Recently “plasma-assisted combustion”, especially for the use of non-equilibrium plasma for ignition has
garnered interest as a new combustion technology for high efficiency and low emissions in combustors such as internal
combustion engines. In this paper the focus is placed on the review of non-thermal plasma ignition and introduction of
authors’ recent results of this field. The ignition characteristics of non-thermal plasma are examined and compared with
those of a conventional spark ignition. It is shown that a streamer discharge characterized by non-thermal plasma can ignite
combustible mixtures as well as conventional thermal plasma and there are also some advantages, such as volumetric ignition
and less heat loss. Through OH LIF measurement, a number of OH radical is shown to accumulate from pulse to pulse during
a train of repetitive pulses, and the created radicals can initiate chemical chain reaction, which results in ignition finally.
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