COMBUSTION SYSTEM FOR AN INTERNAL ENGINE

Abstract

A combustion system for an internal combustion engine is provided. The combustion system comprises a cylinder extending along a longitudinal axis, a cylinder head mounted on the cylinder, and a piston configured to move back and forth within the cylinder along the longitudinal axis between top dead center and bottom dead center. The piston includes a piston bowl containing a dome that tapers to a dome apex. The dome apex includes a bulge, an annular projection spaced from and surrounding the bulge, and an annular recessed surface located between the bulge and the annular projection.The bulge and the annular projection each extend upwards from the annular recessed surface, such that the bulge, the annular projection, and the annular recessed surface define an annular groove between them. The combustion system further comprises a combustion chamber defined by the cylinder, the cylinder head, and the piston.