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Tomographic shadowgraphy of swirled non-reactive spray injection in a generic aero engine burner under realistic operating conditions

Klinner, Joachim and Freitag, Stefan and Hassa, Christoph and Willert, Christian (2016) Tomographic shadowgraphy of swirled non-reactive spray injection in a generic aero engine burner under realistic operating conditions. In: 27th Annual Conference on Liquid Atomization and Spray Systems. 27th Annual Conference on Liquid Atomization and Spray Systems, 4.-7. September 2016, Brighton UK. ISBN 978-1-910172-10-0

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Official URL: http://www.ilass2016.org/

Abstract

This contribution describes the application of tomographic shadowgraphy to measure instantaneous velocities of droplets undergoing airblast-atomization in the non-reactive flow of a generic aero engine burner model at Weber numbers of We_aero=360-770, air pressures of pa=4-7bar and air temperatures of Ta=440-570K. The burner employs air-blast atomization of a single jet in cross-flow in the main stage. The measurement setup is described in detail and the depth-of-field with respect to droplet size is estimated. The latter was calculated on the basis of Mie simulations and calibration data of the point-spread function. At a given volume size of 16x13x10mm3 it turned out that the minimum resolvable droplet diameter reduces down to d = 10 µm within the focus and increases up to d = 10 -20 µm towards the volume edges. Velocities of droplets above the resolution limit were retrieved by 3D correlation of two volumetric reconstructions recorded at consecutive time-steps. Extracted slices of the instantaneous axial velocity indicate strong motion and fluctuations of the spray tail with increasing temperature and Weber number. Validation against PDA data revealed good agreement at size classes d = 10 µm; 15 µm. Slight deviations occur in regions with strong velocity gradients probably due to the presence of reconstruction ambiguities (ghost particles).

Item URL in elib:https://elib.dlr.de/109916/
Document Type:Conference or Workshop Item (Speech)
Title:Tomographic shadowgraphy of swirled non-reactive spray injection in a generic aero engine burner under realistic operating conditions
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Klinner, JoachimJoachim.Klinner (at) dlr.deUNSPECIFIED
Freitag, StefanStefan.Freitag (at) dlr.deUNSPECIFIED
Hassa, ChristophChristoph.Hassa (at) dlr.deUNSPECIFIED
Willert, ChristianChris.Willert (at) dlr.dehttps://orcid.org/0000-0002-1668-0181
Date:4 September 2016
Journal or Publication Title:27th Annual Conference on Liquid Atomization and Spray Systems
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
ISBN:978-1-910172-10-0
Status:Published
Keywords:spray analysis, tomographic imaging, pulsed LED illumination, airblast atomization
Event Title:27th Annual Conference on Liquid Atomization and Spray Systems
Event Location:Brighton UK
Event Type:international Conference
Event Dates:4.-7. September 2016
Organizer:Universtity of Brighton
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 > Engine Measurement Systems
Deposited By: Klinner, Joachim
Deposited On:04 Jan 2017 11:46
Last Modified:04 Jan 2017 11:46

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