Marine Diesel Engine Transient Operation with Reduced Smoke Emissions

摘要

This paper presents the simulation of operation of a turbocharged medium-speed marine diesel engine, incorporating two prototype modifications to counteract fuel-air mismatch during transient loading - injection of high pressure air on the compressor impeller and variable path exhaust manifold allowing pulse or constant pressure turbocharging. The simulation work was performed using the MOTHER code, an in-house developed thermodynamic code, applied to the MAN B&W 5L16/24 test engine, installed in the Laboratory of Marine Engineering NTUA. For typical transient engine loading profiles, obtained from ship-board measurements, the simulation results clearly show the improved response of the turbocharger compressor. The simulation results were used in the design of related experiments, with the prototype components installed on a test engine.