Simulation Study on the Effects of Hydrogen-Rich Gas Addition on the Performance and Emissions of Diesel Engines for Nearshore Fishing Vessels
Year: 2025
Type: article
Abstract: This study investigates the influence of HHO gas enrichment on the combustion and emission characteristics of a diesel engine operating at 2200 rpm under various load conditions. Experimental measurements and AVL Boost simulations were conducted to evaluate the effects of hydrogen addition on in-cylinder pressure, air–fuel ratio, and key emission parameters. The results show that HHO, owing to its high flame speed, carbon-free composition, and additional oxygen content, significantly improves combustion quality and engine efficiency. Brake-specific fuel consumption decreased by 7–10% at medium loads, while CO and soot emissions were reduced by 20–35% and 30–40%, respectively, indicating more complete and cleaner combustion. However, NOx emissions increased slightly by about 10–15% at higher loads due to elevated peak temperatures. The air–fuel equivalence ratio (λ) decreased with increasing HHO proportion but remained above 1.2, ensuring stable operation. Overall, HHO enrichment proves to be a feasible and effective approach to enhancing the thermal efficiency and environmental performance of diesel engines, particularly by reducing soot and CO emissions while maintaining stable combustion behavior.
Authors: Trinh Xuan Phong, Nguyen Trung Kien, Ngo Manh Ha
Language: English
Subfield: Fluid Flow and Transfer Processes
Field: Chemical Engineering
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W7088211013
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