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Linear stability analysis of second-mode attenuation via porous carbon-matrix ceramics

Sousa, Victor C. B. and Wartemann, Viola and Wagner, Alexander and Scalo, Carlo (2023) Linear stability analysis of second-mode attenuation via porous carbon-matrix ceramics. Physics of Fluids. American Institute of Physics (AIP). doi: 10.1063/5.0152894. ISSN 1070-6631.

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Abstract

Effects of porous carbon-fiber-reinforced carbon-matrix ceramics (C/C) on the stability of second-mode waves on a 7°-half-angle cone were investigated for Reynolds numbers Re = 2.43 - 6.40 x 10^6 1/m at the freestream Mach number of Ma 7.4, for both sharp and 2.5 mm-round nose tips. A broadband time-domain impedance boundary condition was used to model the effects of the C/C porosity on the flow dynamics leveraging direct ultrasonic benchtop experiments and homogenous absorber theory. A spectral linear stability solver based on orthogonal Laguerre functions, naturally vanishing in the free stream, was used to predict linear spatial growth rates, which are in agreement with independent pulsed axisymmetric direct-numerical simulations. The latter were carried out with the quasi-spectral viscosity closure -a dynamic quasi-spectral procedure capable of deactivating the subfilter scale stresses in the absence of turbulent break down - verifying its suitability to carry out transitional calculations without affecting ultrasonic wave dynamics. The effectiveness of a porous C/C surface is shown to decrease drastically with static pressure and its presence is shown to decrease the second-mode growth rates in regions where it is unstable as well as increasing the attenuation rates in regions where it is stable

Item URL in elib:https://elib.dlr.de/195569/
Document Type:Article
Title:Linear stability analysis of second-mode attenuation via porous carbon-matrix ceramics
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Sousa, Victor C. B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wartemann, ViolaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wagner, AlexanderUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Scalo, CarloUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Date:14 June 2023
Journal or Publication Title:Physics of Fluids
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI:10.1063/5.0152894
Publisher:American Institute of Physics (AIP)
ISSN:1070-6631
Status:Published
Keywords:Linear stability analysis, LST, Second Mode damping, cone, porous carbon matrix ceramics
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 , Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Spacecraft, BS
Institute for Aerodynamics and Flow Technology > Spacecraft, GO
Deposited By: Wartemann, Viola
Deposited On:25 Oct 2023 10:06
Last Modified:28 Nov 2023 13:14

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