ACTIVE SCAVENGE PRECHAMBER

摘要

In certain embodiments with large size prechambers and/or with prechambers that have large spark-gap electrode assemblies, a poor scavenge of the crevice volume may cause deterioration of the preignition margin, which then may limit the power rating of the engine, may cause the flow velocity field of the fuel-air mixture to be excessively uneven and may result in the deterioration of the misfire limit. One or more auxiliary scavenging ports may allow admission of fuel rich mixture to the crevice volume, thereby cooling the residual gases and preventing occurrence of preignition. More organized and powerful flow velocity fields may be obtained in the spark-gap electrode assembly region. This condition may result in a significant extension of the flammability limit and may significantly improve the combustion efficiency of the prechamber. Passive prechambers using the active scavenge concept may increase the engine power output and reduce the emission of pollutants from engine combustion.

主权项

1. A pre-combustion chamber comprising:
a passive prechamber comprising:
a prechamber comprising an external surface and an internal surface enclosing a prechamber volume;one or more ejection ports communicating between the external surface and the internal surface for introducing a fuel-air mixture into the prechamber volume;a spark-gap electrode assembly, comprising
a primary electrode disposed within the prechamber volume; andone or more ground electrodes disposed within the prechamber volume and offset from the primary electrode to form one or more electrode gaps;a crevice volume; and one or more auxiliary scavenging ports each comprising an inlet for communicating with a main combustion chamber and an outlet communicating with the crevice volume.