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Practical aspects of designing background-oriented schieren (BOS) experiments for vortex measurements

Schwarz, Clemens and Braukmann, Johannes N. (2022) Practical aspects of designing background-oriented schieren (BOS) experiments for vortex measurements. In: Vertical Flight Society's 78th Annual Forum & Technology Display, pp. 1-18. Vertical Flight Society's 78th Annual Forum & Technology Display, 2022-05-10 - 2022-05-12, Fort Worth, TX, USA. ISSN 2167-1281.

Full text not available from this repository.

Official URL: https://vtol.org/forum

Abstract

Density-based schlieren methods are a well-known and well-established tool for studying flows. A representative of this category that has become increasingly important in recent years is the background-oriented schlieren method (BOS). Like other schlieren techniques, the BOS method is based on a changing refraction of light rays due to spatial density gradients in the flow field. Schlieren objects are imaged, usually with a digital camera, in front of a structured background pattern, which results in displacements (ud, vd) of the pattern in the image plane. The camera is focused on the background, meaning that the schlieren object itself is recorded with geometric blur. The background shift is evaluated by a moving-window cross-correlation between the measurement image and an undisturbed reference image with no density gradient between camera and background.

Item URL in elib:https://elib.dlr.de/186317/
Document Type:Conference or Workshop Item (Speech)
Additional Information:Vortrag mit Paper
Title:Practical aspects of designing background-oriented schieren (BOS) experiments for vortex measurements
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Schwarz, ClemensUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Braukmann, Johannes N.UNSPECIFIEDhttps://orcid.org/0000-0001-8046-9623UNSPECIFIED
Date:May 2022
Journal or Publication Title:Vertical Flight Society's 78th Annual Forum & Technology Display
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-18
ISSN:2167-1281
Status:Published
Keywords:BOS, blade tip vortices, sensitivity, signal prediction, blurr
Event Title:Vertical Flight Society's 78th Annual Forum & Technology Display
Event Location:Fort Worth, TX, USA
Event Type:international Conference
Event Start Date:10 May 2022
Event End Date:12 May 2022
Organizer:Vertical Flight Society
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Efficient Vehicle
DLR - Research area:Aeronautics
DLR - Program:L EV - Efficient Vehicle
DLR - Research theme (Project):L - Virtual Rotorcraft and Validation
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Helicopter, GO
Deposited By: Carter, Beatrice
Deposited On:09 Jun 2022 16:59
Last Modified:24 Apr 2024 20:47

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