Investigation of BAM:Eu2+ particles as a tracer for temperature imaging in flames

The capabilities of the joint temperature-velocity imaging technique, thermographic particle image velocimetry (TPIV), are examined in H₂ laminar diffusion flames by seeding the fuel stream with BAM:Eu²⁺ particles. The upper measurable temperature is found to be 900-1000 K. For these phosphor particles this limit is primarily imposed by thermal quenching of the laser-induced luminescence emission that is used for thermometry. Within this limit, the measured temperature distribution quantitatively agrees with a numerical simulation. It is also shown that the luminescence signal per phosphor particle is not influenced by passing the particles through a high temperature reaction zone.