Prediction of the In-cylinder Flow and Heat Transfer in Direct Injection Diesel Engine : 1st Report, Calculation Procedure

Abstract

This paper presents a method for predicting the local flow, heat transfer and wall temperature in the cylinder of a direct injection diesel engine. A multi-dimensional model, using the conventional k-εturbulence model, was employed for the prediction of in-cylinder phenomena. The model used a finite difference procedure with an expanding /contracting grid in axisymmetric representation. Fuel injection, accommodated by an empirical formula of the spray, was considered. Combustion was treated, adopting an experimental data of heat release rate. The temperature distributions of the walls were calculated by another model of thermal analysis, using a finite element method, for the head, cylinder and piston. Both models were coupled by boundary conditions namely wall functions. This method can be utilized to estimate heat transfer performance and to investigate thermal effects of hardware design.