Journal article
Transient leading-edge vortex development on a wing rolling in uniform flow
Journal of fluid mechanics, Vol.957, A23
02/25/2023
DOI: 10.1017/jfm.2023.34
Abstract
Plenoptic particle image velocimetry and surface pressure measurements were used to analyse the early development of leading-edge vortices (LEVs) created by a flat-plate wing of aspect ratio 2 rolling in a uniform flow parallel to the roll axis. Four cases were constructed by considering two advance coefficients, $J=0.54$ and 1.36, and two wing radii of gyration, $R_g/c=2.5$ and 3.25. In each case, the wing pitch angle was articulated such as to achieve an angle of attack of $33^{\circ }$ at the radius of gyration of the wing. The sources and sinks of vorticity were quantified for a chordwise rectangular control region, using a vorticity transport framework in a non-inertial coordinate system attached to the wing. Within this framework, terms associated with Coriolis acceleration provide a correction to tilting and spanwise convective fluxes measured in the rotating frame and, for the present case, have insignificant values. For the baseline case ($J=0.54, R_g/c=3.25$), three distinct spanwise regions were observed within the LEV, with distinct patterns of vortex evolution and vorticity transport mechanisms in each region. Reducing the radius of gyration to $R_g/c=2.5$ resulted in a more stable vortex with the inboard region extending over a broader spanwise range. Increasing advance ratio eliminated the conical vortex, resulting in transport processes resembling the mid-span region of the baseline case. Although the circulation of the LEV system was generally stronger at the larger advance coefficient, the shear-layer contribution was diminished.
Details
- Title: Subtitle
- Transient leading-edge vortex development on a wing rolling in uniform flow
- Creators
- Kevin J. Wabick - University of IowaKyle C. Johnson - Auburn UniversityRandall L. Berdon - University of IowaBrian S. Thurow - Auburn UniversityJames H.J. Buchholz - 1Department of Mechanical Engineering/IIHR – Hydroscience & Engineering, University of Iowa, Iowa City, IA 52242, USA
- Resource Type
- Journal article
- Publication Details
- Journal of fluid mechanics, Vol.957, A23
- Publisher
- Cambridge University Press
- DOI
- 10.1017/jfm.2023.34
- ISSN
- 0022-1120
- eISSN
- 1469-7645
- Number of pages
- 28
- Grant note
- DOI: 10.13039/100000181, name: Air Force Office of Scientific Research, award: FA9550-16-1-0107
- Language
- English
- Date published
- 02/25/2023
- Academic Unit
- IIHR--Hydroscience and Engineering; Mechanical Engineering
- Record Identifier
- 9984368302702771
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