A systematic numerical study of the laminar burning velocity of iso-octane/syngas/air mixtures
A systematic numerical study of the laminar burning velocity of iso-octane/syngas/air mixtures
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异辛烷/合成气/空气混合物层流燃烧速度的系统数值研究
DOI：
10.1016/j.ces.2018.10.002
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发表时间：
2019-02
影响因子：
4.7
通讯作者：
Shaozeng Sun
中科院分区：
文献类型：
--
作者：
Huanhuan Xu;Fengshan Liu;Shaozeng Sun
采用详细的反应机理对异辛烷/合成气/空气混合物在大当量比（0.4-1.4）范围内的层流燃烧速度进行了数值模拟，研究了初始温度为423 K，常压和高压下异辛烷/合成气/空气混合物的层流燃烧速度。燃料混合物中合成气的摩尔分数从0（纯异辛烷）到1（纯合成气）的整个范围变化。为了考虑合成气组成的大变化，考虑以下三种合成气组成：75体积% H2 - 25体积%CO、50体积% H2 - 50体积%CO和25体积% H2 - 75体积%CO。结果表明，异辛烷/合成气/空气混合气的层流燃烧速度随合成气含量的增加而增加，尤其是在合成气中H2含量较高和富氢混合气中。合成气中H2的化学作用是提高燃烧速度的主要原因。燃烧速度与燃料混合物的合成气稀释水平线性相关，而不管当稀释水平低时如何限定合成气稀释比。当稀释比定义为Yu等人（1986）提出的稀释比时，线性相关性在很宽的合成气稀释范围内保持不变。H2添加和CO添加对自由基池的影响不同，H被认为是当前条件下异辛烷/合成气/空气混合物燃烧速度的动力学指标。还进行了详细的灵敏度和途径分析，以确定显着影响异辛烷/合成气/空气混合物的燃烧速度的反应，并说明异辛烷/合成气/空气混合物中的H2，CO和异辛烷之间的动力学相互作用。
The laminar burning velocities of iso-octane/syngas/air mixtures were numerically investigated using a detailed reaction mechanism over a wide range of equivalence ratio (0.4–1.4) at atmospheric and elevated pressure at an initial temperature of 423 K. The mole fraction of syngas in the fuel mixture was varied from the entire range of 0 (pure iso-octane) to 1 (pure syngas). To take into account the large variations of syngas compositions, the following three syngas compositions are considered: 75%H2-25%CO, 50%H2-50%CO, and 25%H2-75%CO by volume. The results show that the laminar burning velocity of iso-octane/syngas/air mixtures increases with the content of syngas, especially for higher H2content in syngas and rich mixtures. The enhanced burning velocity is attributed to the chemical effects of H2in syngas. The burning velocity correlates linearly with the level of syngas dilution of the fuel mixture, regardless of how the syngas dilution ratio is defined when the dilution level is low. The linear correlation remains over a wide range of syngas dilution when the dilution ration is defined as that introduced by Yu et al. (1986). H2addition and CO addition affect the radical pool differently and H is found to be a kinetics indicator for the burning velocity of iso-octane/syngas/air mixtures under the current conditions. Detailed sensitivity and pathway analysis was also conducted to identify reactions that significantly affect the burning velocity of iso-octane/syngas/air mixtures and to illustrate the kinetics interactions between H2, CO, and iso-octane in iso-octane/syngas/air mixtures.
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影响因子：
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