Photogrammetry Measurements of Blunt Body Dynamics in a Supersonic Wind Tunnel

Photogrammetry Measurements of Blunt Body Dynamics in a Supersonic Wind Tunnel | 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 Photogrammetry Measurements of Blunt Body Dynamics in a Supersonic Wind Tunnel Pietro Innocenzi, Paul J. K. Bruce, Salvador Navarro-Martinez This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-7601411/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 28 Jan, 2026 Read the published version in Experiments in Fluids → Version 1 posted 9 You are reading this latest preprint version Abstract This paper presents a novel and robust photogrammetry method to measure rigid-body dynamics in a high-speed wind tunnel. A faceted blunt model is free to rotate in roll, pitch and yaw in response to the freestream flow (M = 2) by means of a spherical air bearing. Four synchronised high-speed cameras capture the model from different angles, and the unique coded targets printed on the model’s surface are reconstructed as points in 3D space, achieving accuracy within 1 ◦ for both static and dynamic measurements. The Kabsch algorithm is used to find the optimal rotation between two point clouds, hence allowing reconstruction of the angular motion over the entire run. The experiments reveal a precessional instability previously reported only for slender bodies at hypersonic Mach numbers. The method shows promise for free-oscillation tests in high-speed ground facilities, with advantages over conventional IMU-based approaches such as non-invasivity, direct measurement of the model’s orientation, and higher sampling rates. Photogrammetry Supersonic wind tunnel Dynamic stability Re-entry Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Published Journal Publication published 28 Jan, 2026 Read the published version in Experiments in Fluids → Version 1 posted Editorial decision: Revision requested 19 Oct, 2025 Reviews received at journal 19 Oct, 2025 Reviews received at journal 08 Oct, 2025 Reviewers agreed at journal 21 Sep, 2025 Reviewers agreed at journal 19 Sep, 2025 Reviewers invited by journal 16 Sep, 2025 Editor assigned by journal 14 Sep, 2025 Submission checks completed at journal 12 Sep, 2025 First submitted to journal 12 Sep, 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. 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. 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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-7601411","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":518375142,"identity":"08785291-432c-4521-9796-14a31effb3f2","order_by":0,"name":"Pietro Innocenzi","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAsklEQVRIiWNgGAWjYDACZsbGBwkVElDeAaK0MDcbfDhDkhYG9jbJmW0wDjFazNkZG6R551nIM7AffsDMc4YILZbNjA3GvNskDBt40gyYeW4QocXgMGNDMlBLAgNDDgMzzwcitRzmnQPUwv+GeC2NjTMbgFokQLYQ4zCgX5oZPhyTMGyTeGZwcA4x3jfnP/78R0JNnTw/f/LDB2+OEeMwGIONgdiINCCsZBSMglEwCkY8AABcpDEqTxeLsgAAAABJRU5ErkJggg==","orcid":"","institution":"Imperial College London","correspondingAuthor":true,"prefix":"","firstName":"Pietro","middleName":"","lastName":"Innocenzi","suffix":""},{"id":518375143,"identity":"d0c00ce7-a806-4453-9a2b-cab3faa0abc4","order_by":1,"name":"Paul J. 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