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Large-scale tomographic particle image velocimetry using helium-filled soap bubbles

Kühn, Matthias und Ehrenfried, Klaus und Bosbach, Johannes und Wagner, Claus (2011) Large-scale tomographic particle image velocimetry using helium-filled soap bubbles. Experiments in Fluids, Vol. 50 (4), Seiten 929-948. Springer Verlag, Berlin Heidelberg. DOI: 10.1007/s00348-010-0947-4.

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Offizielle URL: http://www.springerlink.com/content/02496m236217vpjk/fulltext.pdf

Kurzfassung

To measure large-scale flow structures in air, a tomographic particle image velocimetry (tomographic PIV) system for measurement volumes of the order of one cubic metre is developed, which employs helium-filled soap bubbles (HFSBs) as tracer particles. The technique has several specific characteristics compared to most conventional tomographic PIV systems, which are usually applied to small measurement volumes. One of them is spot lights on the HFSB tracers, which slightly change their position, when the direction of observation is altered. Further issues are the large particle to voxel ratio and the short focal length of the used camera lenses, which result in a noticeable variation of the magnification factor in volume depth direction. Taking the specific characteristics of the HFSBs into account, the feasibility of our large-scale tomographic PIV system is demonstrated by showing that the calibration errors can be reduced down to 0.1 pixels as required. Further, an accurate and fast implementation of the multiplicative algebraic reconstruction technique, which calculates the weighting coefficients when needed instead of storing them, is discussed. The tomographic PIV system is applied to measure forced convection in a convection cell at a Reynolds number of 530 based on the inlet channel height and the mean inlet velocity. The size of the measurement volume and the interrogation volumes amount to 750 mm × 450 mm × 165 mm and 48 mm × 48 mm × 24 mm, respectively. Validation of the tomographic PIV technique employing HFSBs is further provided by comparing profiles of the mean velocity and of the root mean square velocity fluctuations to respective planar PIV data.

Dokumentart:Zeitschriftenbeitrag
Zusätzliche Informationen:Published online: 14 August 2010
Titel:Large-scale tomographic particle image velocimetry using helium-filled soap bubbles
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Kühn, Matthiasmatthias.kuehn@dlr.de
Ehrenfried, Klausklaus.ehrenfried@dlr.de
Bosbach, Johannesjohannes.bosbach@dlr.de
Wagner, Clausclaus.wagner@dlr.de
Datum:2011
Erschienen in:Experiments in Fluids
Referierte Publikation:Ja
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:Vol. 50
DOI :10.1007/s00348-010-0947-4
Seitenbereich:Seiten 929-948
Verlag:Springer Verlag, Berlin Heidelberg
Status:veröffentlicht
Stichwörter:Tomographic PIV, Large-scale PIV, Helium filled soap bubble, Calibration errors, MART implementation, LED light source, Validation, Confined forced convection
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Starrflügler
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L AR - Starrflüglerforschung
DLR - Teilgebiet (Projekt, Vorhaben):L - Flugphysik
Standort: Göttingen
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > Fluidsysteme
Hinterlegt von: Matthias Kühn
Hinterlegt am:22 Sep 2010 08:48
Letzte Änderung:04 Apr 2013 16:18

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