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Numerical Investigation of Second Mode Attenuation over Carbon/Carbon Porous Surfaces

Sousa, Victor C. B. and Patel, Danish and Chapelier, J.-B. and Wagner, Alexander and Scalo, Carlo (2018) Numerical Investigation of Second Mode Attenuation over Carbon/Carbon Porous Surfaces. Journal of Spacecraft and Rockets, 210059. American Institute of Aeronautics and Astronautics (AIAA). DOI: 10.2514/6.2018-0350 ISBN ISBN: 978-162410524-1 ISSN 0022-4650

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Abstract

We have carried out 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). 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 270kHz and 350kHz. 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 350kHz in comparison with 270kHz, and, along with the iHS impedance results, we establish that the C/C surfaces absorb acoustic energy more effectively at higher frequencies. © 2018 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

Item URL in elib:https://elib.dlr.de/121421/
Document Type:Article
Title:Numerical Investigation of Second Mode Attenuation over Carbon/Carbon Porous Surfaces
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Sousa, Victor C. B.vsousa (at) purdue.eduUNSPECIFIED
Patel, DanishSchool of Mechanical Engineering, Purdue University, West Lafayette, USAUNSPECIFIED
Chapelier, J.-B.School of Mechanical Engineering, Purdue University, West Lafayette, USAUNSPECIFIED
Wagner, AlexanderAlexander.Wagner (at) dlr.dehttps://orcid.org/0000-0002-9700-1522
Scalo, Carloscalo (at) purdue.eduUNSPECIFIED
Date:November 2018
Journal or Publication Title:Journal of Spacecraft and Rockets
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:210059
DOI :10.2514/6.2018-0350
Editors:
EditorsEmail
UNSPECIFIEDAmerican Institute of Aeronautics and Astronautics Inc, AIAA
Publisher:American Institute of Aeronautics and Astronautics (AIAA)
ISSN:0022-4650
ISBN:ISBN: 978-162410524-1
Status:Published
Keywords:porous coatings, HEG, UAT, hypersonic Transition, Transition delay, cone, Inverse Helmholtz Solver
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 - Wiederverwendbare Raumfahrtsysteme
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Spacecraft, GO
Deposited By: Wagner, Alexander
Deposited On:05 Jan 2019 14:02
Last Modified:05 Jan 2019 14:02

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