elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

APU-NOISE REDUCTION BY NOVEL MUFFLER CONCEPTS

Knobloch, Karsten and Enghardt, L. and Bake, Friedrich (2018) APU-NOISE REDUCTION BY NOVEL MUFFLER CONCEPTS. In: Proceedings of the ASME Turbo Expo. ASME Turbo Expo 2018, 11.-15. Jun. 2018, Oslo, Norway.

Full text not available from this repository.

Abstract

For a GTCP36-28 auxiliary power unit (APU), a set of mufflers has been designed and tested for some representative operating conditions. The first muffler design uses cavities of different sizes in conjunction with a bias flow for efficient broadband sound absorption. The second design - also expected to perform well over a large frequency range - makes use of a variable perforation and some porous absorber material. The acoustic damping performance of the mufflers was assessed using a downstream section of dedicated microphone probes. Individual spectra and circumferential averages have been computed and are used for a comparison to a hard-walled duct section of the same length. Results show a reasonable broadband absorption for most configurations. For one operating point, significant differences were found while comparing the performance of the cavity muffler with and without bias flow. The results suggest, that a small amount of air - less than initially expected - is sufficient to obtain the desired noise reduction.

Item URL in elib:https://elib.dlr.de/120479/
Document Type:Conference or Workshop Item (Speech)
Additional Information:Paper-Number GT2018-76762
Title:APU-NOISE REDUCTION BY NOVEL MUFFLER CONCEPTS
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Knobloch, KarstenKarsten.Knobloch (at) dlr.dehttps://orcid.org/0000-0002-3424-0809
Enghardt, L.lars.enghardt (at) dlr.deUNSPECIFIED
Bake, FriedrichFriedrich.Bake (at) dlr.dehttps://orcid.org/0000-0002-3235-428X
Date:June 2018
Journal or Publication Title:Proceedings of the ASME Turbo Expo
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Status:Published
Keywords:APU, muffler, noise reduction, bias flow
Event Title:ASME Turbo Expo 2018
Event Location:Oslo, Norway
Event Type:international Conference
Event Dates:11.-15. Jun. 2018
Organizer:ASME
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 - Combustion Chamber Technologies
Location: Berlin-Charlottenburg
Institutes and Institutions:Institute of Propulsion Technology > Engine Acoustic
Deposited By: Knobloch, Dr. Karsten
Deposited On:20 Jun 2018 12:30
Last Modified:11 Jul 2018 09:04

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.