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A modification of the classical correction factor for digital background oriented Schlieren when applied in the near-field

Van Hinsberg, Nils Paul (2014) A modification of the classical correction factor for digital background oriented Schlieren when applied in the near-field. In: 17th International Symposium on Applications of Laser Techniques to Fluid Mechanics, 2.11.1-2.11.1. 17th International Symposium on Applications of Laser techniques to Fluid Mechanics, 07.-10. Juli 2014, Lisbon, Portugal.

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Abstract

For the conversion of the measured apparent background shift into the density gradients of the flow a constant correction factor is generally used in the applied equations for digital background oriented Schlieren. In case the distance between the Schlieren object and the BOS background pattern is of the same order as the width of the Schlieren object (the near-field), these equations fail to provide reliable density fields. In this paper a modification of the constant correction factor is presented for BOS in order to be applicable in this near-field. It is shown that the variable factor depends solely on two parameters that are fixed by the setup and by the shape of the investigated flow field. The achieved accuracy of the modified BOS equations is shown by the simulation of a known two-dimensional density field using a glass wedge prism. A comparison of the measured characteristic parameters of the diamond pattern of a supersonic jet with the theoretical values shows the applicability of this technique to fluid dynamic related studies.

Document Type:Conference or Workshop Item (Speech)
Title:A modification of the classical correction factor for digital background oriented Schlieren when applied in the near-field
Authors:
AuthorsInstitution or Email of Authors
Van Hinsberg, Nils Paulnils.vanhinsberg@dlr.de
Date:July 2014
Journal or Publication Title:17th International Symposium on Applications of Laser Techniques to Fluid Mechanics
Refereed publication:No
In ISI Web of Science:No
Page Range:2.11.1-2.11.1
Status:Published
Keywords:correction factor, BOS, near-field, jet flow
Event Title:17th International Symposium on Applications of Laser techniques to Fluid Mechanics
Event Location:Lisbon, Portugal
Event Type:international Conference
Event Dates:07.-10. Juli 2014
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flexible Aircraft
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Aeroelastic Experiments
Deposited By: Dr. Ir. Nils van Hinsberg
Deposited On:07 Aug 2014 13:36
Last Modified:07 Aug 2014 13:36

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