The impact of hydrogen on the combustion of Camelina Sativa Oil in dual-fuel CI engine

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Integrating hydrogen as a supplementary fuel with vegetable oils in CI engines is a promising pathway toward sustainable energy solutions, but it remains scarce. The paper describes premixed dual-fuel combustion (PDFC) of Camelina sativa oil and hydrogen with substitution rates of up to E H2 = 50 % in AVL 5402 CI engine equipped with a common-rail. The tests were conducted at various load conditions at n = 1500 rpm. The results demonstrated that hydrogen significantly alters the combustion process by reducing the dual-fuel mixture's ignition delay and positively influencing the engine's overall efficiency (η o = 40 %). Furthermore, the study revealed that hydrogen co-burned with CS reduces THC, CO, and PM emissions, but there is a need for NO x reduction. The study provides quantitative insights into dual-fuel combustion (including a comparison of CS and diesel oil co-burned with hydrogen), enriching the understanding of hydrogen utilisation in IC engines.