Numerical studies of turbulent premixed flame interaction with repeated solid obstacles

This paper presents numerical simulations of hydrogen and propane turbulent premixed flames interaction with repeated solid obstructions. The laboratory-scale combustion chamber used in this study is equipped with three solid baffles which promote the generation of turbulence and a square obstacle l...

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Main Authors:	Mohamed Elshimy, Salah Ibrahim, Weeratunge Malalasekera
Format:	Default Conference proceeding
Published:	2020
Subjects:	Combustion Hydrogen Dynamic flame surface density Large eddy simulation Area blockage ratio Overpressure Computational fluid dynamics
Online Access:	https://hdl.handle.net/2134/12746822.v1
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id	rr-article-12746822
record_format	Figshare
spelling	rr-article-127468222020-11-17T00:00:00Z Numerical studies of turbulent premixed flame interaction with repeated solid obstacles Mohamed Elshimy (5804771) Salah Ibrahim (1250199) Weeratunge Malalasekera (1258755) Combustion Hydrogen Dynamic flame surface density Large eddy simulation Area blockage ratio Overpressure Computational fluid dynamics This paper presents numerical simulations of hydrogen and propane turbulent premixed flames interaction with repeated solid obstructions. The laboratory-scale combustion chamber used in this study is equipped with three solid baffles which promote the generation of turbulence and a square obstacle located downstream from the ignition source. The test cases considered have two different area blockage ratios (ABR) of 24% and 50%, respectively. The large eddy simulation (LES) turbulence modelling technique is used. The numerical simulations are carried out using an in-house computational fluid dynamics (CFD) model. Two different flow configurations are examined, both using three consecutive baffles to identify the subsequent effects and the sensitivity of each fuel to increasing the ABR. These effects are studied using the nature of the flame-obstacles interaction, generated combustion overpressure and resultant flame speed. The modelling capability is confirmed by validating the numerical results against published experimental data. Conclusions are drawn that increasing the ABR increases the combustion overpressure, rate of pressure rise and flame speed. It is also concluded that the larger obstacle has a significant effect on the propagating flame structure and that hydrogen flames are more sensitive to an increased ABR and produce a significantly higher peak overpressure. 2020-11-17T00:00:00Z Text Conference contribution 2134/12746822.v1 https://figshare.com/articles/conference_contribution/Numerical_studies_of_turbulent_premixed_flame_interaction_with_repeated_solid_obstacles/12746822 CC BY 3.0
institution	Loughborough University
collection	Figshare
topic	Combustion Hydrogen Dynamic flame surface density Large eddy simulation Area blockage ratio Overpressure Computational fluid dynamics
spellingShingle	Combustion Hydrogen Dynamic flame surface density Large eddy simulation Area blockage ratio Overpressure Computational fluid dynamics Mohamed Elshimy Salah Ibrahim Weeratunge Malalasekera Numerical studies of turbulent premixed flame interaction with repeated solid obstacles
description	This paper presents numerical simulations of hydrogen and propane turbulent premixed flames interaction with repeated solid obstructions. The laboratory-scale combustion chamber used in this study is equipped with three solid baffles which promote the generation of turbulence and a square obstacle located downstream from the ignition source. The test cases considered have two different area blockage ratios (ABR) of 24% and 50%, respectively. The large eddy simulation (LES) turbulence modelling technique is used. The numerical simulations are carried out using an in-house computational fluid dynamics (CFD) model. Two different flow configurations are examined, both using three consecutive baffles to identify the subsequent effects and the sensitivity of each fuel to increasing the ABR. These effects are studied using the nature of the flame-obstacles interaction, generated combustion overpressure and resultant flame speed. The modelling capability is confirmed by validating the numerical results against published experimental data. Conclusions are drawn that increasing the ABR increases the combustion overpressure, rate of pressure rise and flame speed. It is also concluded that the larger obstacle has a significant effect on the propagating flame structure and that hydrogen flames are more sensitive to an increased ABR and produce a significantly higher peak overpressure.
format	Default Conference proceeding
author	Mohamed Elshimy Salah Ibrahim Weeratunge Malalasekera
author_facet	Mohamed Elshimy Salah Ibrahim Weeratunge Malalasekera
author_sort	Mohamed Elshimy (5804771)
title	Numerical studies of turbulent premixed flame interaction with repeated solid obstacles
title_short	Numerical studies of turbulent premixed flame interaction with repeated solid obstacles
title_full	Numerical studies of turbulent premixed flame interaction with repeated solid obstacles
title_fullStr	Numerical studies of turbulent premixed flame interaction with repeated solid obstacles
title_full_unstemmed	Numerical studies of turbulent premixed flame interaction with repeated solid obstacles
title_sort	numerical studies of turbulent premixed flame interaction with repeated solid obstacles
publishDate	2020
url	https://hdl.handle.net/2134/12746822.v1
_version_	1797277777960894464

Numerical studies of turbulent premixed flame interaction with repeated solid obstacles

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