Gee, A.J.Proud, D.B.Smith, N.Chinnici, A.Medwell, P.R.2023-07-112023-07-112024International Journal of Hydrogen Energy, 2024; 49(B):59-760360-31991879-3487https://hdl.handle.net/2440/138891Available online 5 July 2023The ability for existing burners to operate safely and efficiently on hydrogen-blended fuels is a primary concern for the many industries looking to adopt hydrogen as an alternative fuel. This study investigates the efficacy of increasing fuel injector diameter as a simple modification strategy to extend the hydrogen-blending limits before flashback. The collateral effects of this modification are quantified with respect to a set of key performance criteria. The results show that the unmodified burner can sustain up to 50 vol% hydrogen addition before flashback. Increasing the fuel injector diameter reduces primary aeration, allowing for stable operation on up to 100% hydrogen. The flame length, visibility and radiant heat transfer properties are all increased as a result of the reduced air entrainment with a trade-off reported for NOx emissions, where, in addition to the effects of hydrogen, reducing air entrainment further increases NOx emissions.en© 2023 The Authors. Published by Elsevier Ltd on behalf of Hydrogen Energy Publications LLC. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).Commercial; Burner; Hydrogen; Fuels; NOxJournal article10.1016/j.ijhydene.2023.06.2302023-07-06648738Gee, A.J. [0000-0003-1926-1983]Proud, D.B. [0000-0002-0351-5718]Smith, N. [0000-0001-8660-2229]Chinnici, A. [0000-0002-0743-3904]Medwell, P.R. [0000-0002-2216-3033]