A LARGE TWO-STROKE UNIFLOW SCAVENGED GASEOUS FUELED ENGINE AND METHOD FOR REDUCING PREIGNITION/DIESEL-KNOCK

摘要

A large two-stroke turbocharged uniflow scavenged internal combustion engine comprising a combustion chamber delimited by a cylinder liner (1), a piston (10) and a cylinder cover (22), scavenge air ports (18) arranged in the cylinder liner (1), an exhaust gas outlet arranged in the cylinder cover (22) and controlled by an exhaust valve (4), a plurality of gaseous fuel admission openings (34) arranged in the cylinder liner (1) for admitting a gaseous fuel received via the gaseous fuel valve (30) from a supply of pressurized gaseous fuel (40) into the combustion chamber, a combustion gas outlet connected to the combustion chamber and controlled by a combustion gas valve (26), a combustion gas flow path extending from an outlet of the combustion gas valve (26) to an inlet of the gaseous fuel valves (30), or to an inlet of a dedicated combustion gas injection valve (36), the engine being configured to inject the gaseous fuel with the combustion gas admission openings (34) and the combustion gas with the gas admission openings (34) or with the dedicated combustion gas injection valve (36) simultaneously, sequentially or with overlap into the combustion chamber in a fuel injection event to increase the momentum of the matter injected into the combustion chamber in the fuel injection event.