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Investigation of the Acoustic Nearfield of a Transonic-Fanstage by Time-Domain CFD-Calculations with Arbitrary Blade Counts

Schnell, R. (2004) Investigation of the Acoustic Nearfield of a Transonic-Fanstage by Time-Domain CFD-Calculations with Arbitrary Blade Counts. ASME Turbo-Expo 2004, 7.-14. Juni 2004, Wien/Österreich.

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Abstract

In order to investigate the tonal noise generated by viscous blade/vane interaction in a typical transonic bypass engine fan stage, time domain calculations were carried out with the non-linear Navier-Stokes solver TRACE. The propagating acoustic field was obtained by a modal decomposition of near field flow data. Comparisons with available experimental data in the bypass duct casing are presented. Different OGV designs of the investigated fanstage were evaluated with respect to the emitted tonal noise of the stage. To ensure the correct modal structure of the acoustic field it is vital to employ the correct blade count ratio in numerical simulations. To accomplish this efficiently, phase-lagged boundary conditions were incorporated into the employed flow solver. The method has been validated using a counter-rotating propfan configuration and was then applied for the three dimensional, spatially highly resolved fanstage calculation.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=2004, monograph_id=2004-GT-54216,
Title:Investigation of the Acoustic Nearfield of a Transonic-Fanstage by Time-Domain CFD-Calculations with Arbitrary Blade Counts
Authors:
AuthorsInstitution or Email of Authors
Schnell, R.UNSPECIFIED
Date:2004
Status:Published
Event Title:ASME Turbo-Expo 2004, 7.-14. Juni 2004, Wien/Österreich
Organizer:ASME
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:other
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:no assignment
DLR - Research theme (Project):UNSPECIFIED
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology
Deposited By: Dr.-Ing. Rainer Schnell
Deposited On:16 Sep 2005
Last Modified:06 Jan 2010 13:29

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