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An experimental study on coflow diffusion combustion in a pellet-packed bed with different bed lengths

In experimental investigations on axial symmetry, over-ventilated CH(4)/air diffusion combustion in a packed bed is executed to study the height, shape and stability of the flame. The combustor is a quartz tube packed with alumina pellets in which a cylindrical fuel stream is surrounded by a coflow...

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Autores principales: Shi, Junrui, Liu, Yang, Liu, Yongqi, Mao, Mingming, Xia, Yongfang, Ma, Rui, Xu, Youning
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6124037/
https://www.ncbi.nlm.nih.gov/pubmed/30224986
http://dx.doi.org/10.1098/rsos.172027
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author Shi, Junrui
Liu, Yang
Liu, Yongqi
Mao, Mingming
Xia, Yongfang
Ma, Rui
Xu, Youning
author_facet Shi, Junrui
Liu, Yang
Liu, Yongqi
Mao, Mingming
Xia, Yongfang
Ma, Rui
Xu, Youning
author_sort Shi, Junrui
collection PubMed
description In experimental investigations on axial symmetry, over-ventilated CH(4)/air diffusion combustion in a packed bed is executed to study the height, shape and stability of the flame. The combustor is a quartz tube packed with alumina pellets in which a cylindrical fuel stream is surrounded by a coflow air nozzle. The results show that the bed length and pellet diameter have a significant influence on the flame properties. In general, the flame above the pellet surface has axial symmetry, and its shape and colour are similar to those of a conventional diffusion flame when the bed length is smaller. The colour of the flame front varies with the bed length. The changed colour indicates an increased flame front temperature and that the combustion regime above the bed surface may change from non-premixed combustion to partially premixed combustion or even premixed combustion owing to the mix and dispersion effect in the packed bed. In addition, multiple flame behaviours, such as an inclined flame front, isolated reaction zone and oscillatory motion followed by a pulsating sound with a few hertz in a packed bed, are observed experimentally. The possible reasons for these phenomena are discussed.
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spelling pubmed-61240372018-09-17 An experimental study on coflow diffusion combustion in a pellet-packed bed with different bed lengths Shi, Junrui Liu, Yang Liu, Yongqi Mao, Mingming Xia, Yongfang Ma, Rui Xu, Youning R Soc Open Sci Engineering In experimental investigations on axial symmetry, over-ventilated CH(4)/air diffusion combustion in a packed bed is executed to study the height, shape and stability of the flame. The combustor is a quartz tube packed with alumina pellets in which a cylindrical fuel stream is surrounded by a coflow air nozzle. The results show that the bed length and pellet diameter have a significant influence on the flame properties. In general, the flame above the pellet surface has axial symmetry, and its shape and colour are similar to those of a conventional diffusion flame when the bed length is smaller. The colour of the flame front varies with the bed length. The changed colour indicates an increased flame front temperature and that the combustion regime above the bed surface may change from non-premixed combustion to partially premixed combustion or even premixed combustion owing to the mix and dispersion effect in the packed bed. In addition, multiple flame behaviours, such as an inclined flame front, isolated reaction zone and oscillatory motion followed by a pulsating sound with a few hertz in a packed bed, are observed experimentally. The possible reasons for these phenomena are discussed. The Royal Society 2018-08-22 /pmc/articles/PMC6124037/ /pubmed/30224986 http://dx.doi.org/10.1098/rsos.172027 Text en © 2018 The Authors. http://creativecommons.org/licenses/by/4.0/ Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.
spellingShingle Engineering
Shi, Junrui
Liu, Yang
Liu, Yongqi
Mao, Mingming
Xia, Yongfang
Ma, Rui
Xu, Youning
An experimental study on coflow diffusion combustion in a pellet-packed bed with different bed lengths
title An experimental study on coflow diffusion combustion in a pellet-packed bed with different bed lengths
title_full An experimental study on coflow diffusion combustion in a pellet-packed bed with different bed lengths
title_fullStr An experimental study on coflow diffusion combustion in a pellet-packed bed with different bed lengths
title_full_unstemmed An experimental study on coflow diffusion combustion in a pellet-packed bed with different bed lengths
title_short An experimental study on coflow diffusion combustion in a pellet-packed bed with different bed lengths
title_sort experimental study on coflow diffusion combustion in a pellet-packed bed with different bed lengths
topic Engineering
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6124037/
https://www.ncbi.nlm.nih.gov/pubmed/30224986
http://dx.doi.org/10.1098/rsos.172027
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