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Combined Experimental and Numerical Investigation of a Hypersonic Turbulent Boundary Layer by Means of FLDI and Large-Eddy Simulations

Ponchio Camillo, Giannino and Wagner, Alexander and Toki, Takahiko and Scalo, Carlo (2023) Combined Experimental and Numerical Investigation of a Hypersonic Turbulent Boundary Layer by Means of FLDI and Large-Eddy Simulations. Aerospace, 10 (570), pp. 1-31. Multidisciplinary Digital Publishing Institute (MDPI). doi: 10.3390/aerospace10060570. ISSN 2226-4310.

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Official URL: https://www.mdpi.com/2226-4310/10/6/570

Abstract

This work investigates a hypersonic turbulent boundary layer over a straight cone with cold walls at M = 7.4 and Rem = 4.2 · 10^6 m^−1, in terms of density fluctuations away from the wall and convection velocity of density disturbances. Experimental data is collected in a shock tunnel using a multi-foci Focused Laser Differential Interferometer (FLDI) to probe the boundary layer at several different heights from the cone wall. In addition, a high-fidelity, time-resolved Large-Eddy Simulation (LES) of the conical flowfield under the experimentally observed free stream conditions is calculated. The experimentally measured convection velocity of density disturbances is verified to follow literature data of pressure disturbances. The spectral distributions evidence the presence of regions with well-defined power laws. As an alternative to complex methodologies to compensate the frequency roll-off caused by the FLDI spatial filtering, a computational FLDI (cFLDI) is calculated on the numerical solution for direct comparison with experiments. Frequency bounds of 160 kHz < f < 1 MHz are evaluated in consideration for constraining conditions of both experimental and numerical data. Within these limits, the direct comparisons yield reasonable agreement. It is also verified that in the present case the cFLDI algorithm may be replaced with a simple line integral on the numerical solution.

Item URL in elib:https://elib.dlr.de/194463/
Document Type:Article
Title:Combined Experimental and Numerical Investigation of a Hypersonic Turbulent Boundary Layer by Means of FLDI and Large-Eddy Simulations
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Ponchio Camillo, GianninoUNSPECIFIEDhttps://orcid.org/0000-0002-2178-0777UNSPECIFIED
Wagner, AlexanderUNSPECIFIEDhttps://orcid.org/0000-0002-9700-1522UNSPECIFIED
Toki, TakahikoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Scalo, CarloUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Date:20 June 2023
Journal or Publication Title:Aerospace
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:10
DOI:10.3390/aerospace10060570
Page Range:pp. 1-31
Editors:
EditorsEmailEditor's ORCID iDORCID Put Code
UNSPECIFIEDMDPIUNSPECIFIEDUNSPECIFIED
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
ISSN:2226-4310
Status:Published
Keywords:HEG, FLDI, hypersonic turbulence, cone, hypersonic
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 - Reusable Space Systems and Propulsion Technology
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Spacecraft, GO
Deposited By: Wagner, Alexander
Deposited On:16 Nov 2023 10:07
Last Modified:03 May 2024 15:52

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