FLUID-STRUCTURE-INTERACTION OF A FLEXIBLE COMPOSITE HYDROFOIL IN FORCED ROTATIONAL OSCILLATION MOTION

9th Symposium on Fluid-Structure Interactions, Flow-Sound Interactions, Flow-Induced Vibration & Noise

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Field Value
 
Title FLUID-STRUCTURE-INTERACTION OF A FLEXIBLE COMPOSITE HYDROFOIL IN FORCED ROTATIONAL OSCILLATION MOTION
 
Creator Stefan Hoerner; LSS, University Magdeburg LEGI, University Grenoble
Cyrille Bonamy; LEGI, CNRS, France
Thierry Maître; LEGI, Grenoble INP, France
Dominique Thévenin; LSS, University Magdeburg
 
Subject Large deformations; Adaptive structures; Hydropower;
 
Description The presentation concerns experimental research of the behavior of a NACA0018 Hydrofoil. It consists of a composite structure from a rigid aluminum-milled leading edge and, beyond the first quarter of the cord, from a carbon-blade skeleton filled with silicone. The resulting structure is highly flexible, leading to large deformations when set into motion within the hydrodynamic tunnel at LEGI Grenoble.
Aim of the study is to investigate the impact of flexible structures as rotor blades of vertical-axis water turbines. It was observed that deformable blades can reduce peak loads and drag for working points with high angles of incidence, experiencing stall conditions. This is particularly important to improve efficiency at low tip-speed-ratio.
The foil deformation has been tracked using image analysis. A high-speed camera captures a grid projected onto the surface of the structure. The distance to the profile can then be recovered with high precision and a temporal resolution of about 4000 samples per second with the use of a spectral analysis of the grid deformation.
The presentation will show results from the surface tracking algorithm compared to force measurements.
See www.ovgu.de/hoerner/flexProfile.mp4 for a video of the hydrofoil.
 
Publisher Paper Management System for FIV2018
 
Contributor German Federal Ministry of Education and Research, Rosa-Luxemburg-Foundation, German-French-University
 
Date 2018-05-07 15:41:00
 
Type Peer-reviewed Paper
experimental
 
Format application/pdf
 
Identifier http://www.fiv2018.com/ocs/index.php/fiv2018/fivcan/paper/view/185
 
Source Paper Management System for FIV2018; FIV2018 Conference
 
Language en
 
Rights Authors who submit to this conference agree to the following terms:<br /> <strong>a)</strong> Authors retain copyright over their work, while allowing the conference to place this unpublished work under a <a href="http://creativecommons.org/licenses/by/3.0/">Creative Commons Attribution License</a>, which allows others to freely access, use, and share the work, with an acknowledgement of the work's authorship and its initial presentation at this conference.<br /> <strong>b)</strong> Authors are able to waive the terms of the CC license and enter into separate, additional contractual arrangements for the non-exclusive distribution and subsequent publication of this work (e.g., publish a revised version in a journal, post it to an institutional repository or publish it in a book), with an acknowledgement of its initial presentation at this conference.<br /> <strong>c)</strong> In addition, authors are encouraged to post and share their work online (e.g., in institutional repositories or on their website) at any point before and after the conference.
 

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