On nanosecond plasma-assisted ammonia combustion: Effects of pulse and mixture properties

In this study, the effects of nanosecond plasma discharges on combustion characteristics ammonia are investigated over a wide range mixture properties and settings. The results reveal that impacts change non-monotonically by altering reduced electric field value. Within studied field, i.e., 100–700 Td, it is shown most effective in medium range, e.g., 250–400 Td. At lower values, main fraction energy consumed to excite diluent higher vibrational levels. very high substantial portion transferred into ionization reactions diluent, which compromises excitations fuel oxidizer species. terms pulse density, indicate an increase 0–20 mJ/cm3, at given decreases ignition delay time five orders magnitude, increases laminar flame speed up order depending composition. show discharge produces more radicals, electronically excited charged species when He used as instead N2, since NH3 O2 strengthened NH3/O2/He. Moreover, highly assisting preheated lean mixtures. present study also indicates thickness minimum critical density 12–14 mJ/cm3. Further can manipulate inner structure flame, pre-heat zone include some levels chemical toward flameless mode combustion.