Internal combustion engine and piston having piston bowl

An internal combustion engine comprising:

• a cylinder head defining a cylinder upper surface;
• a cylinder bore having a cylinder bore radius;
• and
• a piston for reciprocating within the cylinder bore, the piston comprising:
• a piston body including an outer cylindrical surface and being defined along a longitudinal piston center axis, the piston body having a first axial piston end and a second axial piston end;
• and
• a piston bowl defined in the first axial piston end, surrounded by an end perimeter surface on the first axial piston end, and configured to receive a fuel,
• a fuel injector configured to deliver fuel into the piston bowl,
• the piston bowl having a half section profile comprising:
• a bowl entry extending radially from the longitudinal piston center axis;
• a first bowl recess extending radially from the bowl entry and defining a bowl depth and a first radius of curvature;
• a second bowl recess extending radially from the first bowl recess to the end perimeter surface and defining a second radius of curvature;
• a bowl lip defined by the first bowl recess and the second bowl recess, the first bowl recess further defining a first bowl recess exit angle at the bowl lip;
• and
• a bowl edge defined by the second bowl recess and the end perimeter surface, the second bowl recess further defining a second bowl recess exit angle at the bowl edge;
• wherein the bowl entry of the piston bowl is configured to initially receive the fuel from the fuel injector, which is spaced from the bowl entry and disposed at the longitudinal piston center axis, before the fuel is directed to the first bowl recess at the bowl lip along the first bowl recess exit angle.