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Investigation of laminar detachment by means of simultaneous microphone and surface hot wire measurements

Ahlefeldt, Thomas and Sopranzetti, Francesca and Spehr, Carsten and Henning, Arne (2013) Investigation of laminar detachment by means of simultaneous microphone and surface hot wire measurements. American Institute of Aeronautics and Astronautics. 19th AIAA/CEAS Aeroacoustics Conference, 27. - 29. May 2013, Berlin, Germany.

Full text not available from this repository.

Official URL: http://arc.aiaa.org | DOI: 10.2514/6.2013-2109

Abstract

An experimental study on the acoustic characterization of the laminar separation bubble on an airfoil is presented. The acoustic near- and far-fields are sampled by means of microphone arrays. Additionally the wall shear stresses are measured on the airfoil suction side by means of 24 MEMS surface hot wires in the region where the separation bubble was expected. Dierent processing strategies both in the frequency and in the time domain were applied for an acoustic characterization of the bubble. A focus of the study presented here is the application of the so called causality correlation method. The wall shear stresses on the airfoil surface together with the pressure fluctuations in the near- and far-field are recorded simultaneously. This enables the calculation of the cross-correlation between the measured quantities. An analysis of the resulting coecient matrix in the space-time domain identies perturbations traveling along the airfoil, showing a linear dependency on the sound generating process. For the case of the correlation between the wall shear stresses on the airfoil and the pressure fluctuations in the far-field the validity of the results were improved signicantly by using the focused pressure signals from the microphone-array.

Item URL in elib:https://elib.dlr.de/81931/
Document Type:Conference or Workshop Item (Speech, Paper)
Additional Information:DOI: 10.2514/6.2013-2109
Title:Investigation of laminar detachment by means of simultaneous microphone and surface hot wire measurements
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ahlefeldt, ThomasUNSPECIFIEDUNSPECIFIED
Sopranzetti, FrancescaUniversità Politecnica delle Mrche, Anona, ItalyUNSPECIFIED
Spehr, CarstenUNSPECIFIEDUNSPECIFIED
Henning, ArneUNSPECIFIEDUNSPECIFIED
Date:2013
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-12
Publisher:American Institute of Aeronautics and Astronautics
Series Name:Conference Porceedings online
Status:Published
Keywords:simultaneous microphone, microphone array, cross-correlation
Event Title:19th AIAA/CEAS Aeroacoustics Conference
Event Location:Berlin, Germany
Event Type:international Conference
Event Dates:27. - 29. May 2013
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
Institute of Aerodynamics and Flow Technology > Fluid Systems
Deposited By: Micknaus, Ilka
Deposited On:22 Aug 2013 13:30
Last Modified:22 Aug 2013 13:30

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