A Novel Diesel Injection Nozzle for Future HCCI Engines

Aiming to further improve Diesel engine fuel efficiency and exhaust emissions, we conducted evaluation of a newly devised Diesel Injection Shear-Stress Advanced Nozzle (DISSAN) where two jets were formed separately and then interacted into the nozzle exit. Transmission and Schlieren photography and phase-Doppler anemometry were used to quantify transient spray and evaporation dynamics. The nozzle produces a homogeneous fuel spray with wider cone patterns up to 68° and finer droplet sizes less than 22 microns. The concentration of fuel droplets is a few orders of magnitude lower vs. conventional Diesel sprays. These spray patterns result in higher mixing /evaporation rates.