The low radiant intensity of hydrogen flames may be enhanced by adding biofuels with a high sooting propensity. This paper reports the effect of biofuel concentration and phase on the combustion characteristics of turbulent nonpremixed hydrogen-based flames. The 0.2 and 1 mol% vapourised/spray biofuel surrogates blended flames exhibit limited soot loading, except for 1 mol% spray toluene and anisole blends where soot starts to form. Spray additives benefit the formation of soot by creating localised fuel-rich conditions. Blending 3.5 and 4 mol% vapourised toluene attains a sooting flame and significantly enhances the luminosity and radiant fraction. The global NOx emissions increase with prevapourised/spray biofuel surrogates due to the enhanced NO formation via thermal and prompt routes. Reducing the hydrogen concentration from 9:1 to 7:3 in H2/N2 (by mole) leads to large increases in luminosity and radiant fraction by 34 times and 135%, respectively, and a reduction in NOx emissions by 68%.
|Original language||English (US)|
|Journal||International Journal of Hydrogen Energy|
|State||Published - Apr 6 2023|
Bibliographical noteKAUST Repository Item: Exported on 2023-05-10
Acknowledgements: The research reported in this publication was supported by funding from the University of Adelaide, the Australian Research Council (ARC), and the Future Fuels Cooperative Research Centre (CRC). The assistance with the experimental work from Jason Peak, Kae Ken Foo, Adam John Gee, and Douglas Proud is acknowledged.
ASJC Scopus subject areas
- Energy Engineering and Power Technology
- Condensed Matter Physics
- Fuel Technology
- Renewable Energy, Sustainability and the Environment