Parametric investigation the particle number and mass distributions characteristics in a diesel/natural gas dual-fuel engine

The experimental results indicated that the particle number and mass are significantly influenced by the pilot injection pressure, brake mean effective pressure and percentage energy substitution, but the particle size distribution is not sensitive to the variation of those parameters. Furthermore, the particle number concentration (in particular to the ultrafine particle) could be reduced dramatically with increased pilot injection pressure and the percentage energy substitution as well as engine loads. In addition, over 60% number of particle emitted from a diesel/natural gas dual-fuel engine is ultrafine particle while they just provide no more than 10% particle mass.