Accuracy Improvement of Diesel Combustion Simulator UniDES (Second Report)

- A Proposal of Spray-to-spray Interaction Model for Multiple Fuel Injections -

Abstract

A novel 0-dimensional engine simulator called UniDES has been developed through a series of studies. In actual cases of multiple-injection, prior sprays can affect the ignition and combustion characteristics of following sprays. This study used a new spray-to-spray interaction model to estimate the burned gas rate with respect to the total gas entrained in a following spray. This model also considers spray deflection due to swirl flow and wall impingement. It was confirmed that the new model is capable of reproducing spray interaction behavior, as well as accurately predicting heat release rates and exhaust gas conditions such as temperature and HC concentration.