Method of injecting ammonia fuel into a reciprocating engine

A method of injection of liquid or gaseous ammonia fuel into a reciprocating engine that includes at least two cylinders, each cylinder including a piston that moves reciprocally within that cylinder, each cylinder having a head location at one end located opposite to a compression end of the piston and defining a combustion chamber therebetween, the cylinder including at least one inlet valve through which combustion gases are fed into the combustion chamber and at least one exhaust valve through which spent combustion gases egress the combustion chamber, the piston moving the cylinder in a cycle between top dead center where the piston is located closest to the head location and bottom dead center where the piston is located furthest from the head location, and including at least one fuel injector located at or in the head location,

• and wherein the method comprises:
• injecting the ammonia fuel into the combustion chamber of each cylinder as at least one fuel jet with a timing of:
• after the at least one exhaust valve of the respective cylinder is substantially closed;
• and
• before the respective piston moves to at most 35 degrees, preferably at most 45 degrees, prior to top dead centre.

A method of injection of liquid or gaseous ammonia fuel into a reciprocating engine that includes at least two cylinders, each cylinder including a piston that moves reciprocally within that cylinder, each cylinder having a head location at one end located opposite to a compression end of the piston and defining a combustion chamber therebetween, the cylinder including at least one inlet valve through which combustion gases are fed into the combustion chamber and at least one exhaust valve through which spent combustion gases egress the combustion chamber, the piston moving the cylinder in a cycle between top dead center where the piston is located closest to the head location and bottom dead center where the piston is located furthest from the head location, and including at least one fuel injector located in the wall of the cylinder spaced away from the head location, the injector being positioned to inject fuel into the combustion chamber, and

• wherein the method comprises:
• injecting the ammonia fuel into the combustion chamber of each cylinder as at least one fuel jet such that the fuel jets enters the combustion chamber having a jet centreline that is at an angle of between −80° and 80° relative to a base line which is perpendicular to the centreline of the respective cylinder, and
• wherein injection is timed to occur:
• after the at least one exhaust valve of the respective cylinder is substantially closed;
• and
• before the at least one fuel injector is covered by the respective piston when moving from bottom dead center to top dead center in each respective cylinder.