Pulse Train Ignition with Passively Q-Switched Laser Spark Plugs Under Engine-like Conditions

Lean combustion and downsizing are two concepts to increase fuel efficiency and to reduce emissions of engines. However, the requirements on the ignition system increase consequently due to increased flow velocity and pressure at the time of ignition. In this context, the application of miniaturized passively q-switched laser spark plugs with pulse train operation provides an alternative to the conventional spark plug. To exploit the full potential of the pulse trains, ignition and combustion processes induced by passively q-switched laser spark plugs are investigated in this study.