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Engine Acoustics Department

Test rig for active noise-reduction of aero-engines
Berlin

Acting Department leader: Prof. Dr. Lars Enghardt

Müller-Breslau-Straße 8
D-10623 Berlin
Telefax: +49 30 310 006-39

Sekretariat:
Telefon: +49 30 310 006-18

The Department of Engine Acoustics in the Institute of Propulsion Technology of the German Aerospace Center (“Deutsches Zentrum fuer Luft und Raumfahrt”: DLR) focuses on unsteady processes in technical flows. Current research topics are the acoustics of turbo machines and solutions for reducing the noise of aero-engines, reduction of turbulence induced friction phenomena as well as the investigation and control of unsteady combustion processes.

The department maintains numerous contacts to engine and aircraft manufactures, to the Deutsche Bahn AG (the German Railway) and to government agencies. It participates in DFG (German Research Foundation) research programs and national as well as international research initiatives. These include the aeronautical research program of the German Federal Government, the environmental program aimed at developing a low-pollution aircraft engine and the European Framework Research Programs.

The department is located at the Institute of Fluid Mechanics and Technical Acoustics of the Technische Universität (TU) Berlin to which it is closely connected through a strong cooperation for decades.

The research groups within the department are subdivided as follows:

Numerik und Prognose

Akustische Modellierung von Triebwerkskomponenten an Hand semi-analytischer und numerischer Verfahren. Eine gezielte Anwendung der hier entwickelten Tools ist die akustische Auslegung neuartiger Triebwerkskomponenten: die Vorauslegung erfolgt mit Hilfe von semi-analytischen Modellen und die numerische Bewertung zur endgültigen Auslegung wird an Hand von CFD-CAA Tools durchgeführt.

Flow Control

Drag reduction with Riblets, lift increase of airfoils, control of secondary flow phenomena, vortex generators.

Noise Source Localization with Microphone Arrays

Noise source analysis of commercial airplanes and aero-engine test beds, localization and analysis of wake vortices, microphone array technology (acoustic camera).

Turbomachinery acoustics

Analysis of noise sources, tip clearance noise and rotating instabilities in axial turbomachines, acoustic mode analysis, sound generation in radial compressors, jet noise, active noise control.

Combustion chamber acoustics

Investigation of unsteady phenomena occurring in combustion systems, improvement of operation performance of combustion chambers by minimizing combustion instabilities and combustion noise, investigation of different combustion noise source mechanisms with laser-optical measurement techniques and acoustic mode analysis.

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