Effect of manifold injection of n-decanol on neem biodiesel fuelled CI engine

This research aims to achieve low temperature combustion by premixing n-decanol with the air in the intake manifold in a diesel engine along with biodiesel as a primary fuel. In this experiment, neem oil methyl ester has been utilised as a primary fuel through the main injector in the volumetric ratio of 80% diesel and 20% biodiesel namely NB20 along with the manifold injection of n-decanol through a secondary injector at various concentrations such as 10%, 20%, and 30%. It is observed from the experiment that the 30% n-decanol injection produced a brake thermal efficiency of 34.5%, which was comparable to diesel fuel due to its better combustion, as evidenced by a higher heat release rate. Oxides of nitrogen and smoke were reduced simultaneously for biodiesel-n-decanol combinations due to their LTC and the maximum reduction was found for a 30% injection rate of n-decanol. It was about 11.80% for NOX, 9.57% for smoke compared to NB20. It is clearly seen that the 30% injection rate of n-decanol produced lower emissions and better performance than 10% and 20% injection rate of n-decanol. This research suggests that the NB20-n-decanol combinations in premixed combustion mode can be an attractive replacement for diesel fuel. (C) 2021 Elsevier Ltd. All rights reserved.

Automated summary

This research investigates low temperature combustion in a diesel engine through premixing n-decanol and biodiesel as the main fuel, achieving better thermal efficiency and reduced emissions, with a particular focus on the 30% n-decanol injection rate.