Flame Characteristics of Syngas Micromix with Coflow
The study investigates the flame structure of a coflow micromixer single nozzle using CO and H2 synthesis gas with an equimolar ratio.The simulations are conducted in the Fluent platform employing steady-state,incompressible Navier-Stokes equations to examine the effects of various exit velocities and equivalence ratios on the flame structure.The results indicate that the distribution of OH aligns closely with the high-temperature zone,consistent with the heat release rate of chemical reactions in regions of high OH concentration.With an increase in equivalence ratio,the airflow velocity on the air side decreases,leading to the gradual merging of the flame fronts,ultimately resulting in the flame attachment at the nozzle exit.Increasing the exit velocity of the nozzle enhances jet entrainment,carrying HO2 and O2 from the surroundings,and rapidly oxidizing H to OH,thereby reducing the thickness of the reaction zone.Coflow facilitates the process of CO oxidation to generate HCO,consequently reducing the heat dissipation of the main flame to the surroundings.
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