial and radial locations in the flame and a new conditioned processing approach based on laminar flame simulation is introduced to infer temperatures from instantaneous LIGS spectra. Thermal and electrostrictive frequencies are used to produce a spatial map of temperatures in the combustor. Temperatures up to 2500 K are measured in this work, which constitute the highest temperatures ever measured using LIGS. Challenges associated with the deployment of the technique in turbulent stratified hydrogen flames are discussed, as are potential measures to overcome them, including the use of data-driven clustering techniques.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Publisher:	American Society of Mechanical Engineers
ISSN:	0742-4795
Date of First Compliant Deposit:	6 August 2024
Date of Acceptance:	11 July 2024
Last Modified:	08 Nov 2024 11:00
URI:	https://orca.cardiff.ac.uk/id/eprint/171119

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