Numerical investigation on spray, combustion and emission characteristics of marine engine for polyol solution-heavy fuel oil blend fuels

HFO is the fuel that marine engines utilize the most frequently due to its cost-effectiveness and high energy density, but it releases many harmful pollutant emissions. With increasingly stringent regulations for marine vessels, exploring fuel optimization method for HFO to reduce pollutant emissions is essential. This study concerned the exploration of spray, combustion and emission characteristics of different polyol (ethylene glycol, glycerol, glucose) solution-HFO blends. Both CVCC spray model and marine engine combustion model were established and validated. This research indicated that introduce polyol resulted in increased evaporation mass and SPL, and reduced SMD for HFO. Polyol solution-HFO blends exhibited lower cylinder pressure, cylinder temperature and HRR compared with HFO yet were higher compared to W-HFO. In addition, polyol solution-HFO blends reduced NOX emissions, but increased HC and soot emissions compared to HFO. Conversely, increased NOx emissions and decreased HC and soot emissions for polyol solution-HFO blends compared to W-HFO. At 100 % load, NOX emissions of polyol solution-HFO blends were reduced by 1.89%-56.58 % compared with HFO, and the HC emissions and soot emissions decreased by 6.55%-50.61 % and 17.63%-60.16 % respectively, compared to W-HFO.