Summary

The time-resolved spatial distribution of temperature for the transient laser-induced ignition of ammonia / oxygen mixtures is presented. Planar laser-induced fluorescence (PLIF) of OH was used to measure the temperature distribution by means of two selected transition lines observed using a steady flame to provide the collision quenching correction over the necessary range of temperatures. Information on the spatial and temporal evolution of gas temperature and species concentrations is essential for numerical modeling of laser spark ignition.