Fuel injection arrangement and a hydrogen internal combustion engine

A fuel injection arrangement for admitting a flow of hydrogen into a combustion chamber of a hydrogen internal combustion engine, the fuel injection arrangement comprising:

• a nozzle cap comprising an inlet arranged at a valve seat and configured to receive a flow of hydrogen, and at least one outlet at a lower portion of the nozzle cap through which the flow of hydrogen is configured to be supplied into the combustion chamber,
• an inlet valve arrangement at least partly housed by the nozzle cap, the inlet valve arrangement being movable between a closed position at which a portion of the inlet valve arrangement is arranged in abutment with the valve seat to prevent hydrogen from entering the inlet, and an open position at which the flow of hydrogen is allowed to flow between the inlet and the outlet, the inlet valve arrangement comprising a valve portion and an axially extending head portion having an upper end arranged at the valve portion, and a lower end facing away from the valve portion, wherein the valve portion comprises a surface arranged in abutment with the valve seat when the inlet valve arrangement assumes the closed position, wherein the inlet valve arrangement comprises an axially extending flow guiding portion forming part of the head portion, wherein the flow of hydrogen is configured to flow along the flow guiding portion between the inlet and the outlet, the axially extending flow guiding portion comprising an envelope surface facing a smooth inner surface of the nozzle cap, wherein the smooth inner surface extends from the valve seat to the lower portion of the nozzle cap, the envelope surface comprising a valve protrusion protruding radially towards the smooth inner surface of the nozzle cap,
• wherein the smooth inner surface of the nozzle cap comprises a nozzle protrusion protruding radially towards the envelope surface of the flow guiding portion, the nozzle protrusion being arranged axially between the valve protrusion and the at least one outlet of the nozzle cap, wherein the valve protrusion and the nozzle protrusion at least partly overlap in a radial direction.