The Aerodynamics of Sharp- and Filet-Edged Cylinders in High Supersonic Flow

The Aerodynamics of Sharp- and Filet-Edged Cylinders in High Supersonic Flow | 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 The Aerodynamics of Sharp- and Filet-Edged Cylinders in High Supersonic Flow Travis Duchene, Stuart Laurence This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-5397324/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 25 Jan, 2025 Read the published version in Experiments in Fluids → Version 1 posted 4 You are reading this latest preprint version Abstract To develop a physical understanding and accurate trajectory models for atmospheric re-entry objects like space debris, the influence of the flight attitude on the aerodynamic coefficients of cylindrical bodies in high-speed flow is of interest. Experiments were conducted in a Mach-4 Ludweig tube at The University of Maryland to study the aerodynamics of cylinders with varying aspect ratios and edge sharpness. A free-flight technique with a high-speed object tracking apparatus was used that allows unconstrained model motion, free of any sting interference, over a full range of angle of attack. A piece-wise analytic function for the model outline combined with a subpixel edge-detection routine allowed measurements of the aerodynamic coefficients based on the 4-degrees-of-freedom model motion. Experimental results were compared to modified Newtonian flow solutions, with generally good agreement. The influence of the angle of attack on the aerodynamic loading was determined to vary strongly according to the aspect ratio and edge radius. In the case of sharp-edged cylinders, increasing the aspect ratio led to an increase in both the flight region for positive lift and larger regions of dynamic stability. By adding curvature to the cylinder base edges, the location of the statically stable trim points occur at the fully-base-exposed and fully-body-exposed orientations. It was also found that the flight attitude region for which the cylinder was dynamically stable was expanded due to the addition of edge curvature. Further, as the aspect ratio was increased for these curved edged cylinders, the magnitude of the moment coefficient increased noticeably. Full Text Additional Declarations No competing interests reported. Supplementary Files AbstractGraphic.eps Cite Share Download PDF Status: Published Journal Publication published 25 Jan, 2025 Read the published version in Experiments in Fluids → Version 1 posted Editorial decision: Revision requested 11 Nov, 2024 Editor assigned by journal 06 Nov, 2024 Submission checks completed at journal 05 Nov, 2024 First submitted to journal 05 Nov, 2024 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. We do this by developing innovative software and high quality services for the global research community. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. 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By adding curvature to the cylinder base edges, the location of the statically stable trim points occur at the fully-base-exposed and fully-body-exposed orientations. It was also found that the flight attitude region for which the cylinder was dynamically stable was expanded due to the addition of edge curvature. 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