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Optical Methods for Studies of Self-Excited Oscillations and the Effect of Dampers in a High Pressure Single Sector Combustor

Meier, Ulrich und Lange, Lena und Heinze, Johannes und Hassa, Christoph und Sadig, Sermed und Luff, Darren (2014) Optical Methods for Studies of Self-Excited Oscillations and the Effect of Dampers in a High Pressure Single Sector Combustor. In: Proceedings of the ASME Turbo Expo, 4A, V04AT04A060. ASME Turbo Expo 2014: Turbine Technical Conference and Exposition, 16.-20- Jun. 2014, Düsseldorf. doi: 10.1115/GT2014-25873. ISBN 978-0-7918-4568-4.

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Offizielle URL: http://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=1907940

Kurzfassung

Self-excited periodic instabilities in a staged lean burn injector could be forced by operating the combustor at off-design conditions. These pressure oscillations were studied in a high pressure single sector combustor with optical access. Two damper configurations were installed and tested with respect to their damping efficiency in relation to the configuration without dampers. For a variety of test conditions, derived from a part load case, time traces of pressure in the combustor were measured, and amplitudes were derived from their Fourier transformation. These measurements were performed for several combinations of the operating parameters, i.e., injector pressure drop, air/fuel ratio, pilot/main fuel split and preheat temperature. These tests “ranked” the respective damper configurations and their individual efficiency with respect to the configuration without dampers. Although a general trend could be observed, the ranking was not strictly consistent for all operating conditions. For several test cases, preferably with pronounced self-excited pressure oscillations, phase-resolved planar optical measurement techniques were applied to investigate the change of spatial structures of fuel, reaction zones and temperature distributions over a period of an oscillation. A pulsating motion was detected for both pilot and main flame, driven by a pulsating transport of the liquid fuel. This pulsation, in turn, is caused by a fluctuating air velocity, in connection with a prefilming airblast type atomizer. A phase shift between pilot and main injector heat release was observed, corresponding to a shift of fuel penetration. Local Rayleigh indices were calculated qualitatively, based on phase-resolved OH chemiluminescence used as marker for heat release, and corresponding pressure values. This identified regions, where a local amplification of pressure oscillations occurred. These regions were largely identical to the reaction regions of pilot and main injector, whereas the recirculation zone between the injector flows was found to exhibit a damping effect.

elib-URL des Eintrags:https://elib.dlr.de/94604/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Optical Methods for Studies of Self-Excited Oscillations and the Effect of Dampers in a High Pressure Single Sector Combustor
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Meier, Ulrichulrich.meier (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Lange, LenaLena.Lange (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Heinze, Johannesjohannes.heinze (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Hassa, Christophchristoph.hassa (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Sadig, SermedRolls-Royce Deutschland Ltd & Co KG, Blankenfelde-MahlowNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Luff, DarrenRolls-Royce Plc UKNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:Juni 2014
Erschienen in:Proceedings of the ASME Turbo Expo
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Nein
Band:4A
DOI:10.1115/GT2014-25873
Seitenbereich:V04AT04A060
Name der Reihe:ASME Proceedings: Combustion, Fuels and Emissions
ISBN:978-0-7918-4568-4
Status:veröffentlicht
Stichwörter:combustion diagnostics, fuel injector, aeroengine, high pressure combustion, laser diagnostics, pressure oscillation, staged combustor
Veranstaltungstitel:ASME Turbo Expo 2014: Turbine Technical Conference and Exposition
Veranstaltungsort:Düsseldorf
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:16.-20- Jun. 2014
Veranstalter :International Gas Turbine Institute
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Antriebssysteme
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L ER - Engine Research
DLR - Teilgebiet (Projekt, Vorhaben):L - Brennkammertechnologien (alt), L - Virtuelles Triebwerk und Validierungsmethoden (alt)
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Antriebstechnik > Brennkammer
Institut für Antriebstechnik > Triebwerksmesstechnik
Hinterlegt von: Willert, Dr.phil. Christian
Hinterlegt am:16 Jan 2015 14:47
Letzte Änderung:05 Feb 2018 11:00

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