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Characterization of Lean Burn Module Air Blast Pilot Injector With Laser Techniques

Meier, Ulrich and Freitag, Stefan and Heinze, Johannes and Lange, Lena and Magens, Eggert and Schroll, Michael and Willert, Christian and Hassa, Christoph and Bagchi, Imon-Kalyan and Lazik, Waldemar and Whiteman, Michael (2013) Characterization of Lean Burn Module Air Blast Pilot Injector With Laser Techniques. Journal of Engineering for Gas Turbines and Power, 135 (12), pp. 121508-1. American Society of Mechanical Engineers (ASME). DOI: 10.1115/1.4025148 ISSN 0742-4795

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Official URL: http://gasturbinespower.asmedigitalcollection.asme.org/

Abstract

For lean burn combustor development in low emission aero-engines, the pilot stage of the fuel injector plays a key role with respect to stability, operability, NOx emissions, and smoke production. Therefore it is of considerable interest to characterize the pilot module in terms of pilot zone mixing, fuel placement, flow field, and interaction with the main stage. This contribution focuses on the investigation of soot formation during pilotonly operation. Optical test methods were applied in an optically accessible single sector rig at engine idle conditions. Using planar laser-induced incandescence (LII), the distribution of soot and its dependence on air/fuel ratio, as well as geometric injector parameters, was studied. The data shows that below a certain air/fuel ratio, an increase of soot production occurs. This is in agreement with smoke number measurements in a standard single sector flame tube rig without optical access. Reaction zones were identified using chemiluminescence of OH radicals. In addition, the injector flow field was investigated with PIV. A hypothesis regarding the mechanism of pilot smoke formation was made based on these findings. This along with further investigations will form the basis for developing strategies for smoke improvement at elevated pilot-only conditions.

Item URL in elib:https://elib.dlr.de/87214/
Document Type:Article
Title:Characterization of Lean Burn Module Air Blast Pilot Injector With Laser Techniques
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Meier, Ulrichulrich.meier (at) dlr.deUNSPECIFIED
Freitag, Stefanstefan.freitag (at) dlr.deUNSPECIFIED
Heinze, Johannesjohannes.heinze (at) dlr.deUNSPECIFIED
Lange, LenaLena.Lange (at) dlr.deUNSPECIFIED
Magens, Eggerteggert.magens (at) dlr.deUNSPECIFIED
Schroll, Michaelmichael.schroll (at) dlr.deUNSPECIFIED
Willert, Christianchris.willert (at) dlr.deUNSPECIFIED
Hassa, Christophchristoph.hassa (at) dlr.deUNSPECIFIED
Bagchi, Imon-KalyanRolls-Royce DeutschlandUNSPECIFIED
Lazik, WaldemarRolls-Royce DeutschlandUNSPECIFIED
Whiteman, MichaelRolls-Royce PLC DerbyUNSPECIFIED
Date:December 2013
Journal or Publication Title:Journal of Engineering for Gas Turbines and Power
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:135
DOI :10.1115/1.4025148
Page Range:pp. 121508-1
Editors:
EditorsEmail
UNSPECIFIEDAmerican Socitey of Mechanical Engineers
Publisher:American Society of Mechanical Engineers (ASME)
ISSN:0742-4795
Status:Published
Keywords:aero-engine gas turbine, soot, combustor, lean burn, laser diagnostics
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Propulsion Systems (old)
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Combustion Chamber Technologies (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Combustor
Deposited By: Meier, Dr.rer.nat. Ulrich
Deposited On:07 Jan 2014 14:51
Last Modified:08 Mar 2018 18:42

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