Based on the bench test and the numerical simulation over a complete working cycle

the effect of the piston head shape of a gasoline engine on detonation sensitivity was studied. By using the bench test data as the benchmark to correct the performance model of the gasoline engine

the mapping simulation for the compression of 9 to 16 was used to obtain an optimal engine map with a compression ratio of 12. The combustion characteristics of three different piston head shaped combustion chambers was analyzed by numerical simulation using the chemical reaction kinetics ion analysis method at the speed of 3500 r/min and full load with a compression ratio of 12

which shows that the SABCD scheme with rear-connected standing vortex connection channel on the piston head has the best anti-detonation properties

and the connection channel between the ignition standing vortex region and valve obstacle avoidance region has a significant impact on detonation sensitivity. By optimizing the key parameters of connection channel of the SABCD scheme

the detonation sensitivity of the piston head is the lowest when the width and depth of the connection channel are both 4 mm. Research results show that a reasonable design of the piston head shape can effectively suppress the combustion chamber's sensitivity to detonation

while increasing the compression ratio of the gasoline engine.