Abstract
High-power engines are in demand for marine propulsion use. Generally, though, an increase in rated power causes an increase in cylinder pressure. High cylinder pressure makes an engine more expensive because its structure has to be strengthened. We developed ASSIGN (Available Space Scattering Injection Geometric Nexus) Combustion to make possible both high power and low fuel consumption without cylinder pressure increase. One feature of ASSIGN Combustion is use of a staggered nozzle. As we use a staggered nozzle, however, interference between the main spray and sub spray, which is not a problem when a conventional nozzle is used, makes smoke emission worse. In this paper we describe the solution for this problem. We devised a staggered nozzle with a large number of small holes that improve the fuel atomization and mixture distribution in the cylinder.
