Ultrafast Heating in Nanosecond Repetitively Pulsed Discharges in Air at Atmospheric Pressure: Temperature and Absolute Density Measurements

摘要

Nanosecond Repetitively Pulsed Discharges were proven to be efficient in flame stabilization. A two-step mechanism was proposed to explain the increased reactivity afforded by the discharge. This mechanism first creates excited nitrogen states, which then dissociate molecular oxygen into atomic oxygen through quenching reactions. The temperature of the gas during the discharge was investigated using Optical Emission Spectroscopy on the second positive system of nitrogen, and simulated spectra from SPECAIR. These results were compared with temperatures deduced from Schlieren images taken right after the discharge. The absolute density of N_2(C) was deduced from the experimental calibrated spectra compared to simulated spectra.