Experimental analysis of in-cylinder combustion characteristics and exhaust gas emissions of gasoline–natural gas dual-fuel combinations in a SI engine.

Sarabi, Mehrdad; Abdi Aghdam, Ebrahim

The separate use of gasoline or natural gas (NG) in engines has some advantages and disadvantages, which make it difficult to choose one over the other. It seems that using a combination of these two can compensate for the disadvantages. In the current study, four different gasoline–NG combinations including 100%, 90%, 75% and 60% gasoline and the rest NG (G100, G90, G75 and G60) were analyzed. Using these combinations in a single-cylinder SI research engine, the in-cylinder pressure of successive cycles and exhaust gas emissions were measured at different ignition timings. Optimum ignition timing of each combination was determined at the engine speed of 1800 rpm, the compression ratio of 10 and the stoichiometric equivalence ratio. The results indicated that the increase in NG fraction in the combination leads to a significant decrease in imep coefficient of variation. The analysis of mass fraction burned demonstrated that with the increase in NG fraction in the combination, the flame development angle of the fast cycles increases (except in G75). In G75, the range of variation period of flame development angle from fast cycles to slow cycles was observed to be the highest, while that of the rapid burn angle was the lowest. Reducing the gasoline percentage in the combinations decreased the amount of CO2 and NOx emissions (except NOx in G60). CO emission also increased with the decrease in gasoline fraction until G75, but reduced to less than that of G100 in G60.

SPARK ignition engines; WASTE gases; NATURAL gas; GASOLINE; COMBUSTION; DUAL-fuel engines

Journal of Thermal Analysis & Calorimetry, 2020, Vol 139, Issue 5, p3165

1388-6150

Academic Journal

10.1007/s10973-019-08727-2