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Innovative liner concept for enhanced acoustic damping: hybrid Zero Massflow Liner (ZML)

Bake, Friedrich and Bauer, Albert and Schulz, Anita and Knobloch, Karsten and Richter, C. and Enghardt, L. (2017) Innovative liner concept for enhanced acoustic damping: hybrid Zero Massflow Liner (ZML). In: AIAA JOURNAL (AIAA). 23rd AIAA/CEAS Aeroacoustics Conference, 05.-09. June 2016, Denver, Colorado, USA.

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Modern aero-engines require due to their architecture an enhanced damping performance of passive, acoustically absorbing wall treatment, called liner. The concept in thispaper aims on the improvement of the broadband damping compared to the narrow damping behavior of conventional Single-Degree-of-Freedom (SDOF) liner. This study investi- gates a new liner concept based on an additional acoustical excitation of the liner cavity below the liner face sheet. This so-called Zero-Mass ow-liner (ZML) concept was investigated earlier in the framework of combustion chamber liner design. Here, this concept was enhanced by combining a single cavity ZML liner with a honeycomb-structured SDOF liner yielding a hybrid ZML liner concept. Within this work, this concept was investigated in detail focusing on different parameters like the cavity excitation amplitude, the face sheet porosity and the grazing flow in uence. In conclusion, the hybrid ZML concept reveals a signiffcant potential for increased broadband dissipation behavior due to an additional damping effect based on the periodically excited flow through the liner facesheet.

Item URL in elib:https://elib.dlr.de/113369/
Document Type:Conference or Workshop Item (Speech)
Title:Innovative liner concept for enhanced acoustic damping: hybrid Zero Massflow Liner (ZML)
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Bake, FriedrichFriedrich.Bake (at) dlr.dehttps://orcid.org/0000-0002-3235-428X
Schulz, Anitadlr, at-traUNSPECIFIED
Knobloch, KarstenKarsten.Knobloch (at) dlr.dehttps://orcid.org/0000-0002-3424-0809
Richter, C.rolls-royce deutschland, dahlewitz, germanyUNSPECIFIED
Date:June 2017
Journal or Publication Title:AIAA JOURNAL
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Keywords:innovative liner concepts; hybrid Zero Massflow Liner (ZML)
Event Title:23rd AIAA/CEAS Aeroacoustics Conference
Event Location:Denver, Colorado, USA
Event Type:international Conference
Event Dates:05.-09. June 2016
Organizer:AIAA / CEAS
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
Location: Berlin-Charlottenburg
Institutes and Institutions:Institute of Propulsion Technology > Engine Acoustic
Deposited By: Bake, Dr.-Ing. Friedrich
Deposited On:27 Jul 2017 09:31
Last Modified:07 Feb 2018 15:54

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