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Analysis of intermittent trailing edge vortex shedding using recurrence plots

Mulleners, Karen and Rütten, Markus (2016) Analysis of intermittent trailing edge vortex shedding using recurrence plots. 18th International Symposium on the Applications of Laser and Imaging Techniques to Fluid Mechanics, 04.-07. Juli 2016, Lisbon, Portugal.

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Official URL: http://ltces.dem.ist.utl.pt/lxlaser/lxlaser2016/scope_technical_topics.asp

Abstract

Time resolved particle image velocimetry is conducted in the wake of a trailing edge separated flow past a NACA4415 airfoil at a fixed angle of attack beyond the static stall angle to analyse the formation and temporal evolution of the wake coherent structures. Under the presented experimental circumstances, intermittent trailing edge vortex shedding occurs. A flow diagnostic analysis combining the proper orthogonal decomposition method with a recurrence plot and quantification analysis, reveals that the occurrence and duration of vortex shedding interruptions are random and that the duration of the interruptions are shorter that the intervals of regular shedding. Furthermore, a recurrence plot based conditional averaging strategy is used allowing for the spatiotemporal evolution of the wake centreline to be visualised and for the wake convection speed to be calculated. The latter was found to be distributed normally around 0.66 of the free stream velocity. Classic detection and tracking of the trailing edge vortices revealed a formation length of � 20% of the airfoil chord length downstream of the trailing edge before alternately shedding can occur through mutual interactions of the upper and lower shear layer.

Item URL in elib:https://elib.dlr.de/110650/
Document Type:Conference or Workshop Item (Speech)
Title:Analysis of intermittent trailing edge vortex shedding using recurrence plots
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Mulleners, KarenEPFL, LausanneUNSPECIFIED
Rütten, Markusmarkus.ruetten (at) dlr.deUNSPECIFIED
Date:2016
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:PIV, Vortex Shedding, POD, recurrence plots
Event Title:18th International Symposium on the Applications of Laser and Imaging Techniques to Fluid Mechanics
Event Location:Lisbon, Portugal
Event Type:international Conference
Event Dates:04.-07. Juli 2016
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation and Validation
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > High Speed Configurations
Deposited By: Bachmann, Barbara
Deposited On:13 Jan 2017 14:49
Last Modified:13 Jan 2017 14:49

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