Extinction and reignition in a diffusion flame: a direct numerical simulation study
The goal of this study is to provide a window into the physics of extinction and reignition via three-dimensional simulations of non-premixed combustion in isotropic decaying turbulence using one-step global reaction and neglecting density variations. Initially non-premixed fields of fuel and oxidan...
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| Veröffentlicht in: | Journal of fluid mechanics 2004-11, Vol.518, p.231-259 |
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| creator | SRIPAKAGORN, PAIBOON MITARAI, SATOSHI KOSÁLY, GEORGE PITSCH, HEINZ |
| description | The goal of this study is to provide a window into the physics of extinction and reignition via three-dimensional simulations of non-premixed combustion in isotropic decaying turbulence using one-step global reaction and neglecting density variations. Initially non-premixed fields of fuel and oxidant are developing in a turbulent field. Due to straining, the scalar dissipation rate is initially increasing and its fluctuations create extinguished regions on the stoichiometric surface. Later in the process, the stoichiometric surface again becomes uniformly hot. Besides using Eulerian data, this research applies flame element tracking and investigates the time history of individual points (‘flame elements’) along the stoichiometric surface. The main focus of the study is the discussion of the different scenarios of reignition. This paper identifies three major scenarios: independent flamelet scenario, reignition via edge (triple) flame propagation, and reignition through engulfment by a hot neighbourhood. The results give insight into the role different scenarios play in the reignition process, reveal the physical processes associated with each scenario, and provide the relative frequency of reignition for each scenario. |
| doi_str_mv | 10.1017/S0022112004001004 |
| format | Article |
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Initially non-premixed fields of fuel and oxidant are developing in a turbulent field. Due to straining, the scalar dissipation rate is initially increasing and its fluctuations create extinguished regions on the stoichiometric surface. Later in the process, the stoichiometric surface again becomes uniformly hot. Besides using Eulerian data, this research applies flame element tracking and investigates the time history of individual points (‘flame elements’) along the stoichiometric surface. The main focus of the study is the discussion of the different scenarios of reignition. This paper identifies three major scenarios: independent flamelet scenario, reignition via edge (triple) flame propagation, and reignition through engulfment by a hot neighbourhood. The results give insight into the role different scenarios play in the reignition process, reveal the physical processes associated with each scenario, and provide the relative frequency of reignition for each scenario.</description><identifier>ISSN: 0022-1120</identifier><identifier>EISSN: 1469-7645</identifier><identifier>DOI: 10.1017/S0022112004001004</identifier><identifier>CODEN: JFLSA7</identifier><language>eng</language><publisher>Cambridge, UK: Cambridge University Press</publisher><subject>Applied sciences ; Combustion. Flame ; Energy ; Energy. Thermal use of fuels ; Exact sciences and technology ; Miscellaneous ; Oxidizing agents ; Theoretical studies. Data and constants. Metering</subject><ispartof>Journal of fluid mechanics, 2004-11, Vol.518, p.231-259</ispartof><rights>2004 Cambridge University Press</rights><rights>2005 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c527t-ef7ff1a44a0fdcc7e9ec007dc85e5eeef90a5ea5be1b0aa2c0048ccc44e329493</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.cambridge.org/core/product/identifier/S0022112004001004/type/journal_article$$EHTML$$P50$$Gcambridge$$H</linktohtml><link.rule.ids>164,314,780,784,27924,27925,55628</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=16265030$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>SRIPAKAGORN, PAIBOON</creatorcontrib><creatorcontrib>MITARAI, SATOSHI</creatorcontrib><creatorcontrib>KOSÁLY, GEORGE</creatorcontrib><creatorcontrib>PITSCH, HEINZ</creatorcontrib><title>Extinction and reignition in a diffusion flame: a direct numerical simulation study</title><title>Journal of fluid mechanics</title><addtitle>J. Fluid Mech</addtitle><description>The goal of this study is to provide a window into the physics of extinction and reignition via three-dimensional simulations of non-premixed combustion in isotropic decaying turbulence using one-step global reaction and neglecting density variations. Initially non-premixed fields of fuel and oxidant are developing in a turbulent field. Due to straining, the scalar dissipation rate is initially increasing and its fluctuations create extinguished regions on the stoichiometric surface. Later in the process, the stoichiometric surface again becomes uniformly hot. Besides using Eulerian data, this research applies flame element tracking and investigates the time history of individual points (‘flame elements’) along the stoichiometric surface. The main focus of the study is the discussion of the different scenarios of reignition. This paper identifies three major scenarios: independent flamelet scenario, reignition via edge (triple) flame propagation, and reignition through engulfment by a hot neighbourhood. The results give insight into the role different scenarios play in the reignition process, reveal the physical processes associated with each scenario, and provide the relative frequency of reignition for each scenario.</description><subject>Applied sciences</subject><subject>Combustion. Flame</subject><subject>Energy</subject><subject>Energy. Thermal use of fuels</subject><subject>Exact sciences and technology</subject><subject>Miscellaneous</subject><subject>Oxidizing agents</subject><subject>Theoretical studies. Data and constants. 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| source | Cambridge University Press Journals Complete |
| subjects | Applied sciences Combustion. Flame Energy Energy. Thermal use of fuels Exact sciences and technology Miscellaneous Oxidizing agents Theoretical studies. Data and constants. Metering |
| title | Extinction and reignition in a diffusion flame: a direct numerical simulation study |
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