Sisca: A Simulation Model of the Uniflow Scavenging Process of Two-Stroke Diesel Engines.
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.
KeywordsDiesel Engine Turbulent Kinetic Energy Internal Combustion Engine Turbulent Dissipation Exhaust Valve
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