Suppression of Mutual Fuel Spray Interactions and Improvement of Diesel Combustion by a Fuel Injector with Staggered Nozzle Hole Arrangement

Abstract

An injector with staggered nozzle hole arrangement is proposed to improve diesel combustion with suppression of interactions among fuel sprays. The injector has twelve spray holes, staggered on two injection angles of 79º and 55º from the central axis. The improvements in thermal efficiencies and the smoke reduction can be established with the staggered nozzle. The rate of heat release from the staggered nozzle has more active main combustion and smaller afterburning. The CFD simulations showed that the staggered nozzle can efficiently suppress the interactions among fuel sprays at the combustion chamber wall, resulting in reductions in the afterburning.