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Listening to Turbulence: Measuring Coherence Decay at Different Positions on an Aircraft in Cruise Flight

Haxter, Stefan and Spehr, Carsten (2014) Listening to Turbulence: Measuring Coherence Decay at Different Positions on an Aircraft in Cruise Flight. American Institute of Aeronautics and Astronautics. 20th AIAA/CEAS Aeroacoustics Conference, 16. - 20. June 2014, Atlanta, Georgia, USA.

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Official URL: http://arc.aiaa.org | DOI: 10.2514/6.2014-3064


The coherence lengths underneath a turbulent boundary layer were measured in flight at several positions on an aircraft. It was found that the coherence length scales with the boundary layer thickness, except for one measurement position where the boundary layer was believed to be disturbed by the vicinity of the wing. A comparison of the data with the models by Corcos and Efimtsov showed an underprediction of the values. However good applicability of the Efimtsov-theory was found when fitted to the measured data. A variation of flight speed and flight altitude showed no considerable change in the coherence length parameters. Variation of interior sound level is therefore not ascribed to a variation of coherence length, but rather to a variation of other parameters.

Item URL in elib:https://elib.dlr.de/85106/
Document Type:Conference or Workshop Item (Speech)
Additional Information:AIAA 2014-3064, 20th AIAA/CEAS Aeroacoustics Conference, DOI: 10.2514/6.2014-3064
Title:Listening to Turbulence: Measuring Coherence Decay at Different Positions on an Aircraft in Cruise Flight
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Haxter, StefanStefan.Haxter (at) dlr.deUNSPECIFIED
Spehr, CarstenCarsten.Spehr (at) dlr.deUNSPECIFIED
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 1-15
Publisher:American Institute of Aeronautics and Astronautics
Series Name:Conference Porceedings online
Keywords:Coherence Decay, Efimtsov Model, Corcos Model, Cruise Flight, Flight Test Measurement
Event Title:20th AIAA/CEAS Aeroacoustics Conference
Event Location:Atlanta, Georgia, USA
Event Type:international Conference
Event Dates:16. - 20. June 2014
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 > Experimental Methods
Deposited By: Micknaus, Ilka
Deposited On:18 Jul 2014 10:20
Last Modified:20 Oct 2014 13:27

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