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Passive hypersonic boundary layer transition control using an ultrasonically absorptive coating with random microstructure - Part 1: Ultrasonic absorption properties of carbon-carbon

Wagner, Alexander and Kuhn, Markus and Wartemann, Viola and Hannemann, Klaus (2014) Passive hypersonic boundary layer transition control using an ultrasonically absorptive coating with random microstructure - Part 1: Ultrasonic absorption properties of carbon-carbon. In: Procedia IUTAM, pp. 1-4. IUTAM ABCM Symposium on Laminar Turbulent Transition, 08. - 12. Sept. 2014, Rio de Janeiro, Brazil.

Full text not available from this repository.

Official URL: http://www.journals.elsevier.com/procedia-iutam

Abstract

Hypersonic boundary layer transition control offers the potential to reduced surface heat flux rates and in consequence the reduction of the thermal protection system mass. Preceding studies have shown that ultrasonically absorptive carbon fiber reinforced carbon ceramic (C/C) with random microstructure can be applied to damp the second mode growth in hypersonic boundary layers and thus to delay boundary transition. To better understand the potential of C/C materials for use as passive transition control a test rig was set up to determine the acoustic absorption characteristics in absence of the external boundary layer flow. Various flat plate samples covered with porous carbon-carbon layers of different thickness were investigated in the range of 200 kHz to 400 kHz at ambient pressures between 5x103 Pa and 1x105 Pa. A set of piezo ceramic sound transducers were used as transmitter and receiver to generate and reveive the acoustic waves. All material properties necessary to predict the acoustic characteristics by means of acoustic porous absorbers theory are introduced. The predicted theoretical results are compared to the results obtained in the experiment.

Item URL in elib:https://elib.dlr.de/88437/
Document Type:Conference or Workshop Item (Other)
Title:Passive hypersonic boundary layer transition control using an ultrasonically absorptive coating with random microstructure - Part 1: Ultrasonic absorption properties of carbon-carbon
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Wagner, Alexanderalexander.wagner (at) dlr.deUNSPECIFIED
Kuhn, Markusmarkus.kuhn (at) dlr.deUNSPECIFIED
Wartemann, Violaviola.wartemann (at) dlr.deUNSPECIFIED
Hannemann, Klausklaus.hannemann (at) dlr.deUNSPECIFIED
Date:2014
Journal or Publication Title:Procedia IUTAM
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-4
Series Name:Book of Abstracts
Status:Published
Keywords:Hypersonic Boundary Layer Transition Control
Event Title:IUTAM ABCM Symposium on Laminar Turbulent Transition
Event Location:Rio de Janeiro, Brazil
Event Type:international Conference
Event Dates:08. - 12. Sept. 2014
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Transport
DLR - Research area:Raumfahrt
DLR - Program:R RP - Raumtransport
DLR - Research theme (Project):R - Raumfahrzeugsysteme - Anlagen u. Messtechnik
Location: Braunschweig , Göttingen , Stuttgart
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Spacecraft
Institute of Structures and Design > Space System Integration
Deposited By: Micknaus, Ilka
Deposited On:06 Nov 2014 09:22
Last Modified:19 Nov 2014 11:35

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