Laminar flame speed prediction for Natural Gas/hydrogenIn recent years, air quality has become a severe problem in many countries. The use of natural gas as an alternative fuel has been growing in recent years, since it is a promising alternative fuel to meet strict engine emission regulation. Natural gas has the potential to provide a good compromise in cost, efficiency and emission when used in Internal Combustion Engines. Thanks to its higher resistance to auto-ignition, engine efficiency can be increased through the use of higher compression ratios. Its high H/C ratio thanks to its low carbon level leads to lesscarbon dioxide, carbon monoxide and hydrocarbon emissions compared to gasoline fuels.