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

The effects of hydrogen-enriched biogas on combustion and emissions a dual-fuel spark-ignition engine with different hydrogen concentration ratios were studied numerically. A 1-cylinder spark ignition was used to perform numerical simulation. To reveal the influence compression gaseous engine, crankshaft modified generate 8.5, 9.0, 9.4, 10.0, 10.4. contained 60 40% methane (CH4) carbon dioxide (CO2), respectively, while fractions enrich 10, 20, 30% mixture by volume. timing is fixed at 350 CA°. results indicate that in-cylinder pressure, temperature, burning speed increase gradually increasing due characteristics in blends. As ratio, NOx proportionally, CO2 decrease gradually. Almost no process occurs as operating ratio below 8.5 when using pure biogas. However, adding 20% fraction could improve significantly even low ratio.