Aiming at the effect of CO2 mixing in the preparation and application of syngas fuel from biomass,numerical simulations are conducted in syngas/air/CO2 flame,the effect of radiation reabsorption on laminar flame speed is studied by different radiation models.Results show that the radiation reabsorption increase the flame speed of syngas/air/CO2 mixtures,the relative increment is up to 11.15%.With the increase of equivalence ratio,the increase of flame speed induced by radiation reabsorption effect decrease from 11.15%to 3.12%,which is controlled by the preheat-induced chemical effect.H radicals play the dominant role in the fuel-lean conditions,and the radiation reabsorption effect affects the flame speed through the reaction H+O2==O+OH,while at the fuel-rich conditions,the reaction H+OH+M==H2O+M related to OH radicals is the dominant reaction.
万方数据