Microemulsion fuels, cetane numbers

Ignition delays similar to those observed for the emulsion fuels may be experienced with microemulsion fuels as illustrated by Table I, which shows cetane numbers of microemulsion fuels determined on a CFR engine. 

The second and most promising approach is based on the fact that certain emulsifiers function by themselves as cetane number improvers. Observed cetane numbers of microemulsion fuels produced by this type... 

Figure 4, Cetane numbers of microemulsion fuels in which the emulsifiers act as cetane number improvers,...

The engine used was a one-cylinder direct-injection test engine at Saab-Scania, Sodertalje, Sweden. During the tests, maximum pressure, fuel consumption, exhaust temperature, CO, CO2, NO, NO2, O2, HC, and smoke were registered at varied injection timings, loads, and speeds. The performance of three microemulsion fuels was compared with a reference fuel of pure diesel oil with the cetane number of 43. The data of the microemulsion fuels are given in Table II. 

Figure 5. Relation between the relative NO emission and fuel consumption at various injection timings 28, 23, 18, and O 13 ""BTDC, The reference fuel ( ) is a diesel oil with cetane number 43. Fuel 1 (mmti), fuel 2 (irkif ) and fuel 3 (---) are microemulsion fuels with 10, 20, arid 30% water respec-...

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