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Pulsed, high-power LED illumination for tomographic particle image velocimetry

Buchmann, Nicolas A. und Willert, Christian und Soria, Julio (2012) Pulsed, high-power LED illumination for tomographic particle image velocimetry. Experiments in Fluids, 53 (5), Seiten 1545-1560. Springer Verlag. DOI: 10.1007/s00348-012-1374-5. ISSN 0723-4864.

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Offizielle URL: http://link.springer.com/article/10.1007/s00348-012-1374-5

Kurzfassung

This paper investigate the use of high-power light emitting diode (LED) illumination for Tomographic Particle Image Velocimetry (PIV) as an alternative to traditional laser-based illumination. Modern solid-state LED devices can provide averaged radiant power in excess of 10W and by operating the LED with short high current pulses theoretical pulse energies up to several tens of mJ can be achieved. In the present work, a custom build drive circuit is used to drive a Luminus PT-120 high power LED at pulsed currents of up to 150A and 1ms duration. Volumetric illumination is achieved by directly projecting the LED into the flow to produce a measurement volume of ~3-4 times the size of the LED die. The feasibility of the volumetric LED illumination is assessed by performing tomographic PIV of homogenous, grid-generated turbulence. Two types of LEDs are investigated and the results are compared with measurements of the same flow using pulsed Nd:YAG laser illumination and DNS data of homogeneous isotropic turbulence. The quality of the results is similar for both investigated LEDs with no significant difference between the LED and Nd:YAG illumination. Compared with the DNS some differences are observed in the power spectra and the probability distributions of the fluctuating velocity and velocity gradients. These differences are attributed to the limited spatial resolution of the experiments and noise introduced during the tomographic reconstruction (i.e. ghost particles). The uncertainty in the velocity measurements associated with the LED illumination is estimated to approximately 0.2-0.3 pixel for both LEDs, which compares favourably with similar tomographic PIV measurements of turbulent flows. In conclusion, the proposed high-power, pulsed LED volume illumination provides accurate and reliable tomographic PIV measurements in water and presents a promising technique for flow diagnostics and velocimetry.

Dokumentart:Zeitschriftenbeitrag
Titel:Pulsed, high-power LED illumination for tomographic particle image velocimetry
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Buchmann, Nicolas A.Monash University
Willert, Christianchris.willert@dlr.de
Soria, JulioMonash University
Datum:September 2012
Erschienen in:Experiments in Fluids
Referierte Publikation:Ja
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:53
DOI :10.1007/s00348-012-1374-5
Seitenbereich:Seiten 1545-1560
Verlag:Springer Verlag
ISSN:0723-4864
Status:veröffentlicht
Stichwörter:tomographic PIV, grid turbulence, pulsed light source, light emitting diode, flow field measurement
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Antriebe
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L ER - Antriebsforschung
DLR - Teilgebiet (Projekt, Vorhaben):L - Virtuelles Triebwerk und Validierungsmethoden
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Antriebstechnik > Triebwerksmesstechnik
Hinterlegt von: Dr.phil. Christian Willert
Hinterlegt am:16 Nov 2012 11:42
Letzte Änderung:07 Feb 2013 20:12

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