Abstract:
This work investigates the influence of fuel injection events on the nanoparticle emission characteristics of light-duty gasoline-diesel RCCI engine. The formation of nanoparticle emissions strongly
depends on fuel injection events. The present study experimentally investigates the influence of
diesel injection pressure, injection timing, and port-injected gasoline mass on the nanoparticles
emitted from the gasoline-diesel RCCI engine. For this purpose, the engine is tested at different
engine speeds and a fixed load of 1.5 bar BMEP without exhaust gas recirculation. The particle-size
and number distribution (PSD) and total particle number (total PN) concentration are measured
using a differential mobility spectrometer. The results depict that at higher diesel injection pressure (IP) operation, the peak of the NMP increases while the AMP peak decreases for neat diesel
operation as well as RCCI engine. Nucleation, as well as accumulation mode particles, increases
with advanced diesel injection timing in RCCI combustion. An increase in port fuel injected mass
also leads to an increase in the total particle concentration and total unburned hydrocarbon
(THC) emissions
