Comparative study of diesel and diesel-hydrogen dual fuel use in RCCI engine under various load conditions

Abstract

The aim of this study to investigate the effects of using hydrogen and diesel fuels on combustion characteristics and emissions in a Reactively Controlled Compression Ignition (RCCI) engine. RCCI technology optimizes the combustion process by exploiting the differences in reactivity of the two different fuels. This improves engine performance and reduces emissions. The study will examine the potential benefits of using alternative fuels such as hydrogen in combination with diesel fuel in RCCI engines with the aid of CFD analysis. The main reason for studying hydrogen is that hydrogen has the most research in the literature and it has a wide flammability range, high flame speed, high diffusivity, zero carbon, sulphur content. Replacing part of the diesel fuel reduces the total carbon content and HC emissions in RCCI mode, while increased engine load increases HC and NOx emissions. A low engine load may be more advantageous for H2-diesel RCCI combustion, as HC emissions are reduced more than a slight increase in NOx emissions. The study reveals that diesel-hydrogen dual fuel systems can be an environmentally friendly alternative to diesel engines if supported by appropriate engine control strategies and emission control technologies. The results highlight the need for further research and optimization in energy efficiency and emission management.