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Experimental and numerical acoustic characterization of ultrasonically absorptive porous materials

Wagner, Alexander and Martinez Schramm, Jan and Dittert, Christian and C. B. Sousa, Victor and Patel, Danish and Scalo, Carlo (2018) Experimental and numerical acoustic characterization of ultrasonically absorptive porous materials. In: 12th AIAA/ASME Joint Thermophysics and Heat Transfer Conference, 2018. AIAA Aviation and Aeronautics Forum and Exposition 2018, 2018-06-25 - 2018-06-29, Atlanta, USA. doi: 10.2514/6.2018-2948.

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Official URL: http://www.aiaa.org/EventDetail.aspx?id=15032387957

Abstract

The paper addresses the experimental and numerical acoustic characterization of ultrasonically absorptive porous materials with random microstructure such as carbon fiber reinforced carbon ceramic C/C or C/C-SiC. The present study carries on a preceding experimental study of the authors by improving and extending the established experimental method and by conducting complementary numerical studies. The latter uses a new inverse Helmholtz Solver associated with an incident planar acoustic wave to estimate the complex acoustic impedance at the open surface of an arbitrarily shaped cavity. The experimental approach is complemented by high speed schlieren visualization and Mach-Zehnder Interferometer measurements to qualitatively and quantitatively assess the interaction between an ultrasonic wave packet and a porous surface. The main emphasis of the paper is to assess the potential and the limitations of the experimental methods and the comparison of the experimental results to the numerically obtained absorption characteristics.

Item URL in elib:https://elib.dlr.de/119025/
Document Type:Conference or Workshop Item (Speech)
Title:Experimental and numerical acoustic characterization of ultrasonically absorptive porous materials
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Wagner, AlexanderUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Martinez Schramm, JanUNSPECIFIEDhttps://orcid.org/0000-0002-8891-6253UNSPECIFIED
Dittert, ChristianUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
C. B. Sousa, VictorSchool of Mechanical Engineering, Purdue University, West Lafayette, USAUNSPECIFIEDUNSPECIFIED
Patel, DanishSchool of Mechanical Engineering, Purdue University, West Lafayette, USAUNSPECIFIEDUNSPECIFIED
Scalo, CarloSchool of Mechanical Engineering, Purdue University, West Lafayette, USAUNSPECIFIEDUNSPECIFIED
Date:2018
Journal or Publication Title:12th AIAA/ASME Joint Thermophysics and Heat Transfer Conference, 2018
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
DOI:10.2514/6.2018-2948
Status:Published
Keywords:Hypersonic Boundary-Layer Transition, HEG, ultrasonically absorptive coating, porous materials, acoustic absorption
Event Title:AIAA Aviation and Aeronautics Forum and Exposition 2018
Event Location:Atlanta, USA
Event Type:international Conference
Event Start Date:25 June 2018
Event End Date:29 June 2018
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Transportation
DLR - Research area:Raumfahrt
DLR - Program:R RP - Space Transportation
DLR - Research theme (Project):R - Raumfahrzeugsysteme - Anlagen u. Messtechnik (old)
Location: Göttingen , Stuttgart
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Spacecraft, GO
Institute of Structures and Design > Space System Integration
Deposited By: Bachmann, Barbara
Deposited On:06 Jul 2018 11:38
Last Modified:24 Apr 2024 20:23

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