Pre-chamber of internal combustion engine

A method for operating an internal combustion engine including a main combustion chamber and a pre-chamber, the method comprising:

• flowing a mixture of main fuel and air from the main combustion chamber into the pre-chamber via a flow transfer passage fluidly connecting the pre-chamber and the main combustion chamber, the flow transfer passage including a venturi constriction;
• supplying an enrichment fuel into the pre-chamber to generate an enriched mixture in the pre-chamber by mixing the mixture of main fuel and air from the main combustion chamber and the enrichment fuel;
• generating a static pressure in the venturi constriction that is less than a static pressure in the pre-chamber, as a result of a venturi effect in the venturi constriction, by the flowing the mixture of main fuel and air through the venturi constriction toward the pre-chamber;
• drawing a flow of the enriched mixture from the pre-chamber into the flow transfer passage via at least one backflow channel by the venturi effect in the venturi constriction, the at least one backflow channel extending from a first backflow aperture through an internal surface of the pre-chamber to a second backflow aperture through an internal surface of the venturi constriction;
• and
• enriching a fuel concentration in the flow transfer passage by mixing the mixture of main fuel and air from the main combustion chamber and the enriched mixture from the pre-chamber drawn through the at least one backflow channel by the venturi effect.

An engine comprising:

• a piston disposed in sliding contact with a cylinder wall, the piston and the cylinder wall at least partly defining a main combustion chamber;
• a pre-chamber body including a wall having a thickness extending from an internal surface of the pre-chamber body to an external surface of the pre-chamber body,
• the internal surface defining a pre-chamber and a flow transfer passage within the pre-chamber body,
• the wall defining a flow transfer channel extending from a flow transfer inlet aperture to a flow transfer outlet aperture, the flow transfer inlet aperture being defined by the internal surface, the flow transfer outlet aperture being defined by the external surface, the pre-chamber being in fluid communication with the main combustion chamber via the flow transfer outlet aperture,
• the wall further defining at least one backflow channel extending from a first backflow aperture to a second backflow aperture, the first backflow aperture being defined by the internal surface and being located in the pre-chamber, the second backflow aperture being located along the flow transfer channel;
• an ignition device operably coupled to the pre-chamber to ignite a mixture therein;
• and
• a fuel supply device fluidly connected to the pre-chamber to supply fuel, the fuel supply device being in fluid communication with the flow transfer passage via the pre-chamber.