Piston design for jet placement

An internal combustion engine, comprising:

• an engine block having at least one cylinder bore;
• a cylinder head having a flame deck surface disposed at one end of the cylinder bore;
• a piston connected to a rotatable crankshaft and configured to reciprocate within the cylinder bore, the piston having a crown portion facing the flame deck surface such that a combustion chamber is defined within the cylinder bore and between a top surface of the crown portion and the flame deck surface;
• a fuel injector having a nozzle tip disposed in fluid communication with the combustion chamber, the nozzle tip having at least one nozzle opening configured to inject a fuel jet into the combustion chamber and along a fuel jet centerline;
• at least one arcuate indent of a first type formed in the top surface, the at least one arcuate indent of the first type being aligned with the fuel jet centerline and including a first entry surface extending from a central portion of the piston, a first recirculation surface having a concave shape at a first radius and extending along a spiral direction adjacent the entry surface, and a wall extending generally in an axial direction and disposed radially along the first recirculation surface;
• at least one arcuate indent of a second type formed in the top surface and adjacent the at least one arcuate indent of the first type, the at least one arcuate indent of the second type being aligned with a second fuel jet centerline and including a second entry surface extending from a central portion of the piston, a second recirculation surface having a concave shape at a second radius that is smaller than the first radius, the second recirculation surface extending along a plane that is perpendicular to the top surface and intersecting a diameter of the top surface, and a wall extending generally in an axial direction and disposed radially along the second recirculation surface;
• wherein, during operation, a fuel jet provided into the at least one arcuate indent of the first type is arranged to occupy a first region disposed in a radially outward portion of the combustion chamber, and
• wherein, during operation, a fuel jet provided into the at least one arcuate indent of the second type is arranged to occupy a second region disposed in a central portion of the combustion chamber.