Effect of Feedstock Gas on Composition of Combustion Products in Plasma-Assisted Combustion

Abstract

The effect of a plasma feedstock gas on the composition of combustion products in plasma-assisted combustion was investigated by a spectroscopic measurement of an ethylene (C₂H₄) flame ignited and held by a plasma jet (PJ). Spectra of CH, CN and C₂ were detected in emissions from the flame ignited by N₂ PJ. On the other hand, only CH spectrum was detected in emission of the flame ignited by O₂ PJ. A decrease in the CN emission downstream was much faster than those in CH and C₂ emissions. In the case of N₂ PJ, an increase in the electric power to the PJ torch decreased the flame length.