Effects of Initial Temperature of Premixed Gas on Ignition by Use of Laser-Induced Breakdown(Thermal Engineering)

Abstract

Laser-induced ignition gathers attention as the relatively new technique of ignition owing to its flexibility of ignition point that could be of benefit for stability and combustion efficiency in the lean premixed combustion. In this study, the laser-induced ignition phenomena have been investigated experimentally, especially on the relation between the initial temperature of the premixed gas and the minimum ignition energy. Methane/air mixture is used as the premixed gas. The initial temperature of premixed gas is varied from 300K to 450K under the constant molar density. Results clearly show that the absorption energy to the plasma is not affected by the increase of the initial temperature of premixed gas. In addition, the minimum incident energy for ignition decreases with the increase of initial temperature of premixed gas. Eventually, the increase of the initial temperature improves the ignitability of premixed gas by the laser-induced ignition.