STUDY ON DELIVERY BEHAVIOUR OF SIMMS-FUEL PUMP WITH VARIABLE FREQUENCY DRIVE (VFD)

Abstract

This project uses a model simulation and analysis approach on a standalone mechanical fuel injection (MUI) system which detached from an engine located at Marine Workshop B20, UniKL MIMET. The subject of choice is a plunger-type reciprocating fuel pump that initially used a camshaft to deliver fuel to the engine and can be retrofitted onto light diesel internal combustion engines (ICE). As a simulation, the pump is connected to a single-phase AC motor 220 V rated at 1.8 kW via a coupling connection instead of a traditional engine. When the electric motor rotates, the shaft drives the fuel pump plunger reciprocally. This project intends to solve the problem of uneven fuel delivery. In these instances, the cause is the inconsistent rotation per minute (RPM) of the electric motors. The problem may be solved by adding a moderator, Variable Frequency Drive (VFD) electronic linked to the motor, which will regulate (limit) the current flow of specific frequency. SolidWorksTM software is extensively used to design the pump cylindrical chamber via a 3D modelling approach. The designed model is then simulated and analysed using ANSYS FluentTM software at different shaft driving speed RPM. The project aims to explore the relationship of driving speed variations RPM with the fuel pump discharge pressure, velocity stream and flowrate. From simulation, it is obtained that SIMMS-fuel pump capable to generate 4.08 MPa to 14.33 MPa and deliver 15.62 g/s to 29.22 g/s at 500 RPM to 3000 RPM respectively which concludes the increasing of driving speed RPM indeed cause increasing of discharge pressure and velocity of the fuel.