DIESEL ENGINE

摘要

When diffusion combustion is performed, a squash flow (24) flows from a squash area (22) into a cavity portion (12b) during the compression stroke, the squish flow (24) is generated to form in the cavity portion (12b) a longitudinal vortex flow, in which a flow at an portion in the cylinder, has a velocity component directed inward in a radial direction of the cylinder and a flow at a lower portion in the cylinder has a velocity component directed outward in a radial direction of the cylinder. Fuel is injected from nozzle holes (13a) at injector (13), which is disposed top face the center portion of the cavity portion to to an outer peripheral portion of the cavity portion (12b), and a ratio between the diameter or the cavity and the diameter of a cylinder bore falls within a range of 0.66 to 0.76.