Effects of dual fuel combustion on performance, emission and energy-exergy characteristics of diesel engine fuelled with diesel-isobutanol and biodiesel-isobutanol

This experimental study investigates the effects of dual fuel combustion (DFC) of isobutanol on performance, emission, and energy-exergy characteristics of an off-road diesel engine using diesel and waste cooking oil biodiesel. The isobutanol is port injected at the premixed energy ratio (PER) of 10, 20, and 30% with intake air, while diesel, B20, and B100 are the direct in-cylinder injected fuels. The experiments indicated an improved brake thermal efficiency in DFC of diesel and B20 (1.22 and 5.27%) than their conventional combustion mode (CCM) at rated loads. The carbon monoxide emission from DFC is reduced than CCM at rated loads except B100. The DFC reduced the nitrogen-oxides (NOx) emission than CCM up to intermediate loads (60%). Compared to CCM, smoke emission at the rated load is lowered by 10.15%, 22.12%, and 7.40% in the DFC of diesel, B20, and B100 respectively at 30% PER. At 30% PER, the exergy efficiency of DFC of B20 is increased by 0.91, 5.23, 3.65, 1.22, and 6.14% from 20% to 100% loads compared to its CCM. Overall, the DFC of B20-isobutanol with 30% PER is observed to be a better choice in terms of improved performance, NOx and smoke emissions, and exergy efficiency. (c) 2022 Elsevier Ltd. All rights reserved.

Automated summary

This experimental study investigates the effects of dual fuel combustion of isobutanol on the performance, emission, and energy-exergy characteristics of an off-road diesel engine. The results show that the dual fuel combustion of isobutanol can improve the thermal efficiency and reduce the emissions of carbon monoxide and nitrogen oxides. Additionally, at a certain premixed energy ratio, the dual fuel combustion of B20 isobutanol has a positive effect on improving the energy-exergy efficiency.