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Passive hypersonic boundary layer control by means of ultrasonically absorptive carbon-carbon ceramics: Investigations of different boundary conditions

Wartemann, Viola and Wagner, Alexander and Eggers, Thino and Hannemann, Klaus (2015) Passive hypersonic boundary layer control by means of ultrasonically absorptive carbon-carbon ceramics: Investigations of different boundary conditions. 20th AIAA International Space Planes and Hypersonic Systems and Technologies Conference, 06. - 09. July 2015, Glasgow, United Kingdom.

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Abstract

The influence of carbon fiber reinforced carbon ceramic (C/C) surfaces on hypersonic boundary layer instabilities is analysed numerically using the stability code NOLOT, NOn-Local Transition analysis code, of the German Aerospace Center (DLR). Experimental investigations in the DLR High Enthalpy Shock Tunnel Göttingen, HEG, show that C/C surfaces can be utilized to damp acoustic second mode instabilities, which results in a delay of boundary layer transition onset. The investigated geometry is a blunt 7° half-angle cone model with a nose radius of 2.5 mm and a total length of about 1 m. One-third of the metallic model surface in circumferential direction was replaced by C/C ceramics. In this paper different approaches for the formulation of the boundary conditions in NOLOT, modeling the acoustic damping properties of the C/C material, are analysed and compared with the experimental results.

Item URL in elib:https://elib.dlr.de/97227/
Document Type:Conference or Workshop Item (Speech)
Title:Passive hypersonic boundary layer control by means of ultrasonically absorptive carbon-carbon ceramics: Investigations of different boundary conditions
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Wartemann, Violaviola.wartemann (at) dlr.deUNSPECIFIED
Wagner, Alexanderalexander.wagner (at) dlr.deUNSPECIFIED
Eggers, Thinothino.eggers (at) dlr.deUNSPECIFIED
Hannemann, Klausklaus.hannemann (at) dlr.deUNSPECIFIED
Date:2015
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:ultrasonically absorptive coating; transition control; passive hypersonic boundary layer transition control; second mode damping; carbon fiber reinforced carbon ceramic (C/C); porous surface; random microstructure; cone experiments; stability analysis
Event Title:20th AIAA International Space Planes and Hypersonic Systems and Technologies Conference
Event Location:Glasgow, United Kingdom
Event Type:international Conference
Event Dates:06. - 09. July 2015
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 - Shefex III
Location: Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Spacecraft
Deposited By: Wartemann, Viola
Deposited On:27 Jul 2015 10:03
Last Modified:27 Jul 2015 10:03

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