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Helmholtz Resonator Liner with Flexible Walls

Knobloch, Karsten and Enghardt, L. and Bake, Friedrich (2018) Helmholtz Resonator Liner with Flexible Walls. In: AIAA AVIATION 2018. 24th AIAA/CEAS Aeroacoustics Conference, 25.-29. June 2018, Atlanta, Georgia, USA. DOI: 10.2514/6.2018-4102

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In this experimental investigation, a novel liner concept (FlexiS) has been introduced and tested. An increased overall damping performance and an increased frequency range of significant damping mainly at lower frequencies could be obtained by replacing some of the rigid walls of an SDOF liner by exible materials with inherent damping. The concepts proved its benefits if some non-active parts (i.e. no direct connection to the grazing sound field) were placed between the active cells. Measurements of the dissipated acoustic energy of the whole liner and of the acoustic pressure inside neighboring cells reveal the importance of the exible walls. In the current investigation, the arrangement of active (open) and non-active (taped) cells allowed for a great exibility in liner setup without comprehensive changes or re-manufacturing of the liner. However, in terms of an efficient damping of acoustic energy, this setup represents a loss in active damping surface. Therefore, future works needs to address the in uence and requirements for the non-active parts (required size, coupling between neighboring non-active cavities, etc.) in order to find an efficient arrangement and investigate the actual de ection of the exible walls with the final aim of modeling liners with exible structures accurately.

Item URL in elib:https://elib.dlr.de/120829/
Document Type:Conference or Workshop Item (Speech)
Title:Helmholtz Resonator Liner with Flexible Walls
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Knobloch, KarstenKarsten.Knobloch (at) dlr.dehttps://orcid.org/0000-0002-3424-0809
Bake, FriedrichFriedrich.Bake (at) dlr.dehttps://orcid.org/0000-0002-3235-428X
Date:June 2018
Journal or Publication Title:AIAA AVIATION 2018
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
DOI :10.2514/6.2018-4102
Keywords:Novel liner concepts, broadband damping
Event Title:24th AIAA/CEAS Aeroacoustics Conference
Event Location:Atlanta, Georgia, USA
Event Type:international Conference
Event Dates:25.-29. June 2018
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:09 Jul 2018 09:41
Last Modified:09 Jul 2018 09:41

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