Abstract

Temporal and spatial scale of laser ignition is discussed in the presentation. The required time and space for ignition are obtained from experimental results of laser ignition to lean premixed mixture packed in the constant volume combustion vessel. Results indicated that the required temporal and spatial scale for laser ignition are affected by the initial conditions of the premixed mixture; i.e. initial pressure, initial temperature and excess air ratio. For the spatial scale of plasma, the high incident intensity of laser pulse required for generating larger volume of plasma under the lean condition. For the temporal scale, it was found from ultra-high speed imaging that the light emission from plasma formed by laser induced breakdown remains several tens of nano-second.

© 2017 Optical Society of America