Abstract
The 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 security and combustion efficiency in the lean premixed combustion. In this study, the laser-induced ignition phenomenon is investigated experimentally, especially on the relation between the 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 296 K to 450 K at the same number density of molecules. Results clearly show that the ratio of absorption to the plasma increased with the increase of the initial temperature of premixed gas. In addition, the minimum ignition energy decreased with the increase of initial temperature of premixed gas. Eventually, it improves the ignitability of premixed gas by the laser-induced ignition.
