Abstract This study explores the potential of hydrogen-enriched compressed natural gas (HCNG) blends as a high-efficiency and sustainable fuel for spark ignition (SI) engines. HCNG, a mixture of compressed natural gas (CNG) and hydrogen, offers a promising alternative to conventional fuels by enhancing combustion characteristics and reducing emissions. The research investigates the performance and emission characteristics of HCNG blends containing 10% and 15% hydrogen by volume, comparing them with pure CNG and gasoline. Experimental results show that the 15% HCNG blend increases engine torque by 6.25%, reaching a peak of 34.4 N·m, while brake thermal efficiency improves by 13.8%. The high flame speed of hydrogen contributes to faster and more complete combustion, leading to a 12.1% reduction in brake-specific energy consumption (BSEC). Emission analysis reveals significant reductions in hydrocarbon (HC) and CO2 emissions, decreasing by 40.6% and 32%, respectively, for the 15% HCNG blend. However, NOx emissions increase by 10.1% due to higher combustion temperatures. This study provides a comprehensive evaluation of HCNG as an alternative fuel, addressing gaps in existing literature by presenting detailed experimental findings. The results highlight HCNG's potential to enhance internal combustion engine efficiency while supporting cleaner energy solutions. These insights contribute to ongoing research on alternative fuels, helping advance sustainable transportation technologies.
Anand et al. (Fri,) studied this question.
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