Sousa, Victor C. B. und Patel, Danish und Chapelier, J.-B. und Wagner, Alexander und Scalo, Carlo (2018) Numerical Investigation of Second Mode Attenuation over Carbon/Carbon Surfaces on a Sharp Slender Cone. In: 56th AIAA Aerospace Sciences Meeting. AIAA Science and Technology Forum and Exposition (SciTech 2018), 2018-01-08 - 2018-01-11, Kissimee, Florida USA. doi: 10.2514/6.2018-0350. ISBN 978-162410524-1.
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Kurzfassung
Axisymmetric numerical simulations of a spatially developing hypersonic boundary layer over a sharp 7°-half-angle cone at M= 7.5, inspired by the experimental investigations by Wagner (2015), were carried out. Simulations are first performed with impermeable (or solid) walls with a one-time broadband pulse excitation applied upstream to determine the most convectively-amplified frequencies resulting in the range 260kHz - 400kHz, consistent with experimental observations of second-mode instability waves. Subsequently, we introduce harmonic disturbances via continuous periodic suction and blowing at 270 kHz and 350 kHz. For each of these forcing frequencies complex impedance boundary conditions (IBC), modeling the acoustic response of two different carbon/carbon (C/C) ultrasonically absorptive porous surfaces, are applied at the wall. The IBCs are derived as an output of a pore-scale aeroacoustic analysis - the inverse Helmholtz Solver (iHS) - which is able to return the broadband real and imaginary components of the surface-averaged impedance. The introduction of the IBCs in all cases leads to a significant attenuation of the harmonically-forced second-mode wave. In particular, we observe a higher attenuation rate of the introduced waves with frequency of 350 kHz in comparison with 270 kHz, and, along with the iHS impedance results, we establish that the C/C surfaces absorb acoustic energy more effectively at higher frequencies.
elib-URL des Eintrags: | https://elib.dlr.de/119061/ | ||||||||||||||||||||||||
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Dokumentart: | Konferenzbeitrag (Vortrag) | ||||||||||||||||||||||||
Titel: | Numerical Investigation of Second Mode Attenuation over Carbon/Carbon Surfaces on a Sharp Slender Cone | ||||||||||||||||||||||||
Autoren: |
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Datum: | 2018 | ||||||||||||||||||||||||
Erschienen in: | 56th AIAA Aerospace Sciences Meeting | ||||||||||||||||||||||||
Referierte Publikation: | Ja | ||||||||||||||||||||||||
Open Access: | Nein | ||||||||||||||||||||||||
Gold Open Access: | Nein | ||||||||||||||||||||||||
In SCOPUS: | Ja | ||||||||||||||||||||||||
In ISI Web of Science: | Nein | ||||||||||||||||||||||||
DOI: | 10.2514/6.2018-0350 | ||||||||||||||||||||||||
ISBN: | 978-162410524-1 | ||||||||||||||||||||||||
Status: | veröffentlicht | ||||||||||||||||||||||||
Stichwörter: | hypersonic boundary-layer transition, ultrasonically absorptive coating, porous materials, acoustic absorption, UAT | ||||||||||||||||||||||||
Veranstaltungstitel: | AIAA Science and Technology Forum and Exposition (SciTech 2018) | ||||||||||||||||||||||||
Veranstaltungsort: | Kissimee, Florida USA | ||||||||||||||||||||||||
Veranstaltungsart: | internationale Konferenz | ||||||||||||||||||||||||
Veranstaltungsbeginn: | 8 Januar 2018 | ||||||||||||||||||||||||
Veranstaltungsende: | 11 Januar 2018 | ||||||||||||||||||||||||
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 - Wiederverwendbare Raumfahrtsysteme und Antriebstechnologie | ||||||||||||||||||||||||
Standort: | Göttingen | ||||||||||||||||||||||||
Institute & Einrichtungen: | Institut für Aerodynamik und Strömungstechnik > Raumfahrzeuge, GO | ||||||||||||||||||||||||
Hinterlegt von: | Bachmann, Barbara | ||||||||||||||||||||||||
Hinterlegt am: | 08 Mai 2018 14:37 | ||||||||||||||||||||||||
Letzte Änderung: | 24 Apr 2024 20:23 |
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