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Theory and Application of an Analytical Approach for the Determination of the Transmission of Sound Waves through a Turbomachinery Stator

Puttkammer, Peter and Behn, Maximilian and Tapken, Ulf and Thouault, Nicolas and Hagmeijer, Rob (2016) Theory and Application of an Analytical Approach for the Determination of the Transmission of Sound Waves through a Turbomachinery Stator. In: Fortschritte der Akustik - DAGA 2016. 42. Jahrestagung für Akustik DAGA 2016, 14.-17. März 2016, Aachen.

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Official URL: https://www.dega-akustik.de/publikationen/online-proceedings/

Abstract

The application of the two-dimensional aeroacoustic blade row model of Smith [1] to stators of axial turbomachines is investigated in detail. The study is part of an on-going research project including the verification of the model by comparison with data from experiments and from CFD/CAA codes. The overall objective is the accurate prediction of the transmission and reflection of sound waves, which is of large interest with regard to the pre-design of turbomachinery blade rows. The underlying concepts, related to the wave number, the phase velocity and the group velocity of the incoming 2D plane waves, are examined thoroughly. The 2D blade row model is applied to predict the sound transmission and reflection through a 3D stator and outcomes are compared with results of the CFD code Lin3D provided by MTU Aero Engines. For the approximation of the sound waves and the geometry using the 2D model parameters different approaches are developed and discussed. It is shown that the accuracy of the prediction can be improved by incorporating the effect of the impedance jump that corresponds to the change in cross-sectional area due to the stator blades.

Item URL in elib:https://elib.dlr.de/109500/
Document Type:Conference or Workshop Item (Speech)
Title:Theory and Application of an Analytical Approach for the Determination of the Transmission of Sound Waves through a Turbomachinery Stator
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Puttkammer, PeterUniversity of TwenteUNSPECIFIED
Behn, Maximilianmaximilian.behn (at) dlr.deUNSPECIFIED
Tapken, Ulfulf.tapken (at) dlr.deUNSPECIFIED
Thouault, NicolasMTU Aero Engines AGUNSPECIFIED
Hagmeijer, RobUniversity of TwenteUNSPECIFIED
Date:March 2016
Journal or Publication Title:Fortschritte der Akustik - DAGA 2016
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Engine Acoustics, Sound transmission, reflection, scattering, Aero engines, Cascade model, flow deflection
Event Title:42. Jahrestagung für Akustik DAGA 2016
Event Location:Aachen
Event Type:national Conference
Event Dates:14.-17. März 2016
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Turbine Technologies, L - Fan and Compressor Technologies
Location: Berlin-Charlottenburg
Institutes and Institutions:Institute of Propulsion Technology > Engine Acoustic
Deposited By: Behn, Maximilian
Deposited On:04 Jan 2017 11:42
Last Modified:04 Jan 2017 13:42

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