Experimental and numerical study of the effect of elevated pressure on laminar burning velocity of lean H2/CO/O2/diluents flames
作者： Shixing Wang , Zhihua Wang , Xinlu Han , Chenlin Chen , Yong He
DOI: 10.1016/J.FUEL.2020.117753
关键词: Adiabatic process 、 Analytical chemistry 、 Heat flux 、 Order of reaction 、 Laminar flow 、 Materials science 、 Mole fraction 、 Syngas 、 Diluent 、 Adiabatic flame temperature
摘要: Abstract Laminar burning velocities (SL) of H2/CO/O2/diluents (He or N2) were reported at lean conditions (ϕ = 0.5–1.0), elevated pressures (1–11 bar) and a wide range H2-CO volumetric ratios. A new high-pressure rig based on specially designed heat flux burner was applied to obtain planar, adiabatic stretch-less flames used for laminar velocity measurements. Five popular syngas oxidation mechanisms tested against the obtained SL data showed satisfactory agreement even high up 11 bar. decreases as pressure increases while negative dependence mass rate is experimentally numerically found with diluent content in oxidizer hydrogen fuel, which indicated overall reaction order flame temperature. Sensitivity production analyses that sensitivity coefficients HO2 mole fraction increase maximum minimum then decreases, leads larger uncertainty predicting higher pressures. The front height represented by peak OH* chemiluminescence location also shows non-monotonic variation trend can serve target mechanism validation.
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