Effect of natural gas composition on the laminar burning velocities at elevated temperatures

摘要: Laminar burning velocities of fuel mixtures methane/ethane/propane with the compositions 100/0/0, 80/20/0, 80/0/20 and 80/10/10 vol% air were determined experimentally using heat flux method at 1 atm initial gas temperatures 298, 318 338 K. The selected as surrogates for natural gas, aim to investigate effect heavier hydrocarbons on laminar velocity main component, methane. It was found, in agreement literature data, that increase compared methane + flames. A common correlation temperature dependence S L = L0 (T/T 0 ) α , where T is a reference this temperature, used interpret new measurements. power exponents, α, derived from experimental data three gas. found practically identical all studied. measurements have been modelling two kinetic schemes: recent version Aramco mech 2.0 an updated model developed by authors. Both mechanisms show systematic trends slight over- under-prediction velocities, respectively, blends. However, accurately reproduced these models. Further analysis indicates even though rate constants reactions determining flame propagation are somewhat different mechanisms, exponents not sensitive differences. This that, detailed schemes capable predicting specific mixture able operate higher well, least lean moderately rich mixtures.