Studies Regarding the Influence of the Squish In-Cylinder Movement of the Air in a Diesel Engine

Abstract

The objective of this paper is to establish the influence of the in-cylinder squish motion of the air on the turbulence inside the cylinder, which leads to a different output: effective power and torque. The simulation was implemented in AVL FIRE ESE DIESEL in order to simplify the simulation and reduce the simulation time. The engine that was implemented is a Mercedes-Benz E220 engine type OM611 220 CDI, 92 kW, because the piston can be cut through to measure the precise shape so that the simulation is as close as possible to the real combustion chamber. In order to modify the squish, the distance from the piston to the cylinder head was mod-ified (standard is 1 mm and it was modified to 0.5 mm, 1.5 mm and 2 mm), but the compression ratio was kept the same so as to not influence the performance indices.