Comparative particulate characteristics of hydrogen, CNG, HCNG, gasoline and diesel fueled engines

Abstract The present experimental investigations have been carried out to compare particulate emission characteristics of mineral diesel, gasoline, CNG, HCNG and hydrogen fueled engines. Experiments were performed in two identical constant speed engines, which were suitably modified to adapt to specific fuel properties (SI and CI engines). For each test fuel, particle number-size distributions, surface area-size distribution and mass-size distributions were determined at five engine loads ranging from no load to full load. These distributions are helpful in assessment of possible toxicity and atmospheric retention time of these toxic particulate. No visible tail-pipe particle emissions were observed from gasoline, CNG, HCNG and hydrogen. However, particulate number concentrations from these test fuels were significant compared to baseline mineral diesel, particularly for the nucleation mode (D p p p