Experimental assessment reveals hydrogen's role improves combustion and emission in CI engines, indicating viable fuel alternatives.
The objective of this research is to evaluate the inter-dependence effect of hydrogen on biodiesel produced from watermelon seed oil (WMSOB) on the combustion, emission and performance parameters of the CI engine. The experiment has been carried out on single cylinder, four-stroke compression ignition engine with eddy-current dynamometer at injection timing of 23o before top dead center (TDC) and 180 bar injection pressure. The watermelon seed oil biodiesel (WMSOB20) blend was injected as a main fuel through the injector and hydrogen with different flow rates (3, 6 and 9 liters/min) through the air intake manifold without any modification. The outcome showcased that the underlying characteristics of CI engine are effectively improved with a minor increase in NOx emissions. Diesel-watermelon biodiesel blend with 6 LPM hydrogen supplementation was found to have a positive impact on the Brake thermal efficiency by up to 8.57% and 4.32% reduction in Brake specific fuel consumption. Induction of H2 significantly reduced the formation of UBHC and CO with a marginal escalation in NOx. The operational cost analysis attributed the inductance of Hydrogen to be satisfactory on the overall performance. Hence WMSOB20+ H2 6 LPM blend is the most appropriate substitute fuel for the unmodified CI engines. KEY WORDS: Hydrogen enrichment, Combustion, Operational cost, Emission, Watermelon seed biodiesel Bull. Chem. Soc. Ethiop. 2025, 39(9), 1859-1876. DOI: https://dx.doi.org/10.4314/bcse.v39i9.15
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Kumar et al. (2025) studied this question.
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