What makes ignitor plugs less susceptible to fouling in turbine engines?

Ignitor plugs in turbine engines are designed to create high-energy sparks that significantly enhance their effectiveness and reliability during the ignition process. The primary reason why a high energy spark contributes to reduced susceptibility to fouling is that it provides a more intense and focused ignition event. This high energy discharge is capable of ensuring that the fuel-air mixture ignites more efficiently and consistently, even amidst varying operational conditions, such as low temperature or adverse environmental factors.

The robust ignition created by a high-energy spark helps in preventing the accumulation of unburnt fuel residues and other contaminants on the ignitor plug, which are common causes of fouling. By promoting rapid and complete combustion, the high energy spark minimizes the likelihood of deposits forming, thereby maintaining the functionality of the ignitor over longer periods and under extreme conditions.

Other factors such as low temperature sparks, environmental resistances, and chemical coatings may have roles in different performance aspects or longevity of the ignitor plugs, but the high-energy spark directly influences the ignition quality and reduces the risk of fouling due to mild or incomplete combustion issues.