Numerical modelling of Diesel spray combustion

This work presents the development and implementation of a spray combustion model based on the spray size distribution moments approach to spray modelling. The governing equations for both the gas and liquid phases are solved by the finite volume method based on an Eulerian framework. The models employed in the auto-ignition and combustion analysis is the PDF-Eddy Break-Up model. This scheme is developed in order to effectively validate both ignition and combustion phases. It is designed to compromise between the chemical reaction rate dealing with the auto-ignition mode, and the turbulence reaction rate dominating the combustion mode via a reaction progress variable which represents the reaction level. These average reaction rate source terms in species transport equations are evaluated by a probability density function (pdf) averaging approach. This ignition and combustion model developed here is shown to have a high potential as a numerical tool for predicting the phenomena of spray combustion in diesel engines.