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|Title: ||Large eddy simulation of hydrogen-air premixed flames in a small scale combustion chamber|
|Authors: ||Abdel-Raheem, Mohamed A.|
Ibrahim, Salah S.
Masri, Assaad R.
Dynamic flame surface density
Large Eddy simulation
Regimes of combustion
|Issue Date: ||2015|
|Publisher: ||© Hydrogen Energy Publications, LLC. Published by Elsevier Ltd.|
|Citation: ||ABDEL-RAHEEM, M.A. ... et al., 2015. Large eddy simulation of hydrogen-air premixed flames in a small scale combustion chamber. International Journal of Hydrogen Energy, 40 (7), pp. 3098 - 3109.|
|Abstract: ||While hydrogen is attractive as a clean fuel, it poses a significant risk due to its highreactivity.
This paper presents Large Eddy Simulations (LES) of turbulent premixed
flames of hydrogeneair mixtures propagating in a small scale combustion chamber. The
sub-grid-scale model for reaction rate uses a dynamic procedure for calculating the flame/
flow interactions. Sensitivity of the results to the ignition source and to different flow
configurations is examined. Using the relevant parameter from the calculations, the flames
are located on the regimes of combustion and are found to span the thin and corrugated
flamelet regimes, hence confirming the validity of flamelet modelling. The calculations are
compared to published experimental data for a similar configuration. It is found that both
the peak overpressure and flame position are affected by the number of baffles positioned
in the path of the flame and this is consistent with earlier findings for hydrocarbon fuels.
Also, the LES technique is able to reproduce the same flame shape as the experimental
images. A coarse study of sensitivity to the ignition source shows that the size of the
ignition kernel does not affect the flame structure but influences only the time where the
peak overpressure appears while moving the ignition source away from the base plate
leads to a decrease in the peak overpressure.|
|Description: ||Closed access|
|Publisher Link: ||http://dx.doi.org/10.1016/j.ijhydene.2014.12.042|
|Appears in Collections:||Closed Access (Mechanical, Electrical and Manufacturing Engineering)|
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