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Density measurements using near-field background-oriented Schlieren

Van Hinsberg, Nils Paul and Rösgen, Thomas (2014) Density measurements using near-field background-oriented Schlieren. Experiments in Fluids, 55 (4). Springer. doi: 10.1007/s00348-014-1720-x. ISSN 0723-4864.

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Official URL: http://dx.doi.org/10.1007/s00348-014-1720-x


A modification of the constant correction factor in the known equations of the background-oriented Schlieren is presented in order to be applicable to the nearfield. Near-Field background-oriented Schlieren has the Advantage over standard background-oriented Schlieren of being able to obtain reliable density distributions for Setups in which the background pattern is placed directly behind the investigated flow field. It is proven that the modified correction factor depends solely on the distance between the background pattern and the flow field and on the external shape of the investigated flow field itself. The proof of principle and the accuracy of the proposed technique are obtained by the simulation of a 2D density Variation with the use of glass wedge prism. The measurement of the whole-field density information of a supersonic underexpanded free jet is presented as an example that confirms the theoretical predictions.

Item URL in elib:https://elib.dlr.de/88908/
Document Type:Article
Title:Density measurements using near-field background-oriented Schlieren
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Van Hinsberg, Nils Paulnils.vanhinsberg (at) dlr.deUNSPECIFIED
Rösgen, ThomasInstitute of Fluid Dynamics, ETH ZurichUNSPECIFIED
Date:April 2014
Journal or Publication Title:Experiments in Fluids
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1007/s00348-014-1720-x
Keywords:Background oriented Schlieren, modified correction factor, near-field, compressible flow
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:ATM and Operation (old)
DLR - Research area:Aeronautics
DLR - Program:L AO - Air Traffic Management and Operation
DLR - Research theme (Project):L - Air Transport Concepts and Operation (old)
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Aeroelastic Experiments
Deposited By: van Hinsberg, Dr. Ir. Nils
Deposited On:07 Aug 2014 13:27
Last Modified:06 Sep 2019 15:25

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