An analytic probability density function for partially premixed flames with detailed chemistry
Laminar premixed flame profiles of methane/air free flames and strained flames at different fuel/air ratios and strain rates are analyzed using detailed chemistry with Lewis numbers equal to one. It is shown that the detailed chemistry flame profiles of progress variables CO2 + CO and H2O + H2 in ca...
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Veröffentlicht in: | Physics of fluids (1994) 2021-03, Vol.33 (3) |
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description | Laminar premixed flame profiles of methane/air free flames and strained flames at different fuel/air ratios and strain rates are analyzed using detailed chemistry with Lewis numbers equal to one. It is shown that the detailed chemistry flame profiles of progress variables CO2 + CO and H2O + H2 in canonically stretched coordinates can be fitted accurately by a slight generalization of recently proposed analytical presumed flame profiles over a wide range of fuel/air ratios through adaptation of a single model parameter. Strained flame profiles can be reproduced using an additional linear coordinate transformation, emulating the compression of the preheat zone by strain as predicted by premixed flame theory. The model parameter can alternatively be determined using only the laminar flame speeds and the fully burnt temperatures from the laminar flame calculations. The stretch factor of the coordinate transformation is proportional to cp/lambda, which drops by a factor up to 4 across the laminar flame. It is shown how the non-constant cp/lambda modifies the laminar flame probability density function (pdf) and a polynomial fit to cp/lambda as a function of the progress variable allows analytical results for the laminar flame pdf and the mean value of the progress variable and of the reaction source term. An analytic pdf for partially premixed flames is proposed based on Bayes's theorem as a combination of a beta pdf for the mixture fraction and the laminar flame pdf's evaluated at the respective fuel/air ratio. |
doi_str_mv | 10.1063/5.0038888 |
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It is shown that the detailed chemistry flame profiles of progress variables CO2 + CO and H2O + H2 in canonically stretched coordinates can be fitted accurately by a slight generalization of recently proposed analytical presumed flame profiles over a wide range of fuel/air ratios through adaptation of a single model parameter. Strained flame profiles can be reproduced using an additional linear coordinate transformation, emulating the compression of the preheat zone by strain as predicted by premixed flame theory. The model parameter can alternatively be determined using only the laminar flame speeds and the fully burnt temperatures from the laminar flame calculations. The stretch factor of the coordinate transformation is proportional to cp/lambda, which drops by a factor up to 4 across the laminar flame. It is shown how the non-constant cp/lambda modifies the laminar flame probability density function (pdf) and a polynomial fit to cp/lambda as a function of the progress variable allows analytical results for the laminar flame pdf and the mean value of the progress variable and of the reaction source term. An analytic pdf for partially premixed flames is proposed based on Bayes's theorem as a combination of a beta pdf for the mixture fraction and the laminar flame pdf's evaluated at the respective fuel/air ratio.</description><identifier>ISSN: 1070-6631</identifier><identifier>EISSN: 1089-7666</identifier><identifier>DOI: 10.1063/5.0038888</identifier><identifier>CODEN: PHFLE6</identifier><language>eng</language><publisher>Melville: American Institute of Physics</publisher><subject>Compression zone ; Coordinate transformations ; Flames ; Fluid dynamics ; Fuels ; Lewis numbers ; Mathematical models ; Parameters ; Physics ; Polynomials ; Premixed flames ; Probability density functions ; Strain analysis</subject><ispartof>Physics of fluids (1994), 2021-03, Vol.33 (3)</ispartof><rights>Author(s)</rights><rights>2021 Author(s). 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It is shown that the detailed chemistry flame profiles of progress variables CO2 + CO and H2O + H2 in canonically stretched coordinates can be fitted accurately by a slight generalization of recently proposed analytical presumed flame profiles over a wide range of fuel/air ratios through adaptation of a single model parameter. Strained flame profiles can be reproduced using an additional linear coordinate transformation, emulating the compression of the preheat zone by strain as predicted by premixed flame theory. The model parameter can alternatively be determined using only the laminar flame speeds and the fully burnt temperatures from the laminar flame calculations. The stretch factor of the coordinate transformation is proportional to cp/lambda, which drops by a factor up to 4 across the laminar flame. It is shown how the non-constant cp/lambda modifies the laminar flame probability density function (pdf) and a polynomial fit to cp/lambda as a function of the progress variable allows analytical results for the laminar flame pdf and the mean value of the progress variable and of the reaction source term. An analytic pdf for partially premixed flames is proposed based on Bayes's theorem as a combination of a beta pdf for the mixture fraction and the laminar flame pdf's evaluated at the respective fuel/air ratio.