Large eddy simulation of hydrogen-air premixed flames in a small scale combustion chamber

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...

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Main Authors: Mohamed Abdel-Raheem, Salah Ibrahim, Weeratunge Malalasekera, Assaad R. Masri
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Published: 2015
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Online Access:https://hdl.handle.net/2134/20017
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spelling rr-article-95460232015-01-01T00:00:00Z Large eddy simulation of hydrogen-air premixed flames in a small scale combustion chamber Mohamed Abdel-Raheem (1255950) Salah Ibrahim (1250199) Weeratunge Malalasekera (1258755) Assaad R. Masri (7205414) Mechanical engineering not elsewhere classified Hydrogen Reaction rate Dynamic flame surface density Large Eddy simulation Regimes of combustion Mechanical Engineering not elsewhere classified 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. 2015-01-01T00:00:00Z Text Journal contribution 2134/20017 https://figshare.com/articles/journal_contribution/Large_eddy_simulation_of_hydrogen-air_premixed_flames_in_a_small_scale_combustion_chamber/9546023 CC BY-NC-ND 4.0
institution Loughborough University
collection Figshare
topic Mechanical engineering not elsewhere classified
Hydrogen
Reaction rate
Dynamic flame surface density
Large Eddy simulation
Regimes of combustion
Mechanical Engineering not elsewhere classified
spellingShingle Mechanical engineering not elsewhere classified
Hydrogen
Reaction rate
Dynamic flame surface density
Large Eddy simulation
Regimes of combustion
Mechanical Engineering not elsewhere classified
Mohamed Abdel-Raheem
Salah Ibrahim
Weeratunge Malalasekera
Assaad R. Masri
Large eddy simulation of hydrogen-air premixed flames in a small scale combustion chamber
description 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.
format Default
Article
author Mohamed Abdel-Raheem
Salah Ibrahim
Weeratunge Malalasekera
Assaad R. Masri
author_facet Mohamed Abdel-Raheem
Salah Ibrahim
Weeratunge Malalasekera
Assaad R. Masri
author_sort Mohamed Abdel-Raheem (1255950)
title Large eddy simulation of hydrogen-air premixed flames in a small scale combustion chamber
title_short Large eddy simulation of hydrogen-air premixed flames in a small scale combustion chamber
title_full Large eddy simulation of hydrogen-air premixed flames in a small scale combustion chamber
title_fullStr Large eddy simulation of hydrogen-air premixed flames in a small scale combustion chamber
title_full_unstemmed Large eddy simulation of hydrogen-air premixed flames in a small scale combustion chamber
title_sort large eddy simulation of hydrogen-air premixed flames in a small scale combustion chamber
publishDate 2015
url https://hdl.handle.net/2134/20017
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