Abstract:
Abstract: Reactivity-Controlled Compression Ignition(RCCI) is widely expected as a promising dual fuel low-temperature combustion (LTC) strategy in recent engines. The potential strategy can control the in-cylinder fuel reactivity for the low NO and Particulate Matter (PM) emissions with high thermal efficiency. This study aims to investigate the effects of methanol fraction and excess air coefficient on the non-regulated emissions of diesel engines in RCCI mode under different operating conditions. A bench test was performed on a modified 4-cylinder high-pressure common-rail diesel engine under RCCI combustion. The results showed that the total hydrocarbon emissions increased sharply with the rise of methanol substitution rate, while decreased with the increase of load at 2000 r/min. The unburned methanol accounted for about 90% of total hydrocarbons (THC) emissions under the methanol/diesel dual fuel. The emissions of methanol, formaldehyde (HCHO), aromatic hydrocarbons (AHC), and sulfur dioxide (SO2) increased, whereas, the emissions of non-methane hydrocarbons (NMHC) and carbon dioxide (CO2) decreased, as the methanol substitution rate increased. The CO2 emission reduced by 4.5% as the methanol substitution rate increased from 0% to 15% at 25% load, while dropped by 6.8% in the methanol proportion from 0% to 30% at 100% load. The emissions of unburned methanol, formaldehyde, NMHC and SO2 decreased, while the CO2 emission increased at different load rates with the decrease of excess air coefficient. Under 25% load, the emission of unburned methanol decreased by 16.9%, 12.7%, and 14.5%,while the emissions of formaldehyde reduced by 8.8%, 10.8%, and 10.5%, and the NMHC emissions reduced by 66.7% and 83.3% with 5%, 10% and 15% methanol substitution rate, as the excess air coefficient was reduced from 3.48 to 3.05.Under 100% load condition, the methanol emissions reduced by 45.6%, 45.9%, and 43.9%, and the formaldehyde emissions decreased by 36.5% and 33.3%, while the NMHC emissions dropped by 18.2%, 27.3%, and 60% with 10%, 20%, and 30% methanol, as the excess air coefficient decreased from 1.6 to 1.38. The emission of aromatic hydrocarbons rose with the decrease of excess air coefficient at high load, but the change was not obvious at low load conditions. Therefore, the relatively low excess air coefficient was beneficial to reducing the non-regulated emissions, where the valve opening was used to properly control the in-cylinder fuel reactivity during RCCI mode. The findings can provide a potential theoretical basis to balance the methanol/diesel dual-fuel RCCI combustion and pollutant emissions.