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Premixed Hydrogen Flames


Research Highlights

Freely Propagating Hydrogen Flames

Freely Propagating Hydrogen-Methane Flames

Turbulence-Flame Interactions in Lean Premixed Hydrogen Flames


Freely Propagating Hydrogen Flames

Freely-propagating lean premixed hydrogen flames spontaneously develop into the well-known cellular burning structures, where the fuel consumption and heat release are highly variable along the flame surface.

The instabilities at play in this system saturate quickly and result in robust, slowly evolving cellular burning features which prevent the establishment of a true steady solution.

Here, we explore the structure of three premixed hydrogen-air flames: stoichiometric and lean flat steady flames (one-dimensional), and a time-dependent lean freely-propagating (two-dimensional) case.

More information can be found here......


Freely Propagating Hydrogen-Methane Flames

Recent interest in alternative fuels such as hydrogen or syngas, obtained from coal gasification, has sparked the development of burners that can operate over a broad range of fuels.

We have run simulations of a range of mixed (hydrogen and methane) flames, focusing primarily on the structure of the heat release and reaction paths of carbon chemistry for the mixed fuels, which provides insight on understanding flame dynamics.

More information can be found here......


Turbulence-Flame Interactions in Lean Premixed Hydrogen Flames

Turbulent flames have been reported to be quenched when turbulence levels become sufficiently high.

However, in a recent study by Aspden et al. (2008) in supernova flames, global extinction was not observed, even at a Karlovitz number of 230.

In this study, we consider lean premixed hydrogen flames at a range of Karlovitz numbers from 10 to 1560.

The figure on the left shows density, burning rate and temperature for the four Karlovitz numbers at an equivalence ratio of 0.40.

More information can be found here......