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Tomographic shadowgraphy for spray diagnostics

Klinner, Joachim and Willert, Christian (2011) Tomographic shadowgraphy for spray diagnostics. ILASS – Europe 2011, 24th European Conference on Liquid Atomization and Spray Systems, 5.-7.September 2011, Estoril, Portugal.

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Official URL: http://www.ilass2011.org/


This contribution introduces 3-D shadowgraphy which is capable of resolving the placement of the liquid phase within a certain spray volume both spatially and temporally. The method is based on a multiple view camera setup and inline illumination provided by current pulsed LEDs. The quality of spray reconstruction was investigated using experimental data from multiple view shadowgraphs of hollow cone and flat fan water sprays. After calibration and determination of a 3-D mapping function for each view a line-of-sight (LOS) intensity reconstruction was implemented. After sequential combination of back-projected images at each voxel plane of the volume the 3-D droplet and ligament positions can be readily obtained. Further improvement of intensity reconstruction may be achieved by a iterative tomographic reconstruction, namely multiplicative algebraic reconstruction technique (SMART). These improvements are documented by comparing slices of the averaged 3-D shadowgraph intensity of the hollow cone spray orthogonal to the flow. The investigations were further substantiated with simulations using synthetic data to estimate reconstruction quality at increasing droplet densities.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Tomographic shadowgraphy for spray diagnostics
AuthorsInstitution or Email of Authors
Klinner, Joachimjoachim.klinner@dlr.de
Willert, Christianchris.willert@dlr.de
Date:5 September 2011
Refereed publication:Yes
In ISI Web of Science:No
Keywords:tomographic reconstruction, pulsed LED, shadowgraphy, multiple views, spray diagnostics, airblast atomization, 3-D particle tracking velocimetry, PTV
Event Title:ILASS – Europe 2011, 24th European Conference on Liquid Atomization and Spray Systems
Event Location:Estoril, Portugal
Event Type:international Conference
Event Dates:5.-7.September 2011
Organizer:ILASS Europe Committee
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 11:05
Last Modified:12 Dec 2013 21:32

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