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Spark plug electric field

gap electric stress

Problem Type: electrostatics.

Geometry: 3D import.

Spark plug electric model

Given:
Relative permittivity of air ε0 = 1,
Relative permittivity of insulator εr = 5,
High DC voltage V = 15 kV.

Task:
Calculate the electric field stress distribution in the spark plug air gap.

Solution:
We simulate only the area around the spark gap. The other parts of the spark plug are excluded.
To overcome 3D import limitations (only single body topology is allowed) we added small air gap within the internal part of the high voltage electrode, which does not affect the physics but converts the topology to a single-body one.

Results:

Electric field distribution in the spark gap:

spark gap electric stress

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