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Effects of Compression Ratios on Combustion and Emission Characteristics of SI Engine Fueled with Hydrogen-Enriched Biogas Mixture

Author

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  • Quang Trung Nguyen

    (Faculty of Transportation Mechanical Engineering, The University of Danang-University of Science and Technology, 54 Nguyen Luong Bang, Da Nang 550000, Vietnam)

  • Minh Duc Le

    (Faculty of Transportation Mechanical Engineering, The University of Danang-University of Science and Technology, 54 Nguyen Luong Bang, Da Nang 550000, Vietnam)

Abstract

The effects of hydrogen-enriched biogas on combustion and emissions of a dual-fuel spark-ignition engine with different hydrogen concentration ratios were studied numerically. A 1-cylinder spark ignition was used to perform a numerical simulation. To reveal the influence of the compression ratios on combustion and emissions of a gaseous engine, the crankshaft of the engine was modified to generate different compression ratios of 8.5, 9.0, 9.4, 10.0, and 10.4. The biogas contained 60 and 40% methane (CH 4 ) and carbon dioxide (CO 2 ), respectively, while the hydrogen fractions used to enrich biogas were 10, 20, and 30% of the mixture by volume. The ignition timing is fixed at 350 CA°. The results indicate that the in-cylinder pressure, combustion temperature, and combustion burning speed increase gradually with increasing hydrogen concentration due to the combustion characteristics of hydrogen in blends. As increasing the compression ratio, NO x emissions increase proportionally, while CO 2 emissions decrease gradually. Almost no combustion process occurs as operating the compression ratio below 8.5 when using pure biogas. However, adding 20% of hydrogen fraction could improve the combustion process significantly even at a low compression ratio.

Suggested Citation

  • Quang Trung Nguyen & Minh Duc Le, 2022. "Effects of Compression Ratios on Combustion and Emission Characteristics of SI Engine Fueled with Hydrogen-Enriched Biogas Mixture," Energies, MDPI, vol. 15(16), pages 1-18, August.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:16:p:5975-:d:891115
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    References listed on IDEAS

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