title: Soot volume fraction fields in unsteady axis-symmetric flames by continuous laser extinction technique.
abstract: A Laser Extinction Method has been set up to provide two-dimensional soot volume fraction field time history at a tunable frequency up to 70 Hz inside an axis-symmetric diffusion flame experiencing slow unsteady phenomena preserving the symmetry. The use of a continuous wave laser as the light source enables this repetition rate, which is an incremental advance in the laser extinction technique. The technique is shown to allow a fine description of the soot volume fraction field in a flickering flame exhibiting a 12.6 Hz flickering phenomenon. Within this range of repetition rate, the technique and its subsequent post-processing require neither any method for time-domain reconstruction nor any correction for energy intrusion. Possibly complemented by such a reconstruction method, the technique should support further soot volume fraction database in oscillating flames that exhibit characteristic times relevant to the current efforts in the validation of soot processes modeling.
authors.affiliation: UPMC Univ Paris 06, CNRS UMR 7190, Institut Jean le Rond d’Alembert, Paris, France.
authors.forename: Muhammad
authors.initials: M
authors.lastname: Kashif
authors.forename: Jérôme
authors.initials: J
authors.lastname: Bonnety
authors.forename: Philippe
authors.initials: P
authors.lastname: Guibert
authors.forename: Céline
authors.initials: C
authors.lastname: Morin
authors.forename: Guillaume
authors.initials: G
authors.lastname: Legros
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D006358:Hot Temperature; D017745:Incineration; D007834:Lasers; D010783:Photometry / Q000295:instrumentation*; D053260:Soot / Q000032:analysis* / Q000737:chemistry*
chemical_list: D053260:Soot