Development of a zero-dimensional diesel combustion model - Part 1: analysis of the quasi-steady diffusion combustion phase

摘要

The aim of this work is to identify and quantify the influence of injection parameters and running conditions on Diesel combustion. This theoretical-experimental analysis is the basis for the development of a zero-dimensional Diesel combustion model. The objective of this first part is to analyze the physical variables and processes that control the central phase of the quasi-steady Diesel diffusion combustion. For that purpose a parameter as the apparent combustion time (ACT) characteristic of a diffusion combustion process has been used. This parameter allows to obtain explicit relations between on the one hand the injection rate law and in-cylinder conditions (air density oxygen concentration...) and on the other hand the rate of heat release. Results show a good correlation between the ACT and the instantaneous values of in-cylinder gas density injection velocity oxygen concentration and the nozzle diameter.