So far, there are two main ways of spark plug flashover: one is to generate an electric spark by the air gap between the center electrode and the side electrode under the action of pulse high voltage; the other is the flashover along the surface, that is, the discharge route. It is carried out along the surface of the insulator between the center electrode and the side electrode. The former has a short discharge distance and poor flashover performance, especially in the case of a conventional one-sided pole spark plug. Because the size of the air gap is limited by the power supply voltage, it is generally about 0.6 to 0.9 mm. The shorter discharge distance makes the fire core not fully "developed", and the heat is absorbed by the side electrode more, which reduces the energy of the spark.
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