Development of coupled optical techniques for the measurements of soot and precursors in laboratory flames and aero-engine technical combustors

International audience; This work is focused on the development of planar in-situ laser-based methods serving for the mapping of soot precursors and soot particles in hash combustion conditions. We target the soot molecular precursors and particulates because there are still unanswered questions related to the mechanisms leading to the formation of soot particles and their quantification in harsh combustion conditions. Laser-induced incandescence (LII) at 1064 nm is coupled with laserinduced fluorescence (LIF) at 532 nm to monitor soot and its precursors, respectively, on the MICADO test rig. A progressive approach is followed to implement the optical techniques, where LII/LIF is first tested and evaluated in a laminar diffusion flame, stabilized on a coflow burner at atmospheric pressure. Measurements of soot volume fraction and soot precursors are reported in combustion conditions similar to the cruise cycle in terms of total mass flow rate and pressure into the combustor.