Modelling of the fuel injection of medium speed marine diesel engines

Abstract

The article presents the stages of fuel injection modeling of the four-stroke marine diesel engines as a set of functional blocks the of the fuel waves flow. The elaborated model includes the values of changing pressures in the combustion chamber and the course of changes of the pressure in spaces of the injection pump, injection pipe and the injector. Linear and local losses, as well as the conditions for the functioning were taken into account in stages of the fuel flow. The influence of different values of the engine load on the pressure course of the in individual spaces of injection apparatus and in the engine cylinder during the working cycle depending on the crank angle of rotation of the crankshaft have been simulated. The mathematical relationships were selected and the structural and experimental data are used, allowing the calculation of the parameters of interest for the simulated process.

Optimization of Design and Technology of Injector Nozzles in Terms of Minimizing Energy Losses on Friction in Compression Ignition Engines

“…The pressure losses on the way from the injection pump drive to the injector nozzle were calculated for two engine types in [19,20]. The absolute pressure loss ∆ω in the spray hole depends on the type of nozzle hole, its constriction, the flow rate and the differential pressure.…”

“…The injection subsystem tests can be carried out on a real object in operation [5], on a real object in laboratory conditions [9,10] and with the use of computer simulation [19,20]. The essence of simulation studies of the fuel injection process is developing models that allow understanding the physical phenomena that determine the quality of injection.…”

“…Models at the evaluation stage, design and production of objects are created for the needs of inference in simulation or experimental studies [20,21]. The model does not reflect a real object but is only a reflection of the knowledge currently possessed, cannot be treated as something permanent and is not subject to change.…”

“…The purpose of modeling is to obtain a reliable mathematical model that allows tracing the behavior of an object under various conditions. When building a model, the laws of physics are mainly used, which express the balance of forces, moments, flows, continuity equations and geometric relationships, as well as the results of experimental research [20][21][22].…”