Journal article
Parameter dependence of vortex interactions on a two-dimensional plunging plate
Experiments in fluids, Vol.55(3), pp.1-19
03/2014
DOI: 10.1007/s00348-014-1687-7
Abstract
The structure and dynamics of the flow field created by a plunging flat-plate airfoil are investigated at a chord Reynolds number of 10,000 while varying plunge amplitude and Strouhal number. Digital particle image velocimetry measurements are used to characterize the shedding patterns and the interactions between the leading- and trailing-edge vortex structures (LEV and TEV), resulting in the development of a wake classification system based on the nature and timing of interactions between the leading- and trailing-edge vortices. The streamwise advancement of the LEV during a plunge cycle and its resulting interaction with the TEV is primarily dependent on reduced frequency; however, for Strouhal numbers above approximately 0.4, significant changes are observed in the formation of vortices shed from the leading and trailing edges, as well as the circulation of the leading-edge vortex. The functional form of the relationship between leading-edge vortex circulation and Strouhal number suggests that the Strouhal number dependence is more specifically a manifestation of the effective angle of attack. Comparison with low-Reynolds-number studies of plunging airfoil aerodynamics reveals a high degree of consistency and suggests applicability of the classification system beyond the range examined in the present work.
Details
- Title: Subtitle
- Parameter dependence of vortex interactions on a two-dimensional plunging plate
- Creators
- Azar Eslam Panah - University of IowaJames Buchholz - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Experiments in fluids, Vol.55(3), pp.1-19
- Publisher
- Springer Berlin Heidelberg
- DOI
- 10.1007/s00348-014-1687-7
- ISSN
- 0723-4864
- eISSN
- 1432-1114
- Language
- English
- Date published
- 03/2014
- Academic Unit
- Mechanical Engineering
- Record Identifier
- 9984196643202771
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