Journal of Northeastern University Natural Science ›› 2017, Vol. 38 ›› Issue (10): 1496-1500.DOI: 10.12068/j.issn.1005-3026.2017.10.026

• Resources & Civil Engineering • Previous Articles     Next Articles

Effect of H2O on Propagation of Laminar Syngas Flames

SHANG Rong-xue, LI Gang, ZHANG Pei-hong   

  1. School of Resource & Civil Engineering, Northeastern University, Shenyang 110819, China.
  • Received:2016-12-23 Revised:2016-12-23 Online:2017-10-15 Published:2017-10-13
  • Contact: Li Gang
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Abstract: The laminar flame speeds of syngas/air mixtures with H2O dilution in the fuels were numerically studied at 400K using Davis-Mech. Based on the calculated sensitivities of mass burning rate of mixtures with various H2O dilution ratios, the thermal, direct-reaction and third-body effects on the laminar flame speed of diluted mixtures were also carried out for an insightful understanding of the dilution effect of H2O. The results showed that when the volume fraction of H2 is larger than 25%, the laminar flame speed, adiabatic flame temperature and the mole fractions of the crucial radical of mixtures decrease significantly with the increase of dilution ration. The total dilution effect of H2O was dominated by the thermal effect. When the equivalence ratio of mixture was small, the direct reaction effect caused by H2O on the laminar flame speed was changed from promotion into inhibition with increasing volume fraction of H2. When the amount of H2O was limited, the third-body effect on the laminar flame speed experiences a significant inhibition-promotion-inhibiting action.

Key words: syngas, H2O, laminar flame speed, dilution effect, third-body effect

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