A SIMULATION STUDY OF THE INFLUENCE OF THE RELATIVE HEAT RELEASE DURING COMBUSTION ON THE INDICATOR DIAGRAM OF A DIESEL ENGINE

Valyo Nikolov

Abstract: This article presents the results, obtained in MATLAB environment with a Simulink computer simulation model for the study of the processes of the working cycle of the four-stroke internal combustion engine, of numerical experiments conducted at three different values of the parameter in the Vibe function, whereby three versions of the relative heat release law are determined. After choosing the average pressure indicator of the working cycle for optimality criterion, the optimal values of the beginning of the heat release for the selected three variants of the relative heat release law are determined. After adoption of the limited maximum value of the pressure of the working substance, numerical experiments have been established under various values of the compression ratio and the filling pressure. The values of the compression ratio and the filling pressure are fixed, under which the resulting maximum pressure value of working substance is not greater than the permissible limits.

Keywords: Internal combustion engines, diesel engines, simulation study.

DOI: https://doi.org/10.15623/ijret.2014.0309026