Experimental Study on Combustion and Emission Characteristics of Ethylene Glycol Diesel Dual-Fuel Engine

Ethylene glycol (EG) has been proven to be a potential alternative energy due to its high intramolecular oxygen content and thermal conductivity. The impacts of ethylene glycol on combustion and emission characteristics of diesel engines are investigated at high ethylene glycol injection pressure (EGP). EG energy ratio (EGER) is set as EG0, EG5, EG10, EG15, EG20, and EG25 respectively). The results show that the peak cylinder pressure, the peak heat release rates (HRRs), and pressure rise rate first decrease and then increase with the increase of EGER at low load. However, the effect is not obvious at high load. Ignition delay is prolonged with the increase of EGP at all loads. Combustion duration decreases with the rise of EGP at 0.42 MPa and 0.70 MPa BMEP, EGP has little effect on the combustion duration at 0.92 MPa BMEP. In consideration of emission, NOx emission decreases with the rise of EGER, while the number concentration of ultrafine particles (UFPs) increases. The NOx emission is more obviously affected by EG than that of UFPs. In conclusion, EG is expected to optimize the performance and emissions of dual-fuel diesel engines.