Paradigm analysis of performance and exhaust emissions in CRDI engine powered with hydrogen and Hydrogen/CNG fuels: A green fuel approach under different injection strategies.

An engine with common-rail direct injection diesel uses Hydrogen and hydrogen-enriched CNG to investigate their possible usage. The engine's air intake manifold delivers hydrogen/CNG and hydrogen mixes. Different injection pressures (three) and at higher load are used to test out the different engine output parameters. In dual and single-fuel operations with diesel, dual-fuel operations produce higher in-cylinder pressure (73.39 bar) and shown better combustion. Due to induction of dual fuel, there is large variability in ignition delay and combustion duration compared to pure diesel. Enriching hydrogen reduces specific fuel usage. Significant reduction in engine pollutants is observed in dual fuel mode compared to diesel fuel. Hydrogen substitutes reduce THC and CO 2 emissions by 30–35% and 3–4% respectively. Dual-fuel operations emit less smoke (5–10%) in different injection pressure than diesel. At all injection pressure the different combustion parameters, performances (37.2% better than D100) and emissions like NOx, CO 2 , and smoke are better for all dual-fuel than diesel at rated load for the different fuel approach type two (DFA2). • In a CRDI engine, hydrogen and CNG mixtures are tested better performance and to control emissions. • At the rated load with three different injection pressures, the ignition delay for operations using dual-fuel is reduced. • For all the injection pressure combustion duration is better for DFA1, DFA2, and DFA3 than conventional diesel. • Enriching hydrogen results in lower emissions of THC, CO2, and other green-house gases. • Change in injection pressure significantly reduces emissions of smoke, CO2, and NOx, in vehicles with dual-fuel. [ABSTRACT FROM AUTHOR]