Experimental evaluation of hydrogen enrichment in a dual-fueled CRDI diesel engine

The influence of hydrogen enrichment on the dieselengine fueled with diesel and palm biodiesel blend (P20) is investigated in this study. The hydrogen is injected into the intake manifold at different flow rates of 7 lpm and 10 lpm for each loading condition of 30%, 60%, 80%, 90%, and 100%, respectively. Hydrogen enrichment improves the BTE and BSEC due to its high calorific value and decreases emissions like HC, CO, and CO2 due to its carbon-free structure. However, due to a rise in EGT, NOx emission has increased. With the addition of hydrogen, combustion properties such as in-cylinder pressure (ICP), heat release rate (HRR), and ignition delay (ID) improve while the combustion duration (CD) drops. Compared to P20 fuel,P20 + 10H(2) has a 28% increase in BTE and a 20% decrease in BSEC at 90% load. Similarly, HC, CO, and CO2 emissions decrease by 16%, 35%, and 12%, while NOx emission increases by 13% compared to P20. At full load, P20 + 10H(2)increasesin-cylinder pressureand heat release ratebyupto 1-5%, while CD decreases by 12.5% compared to the P20 blend. (c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.