Performance and emission studies in a heavy-duty diesel engine fueled with n-butanol and n-heptane blend 2019-01-0575
N-butanol, as a biomass-based renewable fuel, has many superior fuel properties. It has a higher energy content and a higher cetane number than its alcohol competitors, methanol and ethanol. Previous studies have proved that n-butanol has the capability to achieve lower emissions without sacrifice on thermal efficiency when blended with diesel. (2017-01-0760) However, most studies on n-butanol are limited to low blending ratios, which restricts the improvement of emissions. In this paper, 80% by volume of n-butanol was blended with 20% by volume of n-heptane (namely BH80) and various engine parameters (EGR ratios, injection timings, intake pressures) on its combustion and emission characteristics are tested under different loads, 8, 12, 16 bar gross indicated mean effective pressure (IMEPg), respectively. The results showed that higher intake pressure promotes stable combustion of BH80 at 8 bar IMEPg. Meanwhile, it was found that for a constant lambda (1.55) the stable operating load range of BH80 is limited to relatively high load (>8 bar IMEPg). In addition, BH80 has the ability to produce very low soot emissions at all test conditions.