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Frequency scanning filtered Rayleigh scattering in combustion experiments

Doll, Ulrich und Fischer, Michael und Stockhausen, Guido und Willert, Christian (2012) Frequency scanning filtered Rayleigh scattering in combustion experiments. 16th International Symposium on Applications of Laser Techniques to Fluid Mechanics, 09-12 Jul 2012, Lisbon, Portugal.

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Offizielle URL: http://ltces.dem.ist.utl.pt/lxlaser/lxlaser2012/program.asp

Kurzfassung

To increase the overall efficiency in aero engines as well as stationary gas turbines detailed information on flow field properties under realistic operating conditions are required. While conventional probe based technology is readily available and thoroughly tested, most of these techniques are point-wise. To gain insight into complex flow structures spatially and temporally resolved data is needed. Planar optical measurement techniques are capable of providing this type of data in a cost effective manner. The paper describes an image based filtered Rayleigh scattering (FRS) technique that, on frequency scanning a narrow linewidth light source, provides time averaged temperature (or density) fields. FRS uses molecular absorption to attenuate elastically scattered light from surfaces or particles in the flow. The filtered light is collected by a camera sensor at a multitude of light source frequencies allowing the temperature to be inferred from the pixel intensities. The measurement technique is validated on a McKenna type premixed flame and shows a better than 2% agreement to corresponding single point CARS measurements. The technique is further applied on a pressurized single sector combustor in an effort to visualize and quantify the cooling film on an effusion cooled combustor liner wall. In this case the light sheet was directed straight onto the wall and aligned with a single row of effusion holes. Due to the molecular filtering the laser flare on the wall was completely attenuated in the acquired images allowing temperature measurements to within a tenth of a millimeter from the liner wall.

Dokumentart:Konferenzbeitrag (Vortrag, Paper)
Titel:Frequency scanning filtered Rayleigh scattering in combustion experiments
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Doll, Ulrichulrich.doll@dlr.de
Fischer, Michaelmichael.fischer@dlr.de
Stockhausen, Guidoguido.stockhausen@dlr.de
Willert, Christianchris.willert@dlr.de
Datum:11 Juli 2012
Referierte Publikation:Ja
In ISI Web of Science:Nein
Seitenbereich:Seiten 1-12
Name der Reihe:Conference Proceedings online
Status:veröffentlicht
Stichwörter:filtered Rayleigh scattering, molecular absorption filter, temperature measurement, laser diagnostics, combustion diagnostics, effusion cooling, coherent anti-Stokes Raman scattering, CARS
Veranstaltungstitel:16th International Symposium on Applications of Laser Techniques to Fluid Mechanics
Veranstaltungsort:Lisbon, Portugal
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:09-12 Jul 2012
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Antriebe
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L ER - Antriebsforschung
DLR - Teilgebiet (Projekt, Vorhaben):L - Virtuelles Triebwerk und Validierungsmethoden
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Antriebstechnik > Triebwerksmesstechnik
Hinterlegt von: Dr.phil. Christian Willert
Hinterlegt am:22 Aug 2012 11:16
Letzte Änderung:12 Dez 2013 21:45

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