Date of Publication :7th June 2025

Abstract: The transport and power generation industries are coming under more pressure to lower carbon emissions and fossil fuel dependency. Hydrogen, as a clean alternative fuel, offers near-zero carbon emissions and high combustion efficiency. This study investigates hydrogen’s application as a supplementary fuel in a 4-cylinder, 3.3 L turbocharged intercooled diesel genset engine operating at 1500 RPM. Simulations were performed using GT-SUITE under diesel-only and hydrogen-diesel dual-fuel modes. Two hydrogen supply strategies - Port Fuel Injection (PFI) and Direct Injection (DI) - were employed, with hydrogen substitution ranging from 10% to 50%. The simulations assessed thermal efficiency, fuel consumption, and emissions (NOx, CO, CO2, HC), maintaining constant power output. Results indicate notable improvements in thermal efficiency with dual-fueling. At 50% substitution and at 100% power, thermal efficiency increased from 41.79% to 41.84% in PFI mode, and 41.79% to 43.5% in DI mode. NOx emissions remained nearly constant through optimized injection timing and air-fuel ratio. The study concludes that hydrogen-diesel dual-fuel operation, particularly with direct injection, significantly enhances efficiency without increasing NOx emissions, offering a promising solution for cleaner and more efficient power generation.

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