In order to optimize the geometric construction of air plasma igniter and improve the working performance of igniter

we investigated the discharge characteristic

spectral characteristic

jet characteristic and ignition characteristic of igniter

varying with swirler chamfer angles（0°

15°

30° and 45°）. The experimental results show that breakdown voltage

amplitude of electrical signal and breakdown time decrease with the increase of swirler chamfer angle during the arc breakdown process. During the arc maintenance process

the level of arc shunt and the anode erosion rate will decrease with the increase of swirler chamfer angle. The electron temperature and rotation temperature of plasma jet increase firstly and then decrease with the increase of the swirler chamfer angle

while the vibration temperature of plasma jet decreases firstly and then increases when the swirler chamfer angle increases. The ability of antagonizing exogenous flow disturbances improves when the swirler chamfer angle decreasing

and the penetration capacity of igniter jet will be improved.The ignition delay time of kerosene-air mixture decreases firstly and then increases with the increase of the swirler chamfer angle. The igniter jet temperature will be the highest

and the ignition delay of kerosene-air mixture will be the shortest when the swirler chamfer angle is 30°

compared with other swirler chamfer angles.