Comparison between conventional and two-stages fuel injection systems for naval applications

High pressures and pressure gradients appear in the combustion chamber during the combustion process.

The plunger-barrel assembly described in this paper comes up with a trick to circumvent this defect: it generates the mechanical two-stage fuel injection. Due to its special construction, the plunger-barrel assembly allows a small amount of fuel to flow into the cylinder just a few milliseconds prior to main injection. The role of the new fuel injection system is highlighted through the comparison between research results (computer simulation, injection bench and engine tests) obtained after investigating conventional and two-stage fuel injection pumps for naval use.