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

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. • Camelina sativa oil in a CI engine with H 2 can be a fully renewable energy source for the "H 2 green economy". • Premixed dual-fuel combustion (PDFC) enables high engine efficiency when fueled with Camelina sativa oil and hydrogen. • Camelina sativa co-burned with H 2 in a DF engine could mitigate challenges from hydrogen high combustion speed. • Combusting Camelina sativa oil with 42 % H 2 enables the engine to reach 82 % of the load achieved with diesel oil.