DIESEL ENGINE, MOTOR VEHICLE AND METHOD FOR REDUCING HEAT TRANSFER TO A PISTON OF A CYLINDER OF A DIESEL ENGINE

摘要

A diesel engine comprising at least one cylinder (1) with a piston (2) having a piston bowl (3). A fuel injector (6) is configured t o direct a fuel spray towards a target area (21) on an annular wall section (22) of the piston bowl so as to make a flame (20) formed by ignition of the fuel spray hit the target area. The target area borders, via a flow separation edge (23), on a lowered flow separation area (24) on said annular wall section so as to give this annular wall section a stepped configuration. Said flow separation edge and flow separation area are configured to induce the formation of a vortex-filled wake between the flame and the flow separation area on the downstream side of the flow separation edge when the flame flows from the target area, across the flow separation edge and over the flow separation area.