Modelling of direct injection diesel engine combustion and emissions-An easy and reliable method

Abstract

<span style="font-size:11.0pt;line-height: 115%;font-family:" calibri","sans-serif";mso-fareast-font-family:"times="" new="" roman";="" mso-ansi-language:en-in;mso-fareast-language:en-us;mso-bidi-language:ar-sa"="" lang="EN-IN">odelling of combustion and emission phenomenon in diesel engines is on the cross roads. Because of the availability of super computers, highly sophisticated multi-dimensional models are being developed making global thermodynamic models obsolete. However, multi-dimensional models are quite expensive from the point of view of memory and computer time, whereas simple thermodynamic models lack accuracy. In this paper, a via media approach between the global and multi-dimensional models is attempted. The model employs a two-zone approach dividing the combustion chamber into burning and non-burning zones. The burning zone is identified by the spray characteristics and air entrainment. Formulation and solution of energy and mass conservation equations in the spray zone and the rest of the cylinder results in the determination of burning zone, non-burning zone and the average cylinder gas temperatures. This helps in the prediction of thermal efficiency and most importantly the emission characteristics.</span>