Numerical investigation of geometrical modifications on premixed methane- air flame stability in a recirculation micro-combustor

Numerical investigation of geometrical modifications on premixed methane- air flame stability in a recirculation micro-combustor | 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 Numerical investigation of geometrical modifications on premixed methane- air flame stability in a recirculation micro-combustor Jalal Zarvandi, Mohammadreza Baigmohammadi, Saber rezaey This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-8991166/v1 This work is licensed under a CC BY 4.0 License Status: Under Revision Version 1 posted 15 You are reading this latest preprint version Abstract This research numerically examines the influence of flow recirculation within a micro-combustor facilitated by an auxiliary chamber. Computational results indicate that incorporating this auxiliary chamber promotes flow recirculation, thereby enhancing flame stability. Employing a recirculating micro-combustor allows for higher inlet flow velocities without causing flame extinction. The configuration under analysis includes a main chamber and an auxiliary chamber. The main chamber features a stepped tubular design, while the auxiliary chamber, responsible for inducing recirculation, consists of a plain tube with a central conductive wire. The inclusion of both the wire and the step in the tubes contributes to greater flame stability in micro-combustors. However, the numerical findings reveal that flow recirculation within the micro-combustor provides a substantially greater stabilizing effect compared to the other two approaches. Amirkabir Combustion Laboratory (ACL) Department of Aerospace Engineering Amirkabir University of Technology (Tehran polytechnic) Hafez Ave. Tehran 15875 − 4413 Iran [email protected] Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Under Revision Version 1 posted Editorial decision: Revision requested 05 May, 2026 Reviews received at journal 18 Apr, 2026 Reviews received at journal 16 Apr, 2026 Reviews received at journal 16 Apr, 2026 Reviews received at journal 10 Apr, 2026 Reviewers agreed at journal 10 Apr, 2026 Reviews received at journal 10 Apr, 2026 Reviewers agreed at journal 09 Apr, 2026 Reviewers agreed at journal 09 Apr, 2026 Reviewers agreed at journal 09 Apr, 2026 Reviewers agreed at journal 09 Apr, 2026 Reviewers invited by journal 09 Apr, 2026 Editor assigned by journal 02 Mar, 2026 Submission checks completed at journal 02 Mar, 2026 First submitted to journal 27 Feb, 2026 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. 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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-8991166","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":624603386,"identity":"eb6d5b38-4866-4c89-a82a-1d70b6b4f989","order_by":0,"name":"Jalal Zarvandi","email":"","orcid":"","institution":"Amirkabir University of Technology (Tehran polytechnic)","correspondingAuthor":false,"prefix":"","firstName":"Jalal","middleName":"","lastName":"Zarvandi","suffix":""},{"id":624603387,"identity":"83f99ff2-7181-4963-a86d-83ffaa9d86a9","order_by":1,"name":"Mohammadreza Baigmohammadi","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAA8ElEQVRIiWNgGAWjYFACHgaGBCBlAOawSchBRAtI0GLMA2YYENCCUMPGkNhDSItuA+/BDw9+bZMzZz+duuFHmUX6fonkA8wFeLSYHeBLlkjsu21s2ZO77WbPOYncHom0BOYZeLXwGEgk9txO3HAgd9sN3jaQlhwDZh78Wox/gLWcf7vt5t82iXQeifwPhLSYSST8AGq5kbvtNtCWBB6JHAb8Wg7zpVkkNtw2NrjxdtttmXMShj1nnhkcxqvleO/hmz/+3JYzOA/0/puyOnn29uSHj3kqcGthYAZixjY0wQN4NEDBH8JKRsEoGAWjYAQDAAv8VRe10O1vAAAAAElFTkSuQmCC","orcid":"","institution":"Eindhoven University of Technology","correspondingAuthor":true,"prefix":"","firstName":"Mohammadreza","middleName":"","lastName":"Baigmohammadi","suffix":""},{"id":624603388,"identity":"0f7824ea-7999-4ab7-9313-283f56b64919","order_by":2,"name":"Saber rezaey","email":"","orcid":"","institution":"K.N. 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