Numerical investigation of the stagnating laminar premixed methane/air flame with fuel concentration oscillation using a four-step reaction mechanism

Responses of stagnating laminar methane/air premixed flames under fuel concentration oscillation, i.c., equivalence ratio oscillation, were numerically investigated using a one-step overall reaction mechanism and a four-step reaction mechanism that included CO and H2 formation. The flame motion was...

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Autores principales:	Sotaro MIYAMAE, Abdul Rahman Mohd ROSDZIMIN, Hisashi TOMITA, Takeshi YOKOMORI, Toshihisa UEDA
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2014
Materias:	numerical analysis flame response fuel concentration oscillation stagnating laminar flame methane/air premixed flame Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/f7498cbbde994a20a8fcdb89df214cfd
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spelling	oai:doaj.org-article:f7498cbbde994a20a8fcdb89df214cfd2021-11-26T06:14:30ZNumerical investigation of the stagnating laminar premixed methane/air flame with fuel concentration oscillation using a four-step reaction mechanism2187-974510.1299/mej.2014tep0060https://doaj.org/article/f7498cbbde994a20a8fcdb89df214cfd2014-12-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/1/6/1_2014tep0060/_pdf/-char/enhttps://doaj.org/toc/2187-9745Responses of stagnating laminar methane/air premixed flames under fuel concentration oscillation, i.c., equivalence ratio oscillation, were numerically investigated using a one-step overall reaction mechanism and a four-step reaction mechanism that included CO and H2 formation. The flame motion was numerically investigated for three different oscillation cases namely: lean, rich and lean-rich crossover case. Methane/air mixtures with sinusoidal equivalence ratio oscillations were issued from the burner exit with uniform 1.0 m/s velocity profiles. In the steady state condition, the one-step overall reaction mechanism and the four-step reaction mechanism had nearly the same characteristics in the lean region, while in the rich region variations in characteristics such as flame location and flame displacement speed for the four-step model were much more significant than those for one-step model. When the equivalence ratio was oscillated, the flame location oscillated. The amplitude of the flame location oscillation did not change with the equivalence ratio oscillation when the frequency of equivalence ratio oscillation was less than 8Hz, while it decreased monotonically when it exceeded 8 Hz. Here 8 Hz corresponds to a Strouhal number (St) of unity. Thus, this result indicates that the flame was in a quasi-steady state when St<1.0 while it became unstable when St>1.0. The variation in flame location and the flame displacement speed did not follow those for the steady state condition and made a limit cycles. This was due to the back support effect. The cycles were significantly inclined at higher frequencies. In the lean condition, the limit cycle was inclined similarly for both the one-step and four-step reaction mechanisms. In the rich condition, however, the limit cycle for the four-step reaction was more inclined than that for the one-step reaction. These results show that the formation of CO and H2 played an important role in the rich condition.Sotaro MIYAMAEAbdul Rahman Mohd ROSDZIMINHisashi TOMITATakeshi YOKOMORIToshihisa UEDAThe Japan Society of Mechanical Engineersarticlenumerical analysisflame responsefuel concentration oscillationstagnating laminar flamemethane/air premixed flameMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 1, Iss 6, Pp TEP0060-TEP0060 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	numerical analysis flame response fuel concentration oscillation stagnating laminar flame methane/air premixed flame Mechanical engineering and machinery TJ1-1570
spellingShingle	numerical analysis flame response fuel concentration oscillation stagnating laminar flame methane/air premixed flame Mechanical engineering and machinery TJ1-1570 Sotaro MIYAMAE Abdul Rahman Mohd ROSDZIMIN Hisashi TOMITA Takeshi YOKOMORI Toshihisa UEDA Numerical investigation of the stagnating laminar premixed methane/air flame with fuel concentration oscillation using a four-step reaction mechanism
description	Responses of stagnating laminar methane/air premixed flames under fuel concentration oscillation, i.c., equivalence ratio oscillation, were numerically investigated using a one-step overall reaction mechanism and a four-step reaction mechanism that included CO and H2 formation. The flame motion was numerically investigated for three different oscillation cases namely: lean, rich and lean-rich crossover case. Methane/air mixtures with sinusoidal equivalence ratio oscillations were issued from the burner exit with uniform 1.0 m/s velocity profiles. In the steady state condition, the one-step overall reaction mechanism and the four-step reaction mechanism had nearly the same characteristics in the lean region, while in the rich region variations in characteristics such as flame location and flame displacement speed for the four-step model were much more significant than those for one-step model. When the equivalence ratio was oscillated, the flame location oscillated. The amplitude of the flame location oscillation did not change with the equivalence ratio oscillation when the frequency of equivalence ratio oscillation was less than 8Hz, while it decreased monotonically when it exceeded 8 Hz. Here 8 Hz corresponds to a Strouhal number (St) of unity. Thus, this result indicates that the flame was in a quasi-steady state when St<1.0 while it became unstable when St>1.0. The variation in flame location and the flame displacement speed did not follow those for the steady state condition and made a limit cycles. This was due to the back support effect. The cycles were significantly inclined at higher frequencies. In the lean condition, the limit cycle was inclined similarly for both the one-step and four-step reaction mechanisms. In the rich condition, however, the limit cycle for the four-step reaction was more inclined than that for the one-step reaction. These results show that the formation of CO and H2 played an important role in the rich condition.
format	article
author	Sotaro MIYAMAE Abdul Rahman Mohd ROSDZIMIN Hisashi TOMITA Takeshi YOKOMORI Toshihisa UEDA
author_facet	Sotaro MIYAMAE Abdul Rahman Mohd ROSDZIMIN Hisashi TOMITA Takeshi YOKOMORI Toshihisa UEDA
author_sort	Sotaro MIYAMAE
title	Numerical investigation of the stagnating laminar premixed methane/air flame with fuel concentration oscillation using a four-step reaction mechanism
title_short	Numerical investigation of the stagnating laminar premixed methane/air flame with fuel concentration oscillation using a four-step reaction mechanism
title_full	Numerical investigation of the stagnating laminar premixed methane/air flame with fuel concentration oscillation using a four-step reaction mechanism
title_fullStr	Numerical investigation of the stagnating laminar premixed methane/air flame with fuel concentration oscillation using a four-step reaction mechanism
title_full_unstemmed	Numerical investigation of the stagnating laminar premixed methane/air flame with fuel concentration oscillation using a four-step reaction mechanism
title_sort	numerical investigation of the stagnating laminar premixed methane/air flame with fuel concentration oscillation using a four-step reaction mechanism
publisher	The Japan Society of Mechanical Engineers
publishDate	2014
url	https://doaj.org/article/f7498cbbde994a20a8fcdb89df214cfd
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Numerical investigation of the stagnating laminar premixed methane/air flame with fuel concentration oscillation using a four-step reaction mechanism

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