</description><subject>Compression zone</subject><subject>Coordinate transformations</subject><subject>Flames</subject><subject>Fluid dynamics</subject><subject>Fuels</subject><subject>Lewis numbers</subject><subject>Mathematical models</subject><subject>Parameters</subject><subject>Physics</subject><subject>Polynomials</subject><subject>Premixed flames</subject><subject>Probability density functions</subject><subject>Strain analysis</subject><issn>1070-6631</issn><issn>1089-7666</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><recordid>eNp9kE1LAzEQhoMoWKsH_0HAk8LWfDTJ5liKX1DwolfDNE1oyna3Jim6_94s27NzmWHeZ4aZF6FbSmaUSP4oZoTwusQZmlBS60pJKc-HWpFKSk4v0VVKO1IozeQEfS1aDC00fQ4WH2K3hnVoQu7xxrVpyP7Y2hy6Fvsu4gPEHKBp-oK6ffh1G-wb2LuEf0LelpkMoSlNuy1qyrG_RhcemuRuTnmKPp-fPpav1er95W25WFWWaZYrX6taObIhc-DCinKcYpprq6QikgAUVXshmZ8L4EXlxFJaU3BiraitFZ-iu3FveeH76FI2u-4Yy1_JsLlWnFGheKHuR8rGLqXovDnEsIfYG0rMYJ8R5mRfYR9GNtmQYXDgH_gPpAhu8g</recordid><startdate>20210301</startdate><enddate>20210301</enddate><creator>Pfitzner, M.</creator><creator>Breda, P.</creator><general>American Institute of Physics</general><scope>AJDQP</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><orcidid>https://orcid.org/0000-0002-8279-622X</orcidid><orcidid>https://orcid.org/0000-0002-4362-6463</orcidid></search><sort><creationdate>20210301</creationdate><title>An analytic probability density function for partially premixed flames with detailed chemistry</title><author>Pfitzner, M. ; Breda, P.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c292t-f8787e0d04a35c500372939c767060aa7879f562f45a300330c1181ae5b71c873</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2021</creationdate><topic>Compression zone</topic><topic>Coordinate transformations</topic><topic>Flames</topic><topic>Fluid dynamics</topic><topic>Fuels</topic><topic>Lewis numbers</topic><topic>Mathematical models</topic><topic>Parameters</topic><topic>Physics</topic><topic>Polynomials</topic><topic>Premixed flames</topic><topic>Probability density functions</topic><topic>Strain analysis</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Pfitzner, M.</creatorcontrib><creatorcontrib>Breda, P.</creatorcontrib><collection>AIP Open Access Journals</collection><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Physics of fluids (1994)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Pfitzner, M.</au><au>Breda, P.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>An analytic probability density function for partially premixed flames with detailed chemistry</atitle><jtitle>Physics of fluids (1994)</jtitle><date>2021-03-01</date><risdate>2021</risdate><volume>33</volume><issue>3</issue><issn>1070-6631</issn><eissn>1089-7666</eissn><coden>PHFLE6</coden><abstract>Laminar premixed flame profiles of methane/air free flames and strained flames at different fuel/air ratios and strain rates are analyzed using detailed chemistry with Lewis numbers equal to one. It is shown that the detailed chemistry flame profiles of progress variables CO2 + CO and H2O + H2 in canonically stretched coordinates can be fitted accurately by a slight generalization of recently proposed analytical presumed flame profiles over a wide range of fuel/air ratios through adaptation of a single model parameter. Strained flame profiles can be reproduced using an additional linear coordinate transformation, emulating the compression of the preheat zone by strain as predicted by premixed flame theory. The model parameter can alternatively be determined using only the laminar flame speeds and the fully burnt temperatures from the laminar flame calculations. The stretch factor of the coordinate transformation is proportional to cp/lambda, which drops by a factor up to 4 across the laminar flame. It is shown how the non-constant cp/lambda modifies the laminar flame probability density function (pdf) and a polynomial fit to cp/lambda as a function of the progress variable allows analytical results for the laminar flame pdf and the mean value of the progress variable and of the reaction source term. An analytic pdf for partially premixed flames is proposed based on Bayes's theorem as a combination of a beta pdf for the mixture fraction and the laminar flame pdf's evaluated at the respective fuel/air ratio.</abstract><cop>Melville</cop><pub>American Institute of Physics</pub><doi>10.1063/5.0038888</doi><tpages>16</tpages><orcidid>https://orcid.org/0000-0002-8279-622X</orcidid><orcidid>https://orcid.org/0000-0002-4362-6463</orcidid><oa>free_for_read</oa></addata></record> |
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source | AIP Journals Complete; Alma/SFX Local Collection |
subjects | Compression zone Coordinate transformations Flames Fluid dynamics Fuels Lewis numbers Mathematical models Parameters Physics Polynomials Premixed flames Probability density functions Strain analysis |
title | An analytic probability density function for partially premixed flames with detailed chemistry |
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