In order to study the PAHs and soot volume fraction, CHEMKIN software was used for the analysis of H2, CO and N2 effects on the PAHs and soot formation in a premixed laminar C2H2 flame numerically. To have good understanding on effects of additives on PAH formation and intermediate species like OH, H2 and C2H2, C3H3, C4H4, C5H5 and soot volume fraction, some simulations were performed under different addition ratios (0%, 20% and 40%) of H2, CO and N2. The ABF mechanism which includes C1 and C2 chemistry, PAH growth was used to understand the particle inception and mole fractions of intermediate species. Prior to performing simulation, the performance of model prediction for soot, PAH and mole fraction of intermediate products was validated and calculations were performed and compared with the experimental results. Hydrogen showed strong chemical effect when it is added into the unburned mixture. The mole fractions of important soot antecedent species such C2H2 and PAH were inhibited significantly as compared to the cases of CO/N2 addition. However, the aromatic radical is limited by the excess of H2, thus causing the lower production rate of large PAHs. In addition, results showed that hydrogen, carbon Monoxide and nitrogen additions lead to the reduction of temperature. To study the effects of additions on soot generation, N2/CO/H2 were added to C2H2/air flame from 0% to 40%. The results showed that N2/CO/H2 reduced the soot volume fraction.
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