MODELING AND SIMULATION OF THE THERMODYNAMIC OPERATING CONDITIONS OF THE CI ENGINE

Abstract

The article presents comparative results of a diesel combustion engine (AVL 5804) along with their simulation analysis. The simulation was performed using the AVL Fire 2017 software. The article focused on the indicated pressure changes in the compression and expansion strokes and on the fuel combustion process. Based on the recorded pressure characteristics in the engine cylinder and its basic construction data, a simulation was per-formed in which specific initial conditions and models of injection, evaporation and fuel combustion were included. A close resemblance between the test results and the simulation results was observed. The largest discrepancies in the analyzed quantities concerned the pre-flame processes, which means that these issues should inform about the quality of the pressure characteristic and the heat release rate modeling in the cylinder of the internal combustion engine.

Keywords
simulation, modelling, dynamic processes