Focusing on knocking-influenced factors including excess air coefficient

spark advance angle and compression ratio

investigations on methods to suppress the knocking of piston-type aviation kerosene engine and sensitivity analysis of relevant factors were conducted on a self-developed engine. The results showed that the decrease of excess air coefficient cannot suppress the knocking of aviation kerosene effectively; retarding ignition timing can reduce knocking intensity

but if the spark advance angle was delayed till the knocking was eliminated

the combustion thermal efficiency and output power lost 10%-15%; reducing compression ratio turned out to be effective to restrain the knocking of aviation kerosene

but when compression ratio was reduced from 9 to 7

the output power had an approximate 30% loss. Sensitivity analysis shows that knocking intensity of aviation kerosene is most sensitive to the change of compression ratio

and the change of the excess air coefficient of mixture slightly influences the knocking intensity.