Abstract

Ammonia (${\mathrm{NH}}_3$) is a sustainable fuel with excellent emission characteristics. Hence, it is important to develop diagnostic techniques for ${\mathrm{NH}}_3$ combustion. In this paper, femtosecond laser-induced plasma spectroscopy (FLIPS) was performed in premixed ${\mathrm{NH}}_3/\mathrm{air}$ flames. The plasma emission spectra induced by the femtosecond laser in the flame and the chemiluminescence spectra of the flame itself were both measured. Through calibration, we found that the spectral intensity ratio of NH $(336\mathrm{nm})/{\mathrm{N}}_2$ (337 nm) could be used for equivalence ratio measurements in ${\mathrm{NH}}_3$ combustion flow fields. This work is the first attempt at using a femtosecond laser-based technique for ${\mathrm{NH}}_3$ combustion diagnostics.

© 2019 Optical Society of America

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