The diffusive-thermal instability of premixed flames with low unburned-gas temperature under the adiabatic and non-adiabatic conditions

We elucidated the diffusive-thermal instability of premixed flames with low unburned-gas temperature under the adiabatic and non-adiabatic conditions. Numerical calculations of two-dimensional unsteady reactive flows were performed, based on the diffusive-thermal model equation. Lewis numbers smalle...

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Autores principales:	Thwe Thwe AUNG, Satoshi KADOWAKI
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2015
Materias:	premixed flame diffusive-thermal instability low temperature heat loss zeldovich number cellular flame Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/25a6fc9787d249c0a54a86e45db32cbe
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spelling	oai:doaj.org-article:25a6fc9787d249c0a54a86e45db32cbe2021-11-26T06:30:10ZThe diffusive-thermal instability of premixed flames with low unburned-gas temperature under the adiabatic and non-adiabatic conditions2187-974510.1299/mej.14-00460https://doaj.org/article/25a6fc9787d249c0a54a86e45db32cbe2015-09-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/2/5/2_14-00460/_pdf/-char/enhttps://doaj.org/toc/2187-9745We elucidated the diffusive-thermal instability of premixed flames with low unburned-gas temperature under the adiabatic and non-adiabatic conditions. Numerical calculations of two-dimensional unsteady reactive flows were performed, based on the diffusive-thermal model equation. Lewis numbers smaller than unity were adopted, and radiative heat loss was treated. As the unburned-gas temperature became lower, the growth rate decreased and the unstable range narrowed, which was due to the decrease of the burning velocity of a planar flame. As for the growth rate and unstable range normalized by the burning velocity of a planar flame, the former increased and the latter widened. This was due to the enlargement of Zeldovich numbers. Taking account of radiative heat loss, the normalized growth rate was large and the normalized unstable range was wide. This indicated that the heat loss had a pronounced influence on the diffusive-thermal instability of premixed flames with low unburned-gas temperature. Moreover, the cellular-shape flame fronts formed owing to diffusive-thermal instability. The burning velocity of a cellular flame normalized by that of a planar flame increased as the unburned-gas temperature became lower and the heat loss became greater. This was because of the enlargement of Zeldovich numbers and the pronounced influence of heat loss.Thwe Thwe AUNGSatoshi KADOWAKIThe Japan Society of Mechanical Engineersarticlepremixed flamediffusive-thermal instabilitylow temperatureheat losszeldovich numbercellular flameMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 2, Iss 5, Pp 14-00460-14-00460 (2015)
institution	DOAJ
collection	DOAJ
language	EN
topic	premixed flame diffusive-thermal instability low temperature heat loss zeldovich number cellular flame Mechanical engineering and machinery TJ1-1570
spellingShingle	premixed flame diffusive-thermal instability low temperature heat loss zeldovich number cellular flame Mechanical engineering and machinery TJ1-1570 Thwe Thwe AUNG Satoshi KADOWAKI The diffusive-thermal instability of premixed flames with low unburned-gas temperature under the adiabatic and non-adiabatic conditions
description	We elucidated the diffusive-thermal instability of premixed flames with low unburned-gas temperature under the adiabatic and non-adiabatic conditions. Numerical calculations of two-dimensional unsteady reactive flows were performed, based on the diffusive-thermal model equation. Lewis numbers smaller than unity were adopted, and radiative heat loss was treated. As the unburned-gas temperature became lower, the growth rate decreased and the unstable range narrowed, which was due to the decrease of the burning velocity of a planar flame. As for the growth rate and unstable range normalized by the burning velocity of a planar flame, the former increased and the latter widened. This was due to the enlargement of Zeldovich numbers. Taking account of radiative heat loss, the normalized growth rate was large and the normalized unstable range was wide. This indicated that the heat loss had a pronounced influence on the diffusive-thermal instability of premixed flames with low unburned-gas temperature. Moreover, the cellular-shape flame fronts formed owing to diffusive-thermal instability. The burning velocity of a cellular flame normalized by that of a planar flame increased as the unburned-gas temperature became lower and the heat loss became greater. This was because of the enlargement of Zeldovich numbers and the pronounced influence of heat loss.
format	article
author	Thwe Thwe AUNG Satoshi KADOWAKI
author_facet	Thwe Thwe AUNG Satoshi KADOWAKI
author_sort	Thwe Thwe AUNG
title	The diffusive-thermal instability of premixed flames with low unburned-gas temperature under the adiabatic and non-adiabatic conditions
title_short	The diffusive-thermal instability of premixed flames with low unburned-gas temperature under the adiabatic and non-adiabatic conditions
title_full	The diffusive-thermal instability of premixed flames with low unburned-gas temperature under the adiabatic and non-adiabatic conditions
title_fullStr	The diffusive-thermal instability of premixed flames with low unburned-gas temperature under the adiabatic and non-adiabatic conditions
title_full_unstemmed	The diffusive-thermal instability of premixed flames with low unburned-gas temperature under the adiabatic and non-adiabatic conditions
title_sort	diffusive-thermal instability of premixed flames with low unburned-gas temperature under the adiabatic and non-adiabatic conditions
publisher	The Japan Society of Mechanical Engineers
publishDate	2015
url	https://doaj.org/article/25a6fc9787d249c0a54a86e45db32cbe
work_keys_str_mv	AT thwethweaung thediffusivethermalinstabilityofpremixedflameswithlowunburnedgastemperatureundertheadiabaticandnonadiabaticconditions AT satoshikadowaki thediffusivethermalinstabilityofpremixedflameswithlowunburnedgastemperatureundertheadiabaticandnonadiabaticconditions AT thwethweaung diffusivethermalinstabilityofpremixedflameswithlowunburnedgastemperatureundertheadiabaticandnonadiabaticconditions AT satoshikadowaki diffusivethermalinstabilityofpremixedflameswithlowunburnedgastemperatureundertheadiabaticandnonadiabaticconditions
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The diffusive-thermal instability of premixed flames with low unburned-gas temperature under the adiabatic and non-adiabatic conditions

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