Journal article
Vorticity transport in the leading-edge vortex on a rotating blade
Journal of fluid mechanics, Vol.743, pp.249-261
03/25/2014
DOI: 10.1017/jfm.2014.18
Abstract
Vorticity transport is analysed within the leading-edge vortex generated on a rectangular flat plate of aspect ratio 4 undergoing a starting rotation motion in a quiescent fluid. Two analyses are conducted on the inboard half of the blade to better understand the vorticity transport mechanisms responsible for maintaining the quasi-equilibrium state of the leading-edge vortex. An initial global analysis between the
$25$
and
$50\, \%$
spanwise positions suggests that, although spanwise velocity is significant, spanwise convection of vorticity is insufficient to balance the flux of vorticity from the leading-edge shear layer. Subsequent detailed analyses of vorticity transport in planar control volumes at the
$25$
and
$50\, \%$
spanwise positions verify this conclusion and demonstrate that vorticity annihilation due to interaction between the leading-edge vortex and the opposite-sign layer on the plate surface is an important, often dominant, mechanism for regulation of leading-edge-vortex circulation. Thus, it provides an important condition for maintenance of an attached leading-edge vortex on the inboard portion of the blade.
Details
- Title: Subtitle
- Vorticity transport in the leading-edge vortex on a rotating blade
- Creators
- Craig J Wojcik - University of IowaJames H. J Buchholz - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Journal of fluid mechanics, Vol.743, pp.249-261
- Publisher
- Cambridge University Press
- DOI
- 10.1017/jfm.2014.18
- ISSN
- 0022-1120
- eISSN
- 1469-7645
- Number of pages
- 13
- Language
- English
- Date published
- 03/25/2014
- Academic Unit
- Mechanical Engineering
- Record Identifier
- 9984196523902771
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