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Active Flow Control Applied at the Engine-Wing Junction

Fricke, Sebastian and Ciobaca, Vlad and Kröhnert, Anna and Wild, Jochen and Blesbois, Olivier (2015) Active Flow Control Applied at the Engine-Wing Junction. 5th CEAS Air and Space Coneference, 7.-12. Sept. 2015, Delft, Niederlande.

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Official URL: http://www.ceas2015.org/

Abstract

The integration of UHBR (Ultra High Bypass Ratio) engines mounted under backward swept wings may lead at low speed to local flow separations on the wing suction side in the wake of the nacelle. These local flow separations can trigger the total wing stall which degrades the total aircraft performance. This paper presents a numerical study of AFC (active flow control) applied at the engine-wing junction of a generic full scale wind tunnel model to suppress the local flow separations. The AFC method is based on the principle of fluidic actuation and assembles a pulsed blowing with a 180° phase shift between the neighboring nozzles. Its working principle is the production of vortices that enhance the mixing of the boundary layer and the free stream flow. The free stream flow in the wake of the nacelle is compromised due to the wakes of local flow separations and longitudinal vortices such as the strake vortex. The computation results show that pulsed blowing is capable of suppressing the local separations. It is shown that a certain blowing velocity exists that is required for the suppression of the nacelle-wake separation. Additionally the influence of the pulse frequency was analyzed with a parameter study. It was shown that the local flow separations were suppressed by both low and high pulse frequencies.

Item URL in elib:https://elib.dlr.de/100052/
Document Type:Conference or Workshop Item (Speech)
Title:Active Flow Control Applied at the Engine-Wing Junction
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Fricke, Sebastiansebastian.fricke (at) dlr.deUNSPECIFIED
Ciobaca, Vladvlad.ciobaca (at) dlr.deUNSPECIFIED
Kröhnert, Annaanna.kroehnert (at) dlr.deUNSPECIFIED
Wild, Jochenjochen.wild (at) dlr.deUNSPECIFIED
Blesbois, OlivierAGIUNSPECIFIED
Date:September 2015
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Active Flow Control, Transport Aircraft, High-Lift, Engine-Wing Junction, uRANS
Event Title:5th CEAS Air and Space Coneference
Event Location:Delft, Niederlande
Event Type:international Conference
Event Dates:7.-12. Sept. 2015
Organizer:CEAS
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: Braunschweig
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Transport Aircraft
Deposited By: Ciobaca, Vlad
Deposited On:07 Dec 2015 15:25
Last Modified:07 Dec 2015 15:25

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