Sisca: A Simulation Model of the Uniflow Scavenging Process of Two-Stroke Diesel Engines.

Abstract

In order to optimize the scavenging process of two-stroke uniflow scavenged diesel engines, a simulation model of this process has been developed. With the aid of finite difference techniques (PHOENICS), it is possible to solve the elementary equations of fluid flow (e.g. Navier-Stokes equations). When boundary and initial conditions are known a fluid flow problem such as scavenging of two-stroke engines, can be simulated and the local properties of fluid flow in the engine cylinder can be predicted. This is quite different from earlier used single- and multi-zone models of mathematical description of the scavenging process.

This model is used for two engines : BOLNES 190/600 and 1Q2 a research engine of Delft University of Technology (D.U.T).

In principle the model can be used for analyzing or development of the scavenging process of uniflow scavenged two-stroke engines.

With this model it is possible to investigate the influence of geometrical modification on scavenging efficiency. Furthermore swirl-ratio and temperature at the start of the compression stroke can be predicted.

This project is carried out in a collaboration of Bolnes Motorenfabriek B.V. and the laboratory for Internal Combustion Engines at D.U.T with input and advice given by the Research Institute for Road Vehicles TNO at Delft.