Reaction Analysis of Frequency Dependence on Ignition Delay by Repetitive Supply of Active Species

Abstract

The effect of the frequency of discharges on the ignition delay time was investigated using a zero-dimensional reaction analysis. Assuming that the active species are produced instantaneously by nanosecond pulsed repetitive discharges, the reaction pathways for the consumption of O atoms produced by the discharges at different frequency of discharges are compared. Results showed that the time required for the ignition became shortest at a frequency of 20 kHz. The decrease in the reaction rate of between CH₂O and O atoms can be responsible for the increase in the time required for ignition in the high frequency of discharges. The CH₂O concentration during the multiple discharges was determined by the competition between the interval of the discharges and the time scale of the reactions related CH₃O.