A fuel ignition device for an engine having a plurality of cylinders. The fuel ignition device including an active pre-chamber, the active pre-chamber further including a fuel inlet for introducing fuel into the active pre-chamber, a spark plug configured to ignite a fuel-air mixture in the active pre-chamber, and a plurality of holes arranged circumferentially around a lower end of the active pre-chamber, the plurality of holes being configured to provide fluid communication between the central chamber and a combustion main chamber of the gas engine.

The present invention discloses a prechamber jet disturbance intensified combustion system, comprising a main combustion chamber and a main fuel injector, the lower end of a fuel nozzle of the main fuel injector is located inside the main combustion chamber; a plurality of prechambers are arranged outside the main combustion chamber, the prechambers are connected with the main combustion chamber by prechamber channels, an auxiliary fuel injector is arranged outside each prechamber, and the lower end of a fuel nozzle of the auxiliary fuel injector is located inside the corresponding prechamber. The present invention abandons layout and combustion process idea of an existing heavy-duty diesel engine combustion system, which remarkably increases the mixing rate of fuel and air and the combustion rate by using autonomous and controllable parts, materials and process conditions.

Various aspects of the present disclosure are directed to a cylinder head for an internal combustion engine. In one example embodiment, the cylinder head includes at least one spark plug having at least one earth electrode, a precombustion chamber accommodating the at least one spark plug, and a fuel channel which leads into the precombustion chamber. The fuel channel having a flow axis at an outlet that is oriented in the direction of the at least one earth electrode. An axis of rotation of the at least one spark plug has an offset with respect to the flow axis between 0 and 15% of the greatest precombustion chamber diameter.

The ignition insert with an active pre-chamber (1) comprises an insert well (72) arranged in a cylinder head (3) of an internal combustion engine (2), said well (72) accommodating a cylindrical insert body (70) which is indexed in rotation and in which are arranged an ignition pre-chamber (71), an insert spark plug well (83) receiving a spark plug (12), and a injector radial orifice (88) which is aligned with a injector lateral well (73) arranged in the cylinder head (3) so as to receive an injector nose (16), said body (70) being terminated by a pre-chamber nose (75) opening into a combustion chamber (5), and being held in the insert well (72) by fixing means (82) cooperating with clamping means (74).

A precombustion chamber gas engine includes a main-chamber forming portion forming a main combustion chamber, and a precombustion-chamber forming portion forming a precombustion chamber communicating with the main combustion chamber via a plurality of nozzle holes. The precombustion-chamber forming portion includes a cylindrical portion extending along an extension direction of a precombustion chamber central axis of the precombustion-chamber forming portion, and a tip portion closing a main-combustion-chamber-side end of the cylindrical portion and having the nozzle holes. The tip portion includes a thin region having a thickness T satisfying T<L where L is a length of each nozzle hole.

A precombustion chamber gas engine includes a main-chamber forming portion forming a main combustion chamber, a precombustion-chamber forming portion forming a precombustion chamber communicating with the main combustion chamber via nozzle holes, and an ignition device disposed in the precombustion chamber and having an ignition portion spaced from the main chamber central axis at a predetermined distance. In a plan view, the precombustion chamber has a near-ignition region including the ignition portion and a far-ignition region opposite to the near-ignition region separated by a borderline passing through the precombustion chamber central axis and perpendicular to a straight line passing through the precombustion chamber central axis and the ignition portion. The cross-sectional area of a specific near nozzle hole which is at least one nozzle hole in the near-ignition region is smaller than the cross-sectional area of a specific far nozzle hole which is at least one nozzle hole in the far-ignition region.

A pre-chamber spark plug for a combustion chamber of an internal combustion engine includes a pre-chamber with a plurality of openings where the pre-chamber is fluidically connectable to the combustion chamber via the plurality of openings. The plurality of openings are configured to cause a tumbling flow of a fuel/air mixture flowing into the pre-chamber from the combustion chamber via the plurality of openings. At least two of the openings of the plurality of openings have diameters which differ from one another. At least two of the openings of the plurality of openings enclose angles from a main axis of the pre-chamber which differ from one another.

Systems are provided for a pre-chamber. In one example, a pre-chamber comprises a passage outside of a primary combustion chamber for flowing fuel directly from a fuel injector to an interior volume of the pre-chamber.

A method of combusting fuel, e.g. heavy fuel, in a rotary engine, including injecting a main quantity of fuel directly into a combustion chamber to form a first fuel-air mixture having a first air-fuel equivalence ratio λ higher than 1, injecting a pilot quantity of fuel into a pilot subchamber to form a second fuel-air mixture having a second air-fuel equivalence ratio λ smaller than the first air-fuel equivalence ratio, igniting the second fuel-air mixture within the pilot subchamber, using the ignited second fuel-air mixture from the pilot subchamber to ignite the first fuel-air mixture, and injecting a supplemental quantity of fuel directly into the combustion chamber after igniting the first fuel-air mixture, upstream of an exhaust port of the rotary engine with respect to a direction of rotation of the rotor. A rotary engine with interburner fuel injector is also discussed.

An internal combustion engine is provided with a pre-chamber provided inside a main combustion chamber. The pre-chamber includes an ignition plug, and a casing provided to a ceiling part to cover the ignition plug, the casing isolating an internal space formed therein from the main combustion chamber. A tumble flow of a mixture gas is formed inside the main combustion chamber. A plurality of communicating holes are formed in the casing, and include a first communicating hole opening to an intake port side and a second communicating hole opening to an exhaust port side. The tumble flow flowing into the pre-chamber through the first communicating hole forms in the pre-chamber a vortex flowing in the opposite direction from the tumble flow. The main combustion chamber is provided with a structure configured to suppress a flow opposing the vortex flowing into the pre-chamber through the second communicating hole.