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On the Noise Generation of Krueger Leading Edge Devices

Pott-Pollenske, Michael and Wild, Jochen and Almoneit, Daniela (2015) On the Noise Generation of Krueger Leading Edge Devices. 21. AIAA / CEAS Aeroacoustics Conference, 22. - 26. Juni 2015, USA.

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Abstract

Krueger type leading edge devices are appropriate means to ensure the necessary high lift performance for laminar wing concepts that are currently under investigation in order to reduce the environmental impact of transport aircraft in terms of COx and NOx emissions. If at the same time community noise levels would increase due to the use of Krueger leading edge devices the effort to reduce the environmental impact of aircraft would be partly contradicted. In view of the above initial noise measurements on a 3-dimensional semi-span wind tunnel model were conducted in order to (i) characterize the noise generated by a Krueger device and (ii) to compare the airframe noise contribution of a Krueger device with a conventional slat under similar aerodynamic conditions. Two different Krueger designs were noise tested in the anechoic open test section of DNW’s low speed wind tunnel Braunschweig. The so called reference Krueger flap has a short chord, a steep deployment angle and a negative overlap while the configuration named optimized Krueger features a long chord, a shallower deployment angle and a positive overlap of the Krueger trailing edge over the wing leading edge. The aerodynamic and acoustic study reveale, that Krueger noise compares well to slat noise in terms of maximum noise levels and spectral shape. Furthermore Krueger generated noise dominates the high lift system related airframe noise component. This first outcome of this DLR-internal study demands first of all strong efforts to minimize Krueger noise right from the beginning. Second, it was demonstrated that a long chord Krueger with positive overlap and moderate deflection angle serves provides a significant up to 5 dB noise reductions compared to the reference Krueger and the conventional slat.

Item URL in elib:https://elib.dlr.de/101862/
Document Type:Conference or Workshop Item (Speech)
Title:On the Noise Generation of Krueger Leading Edge Devices
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Pott-Pollenske, Michaelmichael.pott-pollenske (at) dlr.deUNSPECIFIED
Wild, Jochenjochen.wild (at) dlr.deUNSPECIFIED
Almoneit, Danieladaniela.almoneit (at) dlr.deUNSPECIFIED
Date:June 2015
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Airframe Noise, Leading Edge, Slat, Krueger
Event Title:21. AIAA / CEAS Aeroacoustics Conference
Event Location:USA
Event Type:international Conference
Event Dates:22. - 26. Juni 2015
Organizer:AIAA / 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 - Flight Physics
Location: Braunschweig
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Technical Acoustics
Institute of Aerodynamics and Flow Technology > Transport Aircraft
Deposited By: Pott-Pollenske, Stephan-Michael
Deposited On:08 Jan 2016 13:57
Last Modified:08 Jan 2016 13:57

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