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<p>The transportation industry grapples with dwindling fossil fuels and escalating environmental concerns. To address this, research has highlighted the potential of hydrogen gas as an alternative to pure diesel and biodiesel. Hydrogen can improve combustion efficiency and reduce engine vibrations, leading to smoother operation. However, testing has primarily focused on stationary engines due to readily available hydrogen cylinders and limited in-situ production methods.The present study explores a novel approach, utilizing a hydrogen reactor fueled by NaBH<sub>4</sub> and Al<sub>2</sub>(SO4)<sub>3</sub> to directly generate hydrogen for a VCR diesel engine. This integration allows the engine to operate in a dual-fuel mode. Extensive testing was conducted with varying loads (0–12&#xa0;kg) and hydrogen flow rates (0, 5, 10, and 15 lpm) into the engine manifold using a hydrogen reactor and flow meter.The results demonstrate that blending hydrogen with diesel enhances combustion and reduces vibrations in the modified engine. Compared to pure diesel, the 15 lpm hydrogen flow rate shows particularly promising results. Cylinder pressure and pressure rise rate increase by 5.47% and 10%, respectively, while vibrations decrease by 11.99%. These findings suggest that hydrogen-diesel dual-fuel operation offers significant potential for improving engine performance and reducing environmental impact.</p>

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An Experimental Study on Combustion and Vibration Characteristics of Dual-Fuel VCR Diesel Engine Integrated with Hydrogen Reactor

  • 期刊论文

  • 发表日期：

    2025年7月26日

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  • Shaik Subani,
  • D. Vinay Kumar,
  • T. CH. Anil Kumar,
  • Shaik Farooq

摘要

The transportation industry grapples with dwindling fossil fuels and escalating environmental concerns. To address this, research has highlighted the potential of hydrogen gas as an alternative to pure diesel and biodiesel. Hydrogen can improve combustion efficiency and reduce engine vibrations, leading to smoother operation. However, testing has primarily focused on stationary engines due to readily available hydrogen cylinders and limited in-situ production methods.The present study explores a novel approach, utilizing a hydrogen reactor fueled by NaBH4 and Al2(SO4)3 to directly generate hydrogen for a VCR diesel engine. This integration allows the engine to operate in a dual-fuel mode. Extensive testing was conducted with varying loads (0–12 kg) and hydrogen flow rates (0, 5, 10, and 15 lpm) into the engine manifold using a hydrogen reactor and flow meter.The results demonstrate that blending hydrogen with diesel enhances combustion and reduces vibrations in the modified engine. Compared to pure diesel, the 15 lpm hydrogen flow rate shows particularly promising results. Cylinder pressure and pressure rise rate increase by 5.47% and 10%, respectively, while vibrations decrease by 11.99%. These findings suggest that hydrogen-diesel dual-fuel operation offers significant potential for improving engine performance and reducing environmental impact.