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OCTRA as ultrasonically absorptive thermal protection material for hypersonic transition suppression

Wartemann, Viola and Wagner, Alexander and Surujhlal, Divek and Dittert, Christian (2023) OCTRA as ultrasonically absorptive thermal protection material for hypersonic transition suppression. CEAS Space Journal. Springer. doi: 10.1007/s12567-023-00504-0. ISSN 1868-2502.

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Official URL: https://doi.org/10.1007/s12567-023-00504-0


Previous investigations in the High Enthalpy Shock Tunnel Göttingen (HEG) of the German Aerospace Center (DLR) show that carbon fber reinforced carbon ceramic (C/C) surfaces can be utilized to damp hypersonic boundary layer instabilities resulting in a delay of boundary layer transition onset. Numerical stability analyses confrmed these experimental results. However, C/C has some disadvantages, especially the limited oxidation resistance and its low mechanical strength, which could be critical during hypersonic fights. Thus, an ultrasonically absorptive fber reinforced ceramic material based on a silicon carbide (C/C-SiC) was developed in the past years to fulfll this need. The present paper addresses the numerical rebuilding of the C/C-SiC absorber properties using impedance boundary conditions together with linear stability analysis. The focus of this paper is on the numerical comparison of the original C/C material and the improved C/C-SiC material, referred to as OCTRA in the literature. The infuence on the second modes and the transition itself is investigated. The numerical results are compared with HEG wind tunnel tests. The wind tunnel model tested in HEG is a 7° half-angle blunted cone with an overall model length of about 1.1 m and a nose tip radius of 2.5 mm. These experiments were performed at Mach 7.5 and at diferent freestream unit Reynolds numbers.

Item URL in elib:https://elib.dlr.de/195371/
Document Type:Article
Title:OCTRA as ultrasonically absorptive thermal protection material for hypersonic transition suppression
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Wartemann, ViolaUNSPECIFIEDhttps://orcid.org/0000-0002-1920-3364UNSPECIFIED
Surujhlal, DivekUNSPECIFIEDhttps://orcid.org/0000-0002-0349-3328UNSPECIFIED
Date:June 2023
Journal or Publication Title:CEAS Space Journal
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Keywords:Ultrasonically absorptive thermal protection material, Hypersonic transition suppression, Stability analyses, Second mode instability, High Enthalpy Shock Tunnel Göttingen (HEG)
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 - Project ReFEx - Reusability Flight Experiment
Location: Braunschweig
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Spacecraft, BS
Institute for Aerodynamics and Flow Technology > Spacecraft, GO
Institute of Structures and Design > Space System Integration
Deposited By: Wartemann, Viola
Deposited On:07 Jun 2023 11:12
Last Modified:13 Jun 2023 11:53

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