Parametric study of Syngas laminar flame speed for varying compositions
Session chaired by Pr. Epaminondas Mastorakos
The present work introduces new laminar flame speed experimental resultsfor three compositions of Syngas with varying initial pressure, initial temperature and equivalence ratios. Syngas compositions consist of five gases (H2, CO,N2, CO2, CH4) as mentioned Bridgwater (1995), with volume fractions relatedto different gasification techniques. Moreover, as a wide range of H2/CO ratios can be obtained, most of the studies on the combustion of Syngas considered mainly binary mixtures of H2 and CO. The objective of this study is to evaluate the effect of the other components on the laminar flame speed, one fundamental combustion parameter. For that, experimental measurements were realized by means of an optically accessible spherical vessel coupled with the high speed Schlieren technique to obtain images of the outwardly propagating spherical flame. The initial pressures and temperatures tested are ranged from 1 to 5 bar and 298 to 423 K with equivalence ratios ranging from rich mixtures to rich ones. The results obtained allow the determination of the parameters of the correlation proposed by Metgalchi and Keck (1982) for each Syngas composition. The accuracy of the correlation is also improved by comparing the laminarflame speed data obtained by kinetics simulation from Ansys CHEMKIN with different kinetics mechanisms available (San Diego Mechanism, Polimi Mechanism).
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