Taking a four-cylinder compression-ignition aero kerosene piston engine as the research model

AMESim (advanced modeling environment for performing simulation of engineering systems) simulation software was used to establish the engine model

and the simulation model was verified with the data collected from the engine bench test. In the high-altitude environment

the influence relationship of the combustion characteristic

performances and NOx emission characteristics of the engine between different nozzles and diameters' injector schemes under the takeoff condition and the maximum cruising condition of the aircraft was simulated and analyzed. The results showed that

under steady-state conditions

the maximum combustion pressure and temperature increased with the increasing numbers of nozzle-hole

and the heat release rates also increased rapidly with the peak value. In addition

when the premixed-combustion in the cylinder was strengthened and the combustion starting point was advanced

the ignition delay period and combustion duration were shortened

the combustion center moved forward

and the cycling thermal efficiency was higher

but the NOx emission was increased. Under the takeoff condition of the aircraft with the transient altitude change

multi-holes and small-diameters of fuel nozzle were conducive to the recovery of engine power in the high-altitude environment

improving the dynamics and the continuous flying performance of aircraft.