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Active control of turbulent flow separation over a backwardfacing step using acoustic tube.

Ma, Xingyu and Schröder, Andreas and Geisler, Reinhard and Agocs, Janos (2013) Active control of turbulent flow separation over a backwardfacing step using acoustic tube. 16. STAB-Workshop, Göttingen, Deutschland.

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Official URL: http://www.dlr.de/agstab

Abstract

flow and the effect was investigated experimentally. Different periodic perturbations were introduced into the turbulent shear flow. Planar particle image velocimetry (PIV) was employed to measure the separated flow as well as the reattachment area downstream. The time-averaged and phase-averaged flow fields were obtained and the Reynolds stresses in clean and controlled cases were compared. It has been shown that in the controlled case the flow separation was suppressed and the reattachment length was reduced by as much as 47.6%. Furthermore, The method of proper orthogonal decomposition (POD) was applied to the flow fields to extract large-scale coherent flow structures. The resulting phase-averaged motions of main POD modes provides more insight into the evolution of the shedding vortices as well as the interaction between the mean and oscillating flow fields.

Item URL in elib:https://elib.dlr.de/84812/
Document Type:Conference or Workshop Item (Speech)
Title:Active control of turbulent flow separation over a backwardfacing step using acoustic tube.
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ma, XingyuUNSPECIFIEDUNSPECIFIED
Schröder, AndreasUNSPECIFIEDUNSPECIFIED
Geisler, ReinhardUNSPECIFIEDUNSPECIFIED
Agocs, JanosUNSPECIFIEDUNSPECIFIED
Date:2013
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:STAB-Mitteilung 2013
Page Range:pp. 34-35
Series Name:Jahresbericht 2013
Status:Published
Keywords:turbulent flow, particle image velocimetry (PIV), flow fields
Event Title:16. STAB-Workshop
Event Location:Göttingen, Deutschland
Event Type:Workshop
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research (old)
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation & Validation (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Experimental Methods
Deposited By: Micknaus, Ilka
Deposited On:18 Nov 2013 16:33
Last Modified:08 May 2014 23:19

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