A Modelling Technique of the Intake and Exhaust Systems of a Medium Speed Marine Diesel Engine

Researching through simulation software is a possible solution to evaluate the changes in engine performance. In order to create an effective engine simulation, it is critical to accurately calculate the properties at each component constituting the engine while spending the least amount of cost and time. This paper explains the modeling of the intake and exhaust systems for marine-use medium speed Diesel engines through the commercial software, BOOST. In doing so. this paper compares three different methods of formulating the model. The first method involves reflecting the shape and dimension of the complex configuration's intake and exhaust systems to a nearly identical level. The second method involves using an approximation. while the third method regards a part of the complicated pipe system as a large volume like a tank. In testing the modeling of the intake and exhaust systems. the Wiebe function and the ROHR model have been applied to the combustion model. After comparing the estimation and experimental values of time-average properties for the major points, the first method proved to provide results most proximate to the experimental value. However, considering the time and money spent on deriving an estimation, the third method is also deemed recommendable.