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Background‑oriented schlieren imaging of flow around a circular cylinder at low Mach numbers

Stadler, Hannes and Bauknecht, Andre and Siegrist, Silvan and Flesch, Robert and Wolf, Christian C. and van Hinsberg, Nils and Jacobs, Markus (2017) Background‑oriented schlieren imaging of flow around a circular cylinder at low Mach numbers. Experiments in Fluids, 58 (114), pp. 1-12. Springer Nature. doi: 10.1007/s00348-017-2398-7. ISSN 0723-4864.

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Official URL: https://doi.org/10.1007/s00348-017-2398-7


The background-oriented schlieren (BOS) imaging method has, for the first time, been applied in the investigation of the flow around a circular cylinder at low Mach numbers (M < 0.1). The measurements were conducted in the high pressure wind tunnel, Göttingen, with static pressures ranging from 0.1 MPa to 6.0 MPa and covered a range of the Reynolds numbers of 0.1 × 106 ≤ Re ≤ 6.0 × 106. Even at ambient pressure and the lowest Reynolds number investigated, density gradients associated with the flow around the cylinder were recorded. The signal-to-noise ratio of the evaluated gradient field improved with increasing stagnation pressure. The Separation point could easily be identified with this non-intrusive measurement technique and corresponds well to simultaneous surface pressure measurements. The resulting displacement field is in principle of qualitative nature as the observation angle was parallel to the cylinder axis only in a single point of the recorded images. However, it has been possible to integrate the density field along the surface of the cylinder by successive imaging at incremental angular positions around the cylinder. This density distribution has been found to agree well with the pressure measurements and with potential theory where appropriate.

Item URL in elib:https://elib.dlr.de/113959/
Document Type:Article
Title:Background‑oriented schlieren imaging of flow around a circular cylinder at low Mach numbers
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Bauknecht, AndreUNSPECIFIEDhttps://orcid.org/0000-0002-4076-780XUNSPECIFIED
Siegrist, SilvanUNSPECIFIEDhttps://orcid.org/0000-0001-9069-2220UNSPECIFIED
Flesch, RobertUNSPECIFIEDhttps://orcid.org/0000-0003-2725-8039UNSPECIFIED
Wolf, Christian C.UNSPECIFIEDhttps://orcid.org/0000-0002-9052-7548UNSPECIFIED
van Hinsberg, NilsUNSPECIFIEDhttps://orcid.org/0000-0001-7411-333X134152073
Date:17 August 2017
Journal or Publication Title:Experiments in Fluids
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 1-12
EditorsEmailEditor's ORCID iDORCID Put Code
Publisher:Springer Nature
Keywords:BOS, Windkanal, Zylinder
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Concentrating Solar Thermal Technology
DLR - Research area:Energy
DLR - Program:E SW - Solar and Wind Energy
DLR - Research theme (Project):E - Advanced Heat Transfer Media (old)
Location: Jülich
Institutes and Institutions:Institute of Solar Research > Punktfokussierende Systeme
Institute for Aerodynamics and Flow Technology > Helicopter, GO
Institute of Aeroelasticity > Aeroelastic Experiments
German-Dutch Windtunnels
Deposited By: Uhlig, Tamara
Deposited On:19 Sep 2017 14:59
Last Modified:02 Nov 2023 13:30

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