Research on Design Optimization and Aerodynamic Performance of Hub Cap in Axial Flow Fans

Research on Design Optimization and Aerodynamic Performance of Hub Cap in Axial Flow Fans | 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 Research on Design Optimization and Aerodynamic Performance of Hub Cap in Axial Flow Fans Shulian Liu, Dongliang Huang, Yunjian Zhu, Yu Chen, Peijun Gong, and 1 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-7454210/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 05 Dec, 2025 Read the published version in Iranian Journal of Science and Technology, Transactions of Mechanical Engineering → Version 1 posted 14 You are reading this latest preprint version Abstract This study employs Computational Fluid Dynamics (CFD) methods to analyze the impact of hub cap axial length and profile on the performance of an axial flow fan. It investigates how the hub cap influences airflow paths, flow separation, and vortex distribution. The results show that increasing the axial length of the hub cap can reduce vortex regions within the impeller, lower the pressure difference between the suction and pressure surfaces, and mitigate flow separation at the junction between the hub cap and hub contour. These findings indicate that more uniform blade loading decreases the likelihood of vortex formation and reduces energy dissipation, thereby improving fan pressure and efficiency. There exists an optimal axial length, beyond which further increases in axial length have little impact on the fan's performance. Moreover, when the axial length is fixed, a well-designed curved hub cap surface can further optimize airflow and enhance fan performance. Experimental validation was conducted to evaluate the impact of the presence or absence of a hub cap on fan efficiency. These studies provide valuable guidance for the design of high-efficiency, high-pressure axial flow fans. axial flow fan hub cap internal flow characteristics aerodynamic performance omega criterion Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Published Journal Publication published 05 Dec, 2025 Read the published version in Iranian Journal of Science and Technology, Transactions of Mechanical Engineering → Version 1 posted Editorial decision: Revision requested 12 Sep, 2025 Reviews received at journal 08 Sep, 2025 Reviews received at journal 03 Sep, 2025 Reviewers agreed at journal 01 Sep, 2025 Reviews received at journal 01 Sep, 2025 Reviewers agreed at journal 29 Aug, 2025 Reviewers agreed at journal 28 Aug, 2025 Reviewers agreed at journal 27 Aug, 2025 Reviews received at journal 27 Aug, 2025 Reviewers agreed at journal 27 Aug, 2025 Reviewers invited by journal 26 Aug, 2025 Editor assigned by journal 25 Aug, 2025 Submission checks completed at journal 25 Aug, 2025 First submitted to journal 25 Aug, 2025 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-7454210","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":508481447,"identity":"f433ad82-277b-4aaa-9343-05a152cf0c7d","order_by":0,"name":"Shulian 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