DIESEL ENGINE

摘要

During diffusion combustion, squish flows (24) that flow from squish areas (22) into a cavity portion (12b) and that form longitudinal vortex flows in the cavity portion (12b) are generated in the compression stroke. The longitudinal vortex flows have velocity components heading inward in radial directions of a cylinder at an upper portion of the cylinder and velocity components heading outward in the radial directions of the cylinder at a lower portion of the cylinder. Fuel is jetted from nozzles (13a) of an injector (13) that faces the central region of the cavity portion (12b) to the outer periphery of the cavity portion (12b). A ratio of the diameter of the cavity to that of the cylinder bore ranges from 0.66 to 0.76.