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Proceedings Paper

Combined multispecies PLIF diagnostics with kHz rate in a technical fuel mixing system relevant for combustion processes
Author(s): Wolfgang Paa; Dirk Mueller; Annett Gawlik; Wolfgang Triebel
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Paper Abstract

Concentration distributions of formaldehyde were measured in a technical fuel mixing system by Planar Laser Induced Fluorescence (PLIF) using a novel all solid state disk laser system. This compact and efficient laser generates tunable, narrow bandwidth pulses with kHz repetition rate and energies of up to 25 mJ around 1030 nm. After frequency conversion to the UV spectral region, laser pulses with energies of up to 4 mJ excite different combustion relevant species inside of a semi-technical reactor. This reactor generates a homogeneous fuel vapor/air-mixture using the so-called cool flame. Since the mixture of fuel and air is a key factor concerning efficiency of combustion, the fast fuel injection and mixing processes were investigated with this laser system. Directing a light sheet into the reactor and collecting the fluorescence with an intensified CCD camera, we recorded PLIF images of formaldehyde concentration distributions using an excitation wavelength of 343 nm. In this way we characterized the turbulence of the injection process close to the fuel injection nozzle with 1 kHz repetition rate, and proved the excellent homogeneity of the fuel-air mixture close to the end of the reactor, where fuel-air mixture was burned in a hot flame. By means of scattered light from fuel droplets the mean flow velocity could be estimated. In the hot flame above the reactor spectrally resolved LIF of OH radicals could be recorded.

Paper Details

Date Published: 18 August 2005
PDF: 8 pages
Proc. SPIE 5880, Optical Diagnostics, 58800N (18 August 2005); doi: 10.1117/12.616769
Show Author Affiliations
Wolfgang Paa, Institut fuer Physikalische Hochtechnologie (Germany)
Dirk Mueller, Institut fuer Physikalische Hochtechnologie (Germany)
Annett Gawlik, Institut fuer Physikalische Hochtechnologie (Germany)
Wolfgang Triebel, Institut fuer Physikalische Hochtechnologie (Germany)

Published in SPIE Proceedings Vol. 5880:
Optical Diagnostics
Leonard M. Hanssen; Patrick V. Farrell, Editor(s)

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