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High speed imaging of fuel sprays using a low-cost illumination source

Willert, Christian and Freitag, Stefan and Hassa, Christoph (2008) High speed imaging of fuel sprays using a low-cost illumination source. 22nd European Conference on Liquid Atomization and Spray Systems (ILASS 2008), 2008-09-08 - 2008-09-10, Como Lake (Italy).

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Abstract

The recent availability of (affordable) high frame rate electronic imaging with large frame counts now allows for parametric, time-resolved investigations of the liquid break-up processes that dominate the atomization. In previous investigations high-speed background shadowgraphy was used to observe the liquid sheet breakup process downstream of prefilming airblast atomizers. Here the choice of illumination was one of the challenges and ultimately employed a high-power continuous light source. A careful trade-off between sufficient camera exposure time and tolerable motion blur yielded images of adequate contrast to successfully complete the investigation. As an alternative to high power continuous light sources the article explores the use pulsed light illumination for imaging applications of this type. In particular recent efforts utilizing pulsed light-emitting diodes (LEDs) are described. Images acquired in an in-line illumination arrangement exhibit high contrast and practical absence of frame-to-frame intensity fluctuations, and thus are well suited for statistical and time-spectral image processing.

Document Type:Conference or Workshop Item (Poster)
Title:High speed imaging of fuel sprays using a low-cost illumination source
Authors:
AuthorsInstitution or Email of Authors
Willert, ChristianUNSPECIFIED
Freitag, StefanUNSPECIFIED
Hassa, ChristophUNSPECIFIED
Date:8 September 2008
Refereed publication:No
In ISI Web of Science:No
Status:Published
Keywords:shadowgraph, light emitting diode, pulsed LED, particle tracking, particle image velocimetry, PIV, spray formation, visualization techniques, high frame rate imaging
Event Title:22nd European Conference on Liquid Atomization and Spray Systems (ILASS 2008)
Event Location:Como Lake (Italy)
Event Type:international Conference
Event Dates:2008-09-08 - 2008-09-10
Organizer:Institute for Liquid Atomization and Spray Systems
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Propulsion Systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Virtual Engine and Validation Methods
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology
Institute of Propulsion Technology > Engine Measurement Systems
Institute of Propulsion Technology > Combustor
Deposited By: Dr.phil. Christian Willert
Deposited On:08 Sep 2008
Last Modified:12 Dec 2013 20:32

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