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Passive hypersonic boundary layer transition control using an ultrasonically absorptive coating with random microstructure: Computational analysis based on the ultrasonic absorption properties of carbon-carbon

Wartemann, Viola und Wagner, Alexander und Kuhn, Markus und Eggers, Thino und Hannemann, Klaus (2015) Passive hypersonic boundary layer transition control using an ultrasonically absorptive coating with random microstructure: Computational analysis based on the ultrasonic absorption properties of carbon-carbon. Procedia IUTAM, 14 (-). ELSEVIER. doi: 10.1016/j.piutam.2015.03.068. ISSN 2210-9838.

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Offizielle URL: http://www.sciencedirect.com/science/article/pii/S2210983815000942

Kurzfassung

Previous investigations in the High Enthalpy Shock Tunnel Göttingen of the German Aerospace Center (DLR) show that carbon fiber reinforced carbon ceramic (C/C) surfaces can be utilized to damp hypersonic boundary layer instabilities resulting in a delay of boundary layer transition onset. Linear stability analyses were performed using the DLR stability code NOLOT, NOnLocal Transition analysis code. To adapt the boundary condition to account for the characteristics of porous C/C material, the ultrasonic absorption properties of C/C were investigated experimentally and theoretically. Therefore, a test rig was set up to directly measure the reflection coefficient in the frequency and pressure range corresponding to the test conditions in HEG. In this frame, the reflection of ultrasonic waves from flat plate test samples with different porous layer thicknesses was investigated and compared to an ideally reflecting surface. The obtained results were used to improved the boundary condition used for stability analysis above porous surfaces. The numerical results, using the original as well as the improved boundary condition, were compared with wind tunnel tests. These experiments were performed at Mach 7.5 and different unit Reynolds numbers. A 7∘ half-angle cone model with a nose radius of 2.5 mm and a total length of 1077 mm was used. One-third of the metallic model surface in circumferential direction was replaced by C/C ceramics. The comparison between numeric and experiments includes the investigations of the second modes, the damping of the these modes and the resulting transition shift.

elib-URL des Eintrags:https://elib.dlr.de/101331/
Dokumentart:Tagungsband
Titel:Passive hypersonic boundary layer transition control using an ultrasonically absorptive coating with random microstructure: Computational analysis based on the ultrasonic absorption properties of carbon-carbon
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Wartemann, Violaviola.wartemann (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Wagner, Alexanderalexander.wagner (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Kuhn, Markusmarkus.kuhn (at) dlr.dehttps://orcid.org/0000-0002-0633-2327NICHT SPEZIFIZIERT
Eggers, Thinothino.eggers (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Hannemann, Klausklaus.hannemann (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:2015
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Band:14
DOI:10.1016/j.piutam.2015.03.068
Seitenbereich:Seiten 412-421
Verlag:ELSEVIER
Name der Reihe:Procedia IUTAM
ISSN:2210-9838
Status:veröffentlicht
Stichwörter: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
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Raumtransport
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R RP - Raumtransport
DLR - Teilgebiet (Projekt, Vorhaben):R - Shefex III (alt)
Standort: Braunschweig , Göttingen , Stuttgart
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > Raumfahrzeuge
Institut für Bauweisen und Strukturtechnologie > Raumfahrt - System - Integration
Hinterlegt von: Seyfried, Beate
Hinterlegt am:18 Dez 2015 08:35
Letzte Änderung:24 Apr 2024 20:06

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