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本文分别采用考虑辐射重吸收的谱带辐射(SNBCK)模型及未考虑辐射重吸收的光学薄辐射(OPT)模型,对0.1～4 MPa,CO_2稀释比为0%和20%的一维预混层流合成气/空气火焰进行数值分析,研究辐射重吸收效应对可燃极限及极限处的火焰传播速度和温度的影响。结果表明,辐射重吸收效应能有效拓宽贫可燃极限,提高燃料中CO_2比例或提高CO/H_2比例都会加剧上述效果。辐射重吸收效应随压力增大而逐渐增强,并造成可燃极限处最大火焰温度随压力先增加后减小,在1 MPa左右达到峰值。
In this paper, we use the SNBCK model and the optical thin radiation (OPT) model that do not consider the reabsorption of radiation respectively. One-dimensional premixes with 0.1 ~ 4 MPa, 0% and 20% The laminar flow of syngas / air flame was numerically analyzed to study the effect of radiation reabsorption on flame propagation velocity and temperature at the flammability limit and limit. The results show that the effect of radiation reabsorption can effectively widen the limit of combustibles, increase the proportion of CO 2 in the fuel or increase the ratio of CO / H 2. The radiation reabsorption effect gradually increases with the increase of pressure, and the maximum flame temperature at the flammable limit increases first and then decreases with the increase of pressure, and reaches the peak at about 1 MPa.