Large Eddy Simulation of Air-Propane Premixed Combustion in a Curved Duct

Large Eddy Simulation of Air-Propane Premixed Combustion in a Curved Duct | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article Large Eddy Simulation of Air-Propane Premixed Combustion in a Curved Duct Ghasem moshir, Alireza Mostofizadeh, Mehrdad Bazazzadeh, Arash Shams Taleghani This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-5333602/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract Centrifugal force induction in the flow field during premixed combustion significantly influences flame propagation speed and temperature distribution. This study employs large-eddy simulation to analyze air-propane premixed combustion within a curved duct featuring a square cross-section and a step in the outer wall. The numerical analysis was conducted using OpenFOAM software. The original case was examined at two distinct inlet velocities (4 m/s and 40 m/s). Computational chemiluminescence and shadowgraph images were compared with experimental data, demonstrating satisfactory accuracy. The curvature of the duct geometry induces centrifugal forces within the flow field. Additionally, the density difference between combustion products and reactants generates Rayleigh-Taylor instability, which causes wrinkling and corrugation of the flame surface. At higher inlet velocities, both the induced centrifugal force and the degree of wrinkling increased, leading to an enhanced flame surface area and improved temperature distribution at the duct outlet. Two additional duct designs were developed to investigate the effects of flow rotation and curvature radius. The temperature distribution at the outlet for the two newly designed ducts and the primary duct was found to be nearly identical; however, the flame surface area exhibited significant improvement. Notably, the maximum flame propagation speed was observed in the configuration with a higher curvature radius. Large Eddy Simulation Centrifugal Force Rayleigh-Taylor Instability Wrinkling Premixed Combustion Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Posted Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-5333602","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":370683325,"identity":"b975504a-f21d-40f2-8525-75e5e4b3bd1c","order_by":0,"name":"Ghasem moshir","email":"","orcid":"","institution":"Malek Ashtar University of Technology","correspondingAuthor":false,"prefix":"","firstName":"Ghasem","middleName":"","lastName":"moshir","suffix":""},{"id":370683326,"identity":"e7c88516-288c-4848-9bac-4d88a69bbd15","order_by":1,"name":"Alireza Mostofizadeh","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAA2klEQVRIiWNgGAWjYDAD9mbmA0BKQoZYDQYMPIfZEkBaeEjQcoDHAMQirIV/9gHWDR/+/JHjYef5/OpGjQUPA/vhoxvwaZE4l8B2c2abgTEPM+8265xjQIfxpKXdwGvNGQa227wNBon7gVqMc9iAWiR4zPBqkQdp4fljkNjDzPPMOOcfEVoMwFrYwFqYH+e2EaHF8AxjG9AvxkC/sJkx5/ZJ8LAR8ovcGeZjNz78kZPj4T/8+HPOtzo5fvbDx/B7n4GxAcZikwCT+JWjAuYPpKgeBaNgFIyCkQMAPH8/6Duss5oAAAAASUVORK5CYII=","orcid":"","institution":"Malek Ashtar University of Technology","correspondingAuthor":true,"prefix":"","firstName":"Alireza","middleName":"","lastName":"Mostofizadeh","suffix":""},{"id":370683327,"identity":"2d410a1b-57e5-4cef-84a2-7124c34614c1","order_by":2,"name":"Mehrdad Bazazzadeh","email":"","orcid":"","institution":"Malek Ashtar University of Technology","correspondingAuthor":false,"prefix":"","firstName":"Mehrdad","middleName":"","lastName":"Bazazzadeh","suffix":""},{"id":370683328,"identity":"3237a59f-2360-481c-a9d5-b46dc147ad64","order_by":3,"name":"Arash Shams Taleghani","email":"","orcid":"","institution":"Aerospace Research Institute","correspondingAuthor":false,"prefix":"","firstName":"Arash","middleName":"Shams","lastName":"Taleghani","suffix":""}],"badges":[],"createdAt":"2024-10-25 16:08:01","currentVersionCode":1,"declarations":"","doi":"10.21203/rs.3.rs-5333602/v1","doiUrl":"https://doi.org/10.21203/rs.3.rs-5333602/v1","draftVersion":[],"editorialEvents":[],"editorialNote":"","failedWorkflow":false,"files":[{"id":75531002,"identity":"6eae0d01-7b85-45e8-b6a9-8d6208210d79","added_by":"auto","created_at":"2025-02-05 14:02:15","extension":"pdf","order_by":1,"title":"","display":"","copyAsset":false,"role":"manuscript-pdf","size":1212316,"visible":true,"origin":"","legend":"","description":"","filename":"Moshircorrection8.3new.pdf","url":"https://assets-eu.researchsquare.com/files/rs-5333602/v1_covered_aee50136-1e9d-40de-b25b-88108af722bf.pdf"}],"financialInterests":"No competing interests reported.","formattedTitle":"Large Eddy Simulation of Air-Propane Premixed Combustion in a Curved Duct","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":false,"hideJournal":true,"highlight":"","institution":"","isAcceptedByJournal":false,"isAuthorSuppliedPdf":true,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":true,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"researchsquare","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":true,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"/submission","title":"Research Square","twitterHandle":"researchsquare","acdcEnabled":true,"dfaEnabled":false,"editorialSystem":"","reportingPortfolio":"","inReviewEnabled":false,"inReviewRevisionsEnabled":true},"keywords":"Large Eddy Simulation, Centrifugal Force, Rayleigh-Taylor Instability, Wrinkling, Premixed Combustion","lastPublishedDoi":"10.21203/rs.3.rs-5333602/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-5333602/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003eCentrifugal force induction in the flow field during premixed combustion significantly influences flame propagation speed and temperature distribution. This study employs large-eddy simulation to analyze air-propane premixed combustion within a curved duct featuring a square cross-section and a step in the outer wall. The numerical analysis was conducted using OpenFOAM software. The original case was examined at two distinct inlet velocities (4 m/s and 40 m/s). Computational chemiluminescence and shadowgraph images were compared with experimental data, demonstrating satisfactory accuracy. The curvature of the duct geometry induces centrifugal forces within the flow field. Additionally, the density difference between combustion products and reactants generates Rayleigh-Taylor instability, which causes wrinkling and corrugation of the flame surface. At higher inlet velocities, both the induced centrifugal force and the degree of wrinkling increased, leading to an enhanced flame surface area and improved temperature distribution at the duct outlet. Two additional duct designs were developed to investigate the effects of flow rotation and curvature radius. The temperature distribution at the outlet for the two newly designed ducts and the primary duct was found to be nearly identical; however, the flame surface area exhibited significant improvement. 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