In the present study, a comparative analysis of enrichment of hydrogen alongside diesel fuel and two different sources of biodiesel namely rice bran oil is an edible oil, and karanja oil being non-edible is tested. Hydrogen at a fixed flow rate of 7 lpm is inducted through the intake manifold. A total of six fuel samples are considered: diesel (D), hydrogen-enriched diesel (D + H-2), hydrogen-enriched 10, and 20% rice bran biodiesel blend (RB10 + H-2 and RB20 + H-2), and hydrogen-enriched 10 and 20% karanja biodiesel blend (KB10 + H-2 and KB20 + H-2). Results indicate that enrichment of hydrogen improves combustion and results in 2.5% and 1.6% increase in the brake thermal efficiency of diesel fuel and rice bran biodiesel, respectively. For karanja biodiesel the increment is negligible. Fuel consumption of the D + H-2 is 6.35% lower and for RB10 + H2 and KB10 + H-2 it is decreased by 2.9% and 1.3%, respectively. The Presence of hydrogen shows the 4-38% lower CO emissions and 6-14% lower UHC emission due to better combustion. The blends RB10 + H-2 and KB10 + H-2 produce up to 6-13% higher NOx emission and that for the blends RB20 + H-2 and KB20 + H-2 it goes up to 25%. Overall rice bran oil is found to provide better performance than karanja biodiesel. (c) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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