Performance and Emission Characteristics of Hydrogen-Enriched Internal Combustion Engine Systems

Abstract

The increasing demand for sustainable and low-emission energy solutions has accelerated the exploration of alternative fuels for internal combustion engine systems. Conventional fossil fuel–based engines contribute significantly to greenhouse gas emissions, air pollution, and energy inefficiencies, creating the need for cleaner and more efficient combustion technologies. This research investigates the performance and emission characteristics of hydrogen-enriched internal combustion engine systems to evaluate their potential for improving engine efficiency and reducing harmful exhaust emissions. The proposed study examines the integration of hydrogen fuel with conventional hydrocarbon fuels in spark ignition and compression ignition engine configurations under varying operating conditions. Experimental analysis is conducted to evaluate the influence of hydrogen enrichment on combustion behavior, thermal efficiency, fuel consumption, ignition characteristics, and engine power output. The study further investigates exhaust emission parameters including carbon monoxide, hydrocarbons, nitrogen oxides, carbon dioxide, and particulate matter under different engine loads and hydrogen blending ratios. Advanced combustion analysis and thermodynamic evaluation techniques are employed to assess flame propagation characteristics, combustion stability, and heat release behavior within the engine cylinder. Performance assessment is conducted using parameters such as brake thermal efficiency, specific fuel consumption, combustion efficiency, emission reduction capability, and engine stability. Experimental results demonstrate that hydrogen enrichment significantly improves combustion efficiency, enhances thermal performance, and reduces carbon-based emissions compared with conventional fuel operation.