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<p>The present work studies the effect of injecting hydrogen (H<sub>2</sub>) gas at different flow rates in combination with algae biodiesel on the performance, combustion and emission of a stationary engine. To improve thermal efficiency and combustion behaviour while lowering emissions Hydrogen (H₂) was supplied through the intake manifold at flow rates of 20&#xa0;L min⁻¹, 22&#xa0;L min⁻¹ and 25&#xa0;L min⁻¹ with algae biodiesel (B25) given via the injector as the primary fuel. All the test results of the modified fuel combinations are compared with the results of diesel fuel. At full load B25 (20&#xa0;L min⁻¹) showed 2% higher BTE than diesel. In addition, H<sub>2</sub> enrichment lowered BSFC by approximately 24.24%. Combustion research found that for B25(20&#xa0;L min⁻¹) raised cylinder pressure by roughly 4.67% as compared to diesel. Similarly, the heat release rate (HRR) for B25(20&#xa0;L min⁻¹) increased by 24% compared to diesel and approximately by 31% compared to B25. Emission characteristics, including unburnt hydrocarbon (UBHC), oxides of nitrogen (NOx), carbon monoxide (CO), carbon dioxide (CO₂), oxygen (O<sub>2</sub>) and smoke, were measured under different engine loads. Regarding emissions, significant reduction in CO by (38%–50%), CO₂ by (3%–19%), UBHC by (14%–31%), O<sub>2</sub> reduced by (7.6%-10.11%) and smoke by (39%-49%) compared to diesel. While NOx emissions increased by (42%-60%) compared to diesel. Among the blends tested, the B25(20&#xa0;L min⁻¹) blend emerged as the most effective and promising alternative fuel, providing an ideal combination of engine performance, efficient combustion, and lower emissions.</p> Graphical Abstract <p></p>

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Performance and Emission Evaluation of a CRDI Diesel Engine Fueled with Algae Biodiesel and Hydrogen Enrichment

  • 期刊论文

  • 发表日期：

    2026年1月12日

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  • Debarup Borah,
  • Rahul Dev Misra

摘要

The present work studies the effect of injecting hydrogen (H2) gas at different flow rates in combination with algae biodiesel on the performance, combustion and emission of a stationary engine. To improve thermal efficiency and combustion behaviour while lowering emissions Hydrogen (H₂) was supplied through the intake manifold at flow rates of 20 L min⁻¹, 22 L min⁻¹ and 25 L min⁻¹ with algae biodiesel (B25) given via the injector as the primary fuel. All the test results of the modified fuel combinations are compared with the results of diesel fuel. At full load B25 (20 L min⁻¹) showed 2% higher BTE than diesel. In addition, H2 enrichment lowered BSFC by approximately 24.24%. Combustion research found that for B25(20 L min⁻¹) raised cylinder pressure by roughly 4.67% as compared to diesel. Similarly, the heat release rate (HRR) for B25(20 L min⁻¹) increased by 24% compared to diesel and approximately by 31% compared to B25. Emission characteristics, including unburnt hydrocarbon (UBHC), oxides of nitrogen (NOx), carbon monoxide (CO), carbon dioxide (CO₂), oxygen (O2) and smoke, were measured under different engine loads. Regarding emissions, significant reduction in CO by (38%–50%), CO₂ by (3%–19%), UBHC by (14%–31%), O2 reduced by (7.6%-10.11%) and smoke by (39%-49%) compared to diesel. While NOx emissions increased by (42%-60%) compared to diesel. Among the blends tested, the B25(20 L min⁻¹) blend emerged as the most effective and promising alternative fuel, providing an ideal combination of engine performance, efficient combustion, and lower emissions.

Graphical Abstract