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High speed shadowgraphy of a combusting atomizer spray at elevated pressure

Willert, Christian and Klinner, Joachim and Moessner, Steffen and Freitag, Stefan and Hassa, Christoph (2010) High speed shadowgraphy of a combusting atomizer spray at elevated pressure. Diagnostik i.d. Verbrennung (DIV6), 27-28 Oct 2010, Göttingen, Germany.

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Abstract

This contribution demonstrates the use of a compact high repetition rate pulsed high power LED light source in combination with a high speed camera to obtain high speed shadowgraphs of an airblasted spray in a fired research combustor at medium pressures. The temporally resolved structures are subjected to conventional spectral analysis and exhibit very dominant fundamental frequencies throughout the visualized spray structures. The image data is further compared to time series of drop-sizing measurements made by a phase Doppler instrument. The periodicity is attributed to a spiraling spray release from the nozzle lip that is believed to be induced by a precessing vortex or vortices orbiting around the burner axis. The logical extension of the technique is to use multiple views to obtain different views of the spray simultaneously. Photogrammetric or tomographic reconstruction techniques then allow the spray to be reconstructed three-dimensionally. The technique is demonstrated on a water spray nozzle.

Document Type:Conference or Workshop Item (Speech)
Title:High speed shadowgraphy of a combusting atomizer spray at elevated pressure
Authors:
AuthorsInstitution or Email of Authors
Willert, Christianchris.willert@dlr.de
Klinner, Joachimjoachim.klinner@dlr.de
Moessner, SteffenUNSPECIFIED
Freitag, StefanDLR AT
Hassa, ChristophDLR AT
Date:27 October 2010
Status:Published
Keywords:light emitting diode, pulsed illumination, fuel spray, shadowgraphy, combustion, high speed imaging, flow diagnostics, swirl burner, tomographic spray reconstruction
Event Title:Diagnostik i.d. Verbrennung (DIV6)
Event Location:Göttingen, Germany
Event Type:Workshop
Event Dates:27-28 Oct 2010
Organizer:DLR Institute of Propulsion Technology, Turbine
HGF - Research field:Aeronautics, Space and Transport (old)
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 > Engine Measurement Systems
Institute of Propulsion Technology > Combustor
Deposited By: Dr.phil. Christian Willert
Deposited On:18 Apr 2011 08:54
Last Modified:18 Apr 2011 08:54

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