PREDICTION OF CYLINDER FLOW FIELD MODIFICATION DUE TO SQUISH IN D I DIESEL ENGINE

Abstract

The f low field in reciprocating internal combustion engines, more so diesel engines, is three dimensional and turbulent. During the last decade, experimental and theoretical studies on iricylinder air motion have seen considerable progress due to the development of LASER techniques and the increase in computing power. A number of publications have appeared, in recent past, discussing the development of multidimensional models for calculating the flow, heat transfer, spray mixing and combustion within engine cylinders. Of these, the air motion and interaction with spray have been the two important aspects widely investigated. In this work, a mathematical model is described for the computation of iricylinder flow structure of a diesel engine prior to combustion considering steady, adiabatic, nonreactive, inviscid and axisymmetric compressible flow. The solution technique used in the computation of velocity vectors inside the engine cylinder is based on the Finite Element Method (FEM) numerical approach.