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Tomographic Spray Shadowgraphy - A Feasibility Study

Klinner, Joachim and 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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Official URL: http://fvr2011.conference.univ-poitiers.fr/

Abstract

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.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Tomographic Spray Shadowgraphy - A Feasibility Study
Authors:
AuthorsInstitution or Email of Authors
Klinner, Joachimjoachim.klinner@dlr.de
Willert, Christianchris.willert@dlr.de
Date:30 November 2011
Refereed publication:Yes
In ISI Web of Science:No
Status:Published
Keywords:tomographic reconstruction, pulsed LED, shadowgraphy, multiple views, spray diagnostics, airblast atomization, 3-D particle tracking velocimetry, PTV
Event Title:Forum on recent developments in Volume Reconstruction techniques applied to 3D fluid and solid mechanics 2011
Event Location:Poitiers, Frankreich
Event Type:international Conference
Event Dates:29.11.-01.12.2011
Organizer:University of Poitiers
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion (old)
HGF - Program Themes:E VG - Combustion and Gas Turbine Technologies (old)
DLR - Research area:Energy
DLR - Program:E VG - Combustion and Gas Turbine Technologies
DLR - Research theme (Project):E - Gasturbine (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Engine Measurement Systems
Deposited By: Joachim Klinner
Deposited On:19 Jan 2012 11:04
Last Modified:12 Dec 2013 21:32

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