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Examination of the influence of altitude and speed on fuselage hull excitation parameters induced by the turbulent boundary layer at cruise flight conditions

Haxter, Stefan and Spehr, Carsten (2013) Examination of the influence of altitude and speed on fuselage hull excitation parameters induced by the turbulent boundary layer at cruise flight conditions. American Institute of Aeronautics and Astronautics. 19th AIAA/CEAS Aeroacoustics Conference (34th AIAA Aeroacoustics Conference), 27. - 29. May 2013, Berlin, Germany.

Full text not available from this repository.

Official URL: http://arc.aiaa.org | DOI: 10.2514/6.2013-2028

Abstract

A flight test was conducted and the data was evaluated in order to investigate the influence of flight altitude and flight speed on the coherence length model by Efimtsov. An underestimation of the measured values by the model was found below a frequency of 1kHz. Above this frequency, the predicted values matched the measured values very well. The Efimtsov ansatz was found to be suitable for the description of coherence length, when the parameters are adapted. Three further analyses were performed: the flight speed was varied with constant altitude, the altitude was varied with constant flight speed, and both speed & altitude were varied together. No considerable variation was measured when the flight speed was varied separately. A small variation was determined at low frequency when the flight altitude was altered separately. When varying the parameters together, a distinct variation was found for the cases of highest speed and altitude. The applicability of the exponential coherence decay was analyzed. The absolute deviation was found to increase with lower frequency. The characteristic of the deviation was found to collapse in different regions with different scaling of the strouhal number.

Item URL in elib:https://elib.dlr.de/77817/
Document Type:Conference or Workshop Item (Speech, Paper)
Additional Information:DOI: 10.2514/6.2013-2028
Title:Examination of the influence of altitude and speed on fuselage hull excitation parameters induced by the turbulent boundary layer at cruise flight conditions
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Haxter, StefanUNSPECIFIEDUNSPECIFIED
Spehr, CarstenUNSPECIFIEDUNSPECIFIED
Date:2013
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-15
Publisher:American Institute of Aeronautics and Astronautics
Series Name:Conference Proceedings online
Status:Published
Keywords:turbulent boundary layer, coherence length model,
Event Title:19th AIAA/CEAS Aeroacoustics Conference (34th AIAA Aeroacoustics Conference)
Event Location:Berlin, Germany
Event Type:international Conference
Event Dates:27. - 29. May 2013
Organizer:American Institute of Aeronautics and Astronautics
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:22 Aug 2013 13:32
Last Modified:22 Aug 2013 13:32

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