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Tomographic Spray Shadowgraphy - A Feasibility Study

Klinner, Joachim und Willert, Christian (2011) Tomographic Spray Shadowgraphy - A Feasibility Study. Forum on recent developments in Volume Reconstruction techniques applied to 3D fluid and solid mechanics 2011, 29.11.-01.12.2011, Poitiers, Frankreich.

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Offizielle URL: http://fvr2011.conference.univ-poitiers.fr/

Kurzfassung

This contribution introduces tomographic shadowgraphy, a volume resolving imaging technique which is capable of recovering the liquid phase of a spray both spatially and temporally. The method is based on a multiple view camera setup with inline illumination provided by current pulsed LEDs which results in droplet shadows being projected onto the sensor plane. Each camera records image pairs with short interframing times which allows the trajectories of the individual droplets to be estimated using conventional three-dimensional particle tracking approaches. The observed volume is calibrated with a traversed micro target. A comparison is made between several photogrammetric and polynomial least square camera calibration techniques regarding their accuracy in deep volume calibration at magnifications close to unity. A calibration method based on volume calibration from multiple planar homographies at equally spaced z-planes was found to produce the most reliable calibration. Sequential combination of back-projected images at each voxel plane efficiently reproduces the droplet positions in three-dimensional space. The quality of spray reconstruction is investigated using experimental data from multiple view shadowgraphs of a hollow cone spray.

Dokumentart:Konferenzbeitrag (Vortrag, Paper)
Titel:Tomographic Spray Shadowgraphy - A Feasibility Study
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Klinner, Joachimjoachim.klinner@dlr.de
Willert, Christianchris.willert@dlr.de
Datum:30 November 2011
Referierte Publikation:Ja
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:tomographic reconstruction, pulsed LED, shadowgraphy, multiple views, spray diagnostics, airblast atomization, 3-D particle tracking velocimetry, PTV
Veranstaltungstitel:Forum on recent developments in Volume Reconstruction techniques applied to 3D fluid and solid mechanics 2011
Veranstaltungsort:Poitiers, Frankreich
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:29.11.-01.12.2011
Veranstalter :University of Poitiers
HGF - Forschungsbereich:Energie
HGF - Programm:Rationelle Energieumwandlung (alt)
HGF - Programmthema:E VG - Verbrennungs- und Gasturbinentechnik (alt)
DLR - Schwerpunkt:Energie
DLR - Forschungsgebiet:E VG - Verbrennungs- und Gasturbinentechnik
DLR - Teilgebiet (Projekt, Vorhaben):E - Gasturbine (alt)
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Antriebstechnik > Triebwerksmesstechnik
Hinterlegt von: Joachim Klinner
Hinterlegt am:19 Jan 2012 11:04
Letzte Änderung:12 Dez 2013 21:32

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