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Combined free-stream disturbance measurements and receptivity studies in hypersonic wind tunnels by means of a slender wedge probe and direct numerical simulation

Wagner, Alexander and Schülein, Erich and Petervari, René and Hannemann, Klaus and Syed Raza, Christopher Ali and Cerminara, Adriano and Sandham, N.D. (2018) Combined free-stream disturbance measurements and receptivity studies in hypersonic wind tunnels by means of a slender wedge probe and direct numerical simulation. Journal of Fluid Mechanics, 842, pp. 495-531. Cambidge University Press. DOI: https://doi.org/10.1017/jfm.2018.132 ISSN 0022-1120

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Abstract

Combined free-stream disturbance measurements and receptivity studies in hypersonic wind tunnels were conducted by means of a slender wedge probe and direct numerical simulation. The study comprises comparative tunnel noise measurements at Mach 3, 6 and 7.4 in two Ludwieg tube facilities and a shock tunnel. Surface pressure fluctuations were measured over a wide range of frequencies and test conditions including harsh test environments not accessible to measurement techniques such as Pitot probes and hot-wire anemometry. A good agreement was found between normalized Pitot pressure fluctuations converted into normalized static pressure fluctuations and the wedge probe readings. Quantitative results of the tunnel noise are provided in frequency ranges relevant for hypersonic boundary-layer transition. Complementary numerical simulations of the leading-edge receptivity to fast and slow acoustic waves were performed for the applied wedge probe at conditions corresponding to the experimental free-stream conditions. The receptivity to fast acoustic waves was found to be characterized by an early amplification of the induced fast mode. For slow acoustic waves an initial decay was found close to the leading edge. At all Mach numbers, and for all considered frequencies, the leading-edge receptivity to fast acoustic waves was found to be higher than the receptivity to slow acoustic waves. Further, the effect of inclination angles of the acoustic wave with respect to the flow direction was investigated. An inclination angle was found to increase the response on the wave-facing surface of the probe and decrease the response on the opposite surface for fast acoustic waves. A frequency-dependent response was found for slow acoustic waves. The combined numerical and experimental approach in the present study confirmed the previous suggestion that the slow acoustic wave is the dominant acoustic mode in noisy hypersonic wind tunnels.

Item URL in elib:https://elib.dlr.de/119362/
Document Type:Article
Additional Information:Open Access Publication; Published online: 13 March 2018; https://www.cambridge.org/core/journals/journal-of-fluid-mechanics/article/combined-freestream-disturbance-measurements-and-receptivity-studies-in-hypersonic-wind-tunnels-by-means-of-a-slender-wedge-probe-and-direct-numerical-simulation/9481E9D34164EA3D680A81208548D62D
Title:Combined free-stream disturbance measurements and receptivity studies in hypersonic wind tunnels by means of a slender wedge probe and direct numerical simulation
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Wagner, AlexanderAlexander.Wagner (at) dlr.dehttps://orcid.org/0000-0002-9700-1522
Schülein, ErichErich.Schuelein (at) dlr.dehttps://orcid.org/0000-0002-1125-8504
Petervari, Renérene.petervari (at) fhr.fraunhofer.deUNSPECIFIED
Hannemann, Klausklaus.hannemann (at) dlr.deUNSPECIFIED
Syed Raza, Christopher AliTU BraunschweigUNSPECIFIED
Cerminara, AdrianoA.Cerminara (at) soton.ac.ukUNSPECIFIED
Sandham, N.D.n.sandham (at) soton.ac.ukUNSPECIFIED
Date:13 March 2018
Journal or Publication Title:Journal of Fluid Mechanics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:842
DOI :https://doi.org/10.1017/jfm.2018.132
Page Range:pp. 495-531
Publisher:Cambidge University Press
ISSN:0022-1120
Status:Published
Keywords:boundary layer receptivity, compressible boundary layers, Transition to turbulence, HEG, free-stream-disturbances
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
Institute for Aerodynamics and Flow Technology > High Speed Configurations, GO
Deposited By: Wagner, Alexander
Deposited On:08 May 2018 10:03
Last Modified:23 Feb 2019 00:22

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