The invention proposes a method for improving strength of an insulator at a discharging end of an ignition electric
nozzle of
aviation engine. The total length of the insulator and a central electrodeis maintained unchanged, the size of an insulator part and the size of a central
electrode part are changed, and conical-
surface matching between the central
electrode and the insulator is changed tostraight-
surface matching; with regard to the insulator, the discharging end of the insulator is changed to a straight surface to a
conical surface, the wall thickness of an end part is increased by0.5
millimeter, the size of an inner hole of the discharging end is Phi 2.8 millimeters, the chamfer angle of the end part is 60 degrees, and the
axial length of the chamfer angle at the end part is 0.5
millimeter; a straight table is additionally arranged at an outer circle of the insulator, and the situation that a bottom surface of the shell cannot be completely cleared to cause
point contact is prevented; and with regard to the central
electrode, the
conical surface of the discharging end of the central electrode is changed to the straight surface, and the
diameter of the discharging end of the central electrode is Phi 2.8 millimeters. The characteristics of ignition concentration and high efficiency of a sunken structure are maintained, meanwhile, the stress of a discharging end partof the insulator is reduced, the application requirement applicable to the engine environment is met, and a reliable main ignition electric
nozzle is provided for the engine.