Laminar flame characteristics and kinetic modeling study of methanol-isooctane blends at elevated temperatures
Laminar flame characteristics and kinetic modeling study of methanol-isooctane blends at elevated temperatures
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高温下甲醇-异辛烷混合物的层流火焰特性和动力学模型研究
DOI：
10.1016/j.fuel.2016.07.087
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发表时间：
2016-11
期刊：
影响因子：
7.4
通讯作者：
Huang Zuohua
中科院分区：
文献类型：
--
作者：
Li Qianqian;Zhang Weijie;Jin Wu;Xie Yongliang;Huang Zuohua
采用定容燃烧室中的球形传播火焰，在两种初始温度(363和393kK)、不同的甲醇掺混比(0%、20%、40%、80%、100%)和超当量比0.7~1.6的条件下，对甲醇-异辛烷混合燃料的层流火焰速度进行了实验测定。为了消除数据处理中的拉伸效应，采用了非线性方法。结果表明，甲醇火焰的层流火焰速度在当量比为1.2左右时达到峰值，异辛烷火焰的层流火焰速度在当量比为1.1左右时达到峰值。对于甲醇含量小于40%的混合气，在所有当量比下，层流火焰速度均有一定程度的提高。然而，进一步增加甲醇加入量将大大加快浓淡混合气侧的层流火焰速度，而对稀薄混合气侧的层流火焰速度影响不大。当量比大于某一临界值时，Markstein长度随甲醇加入量的增加而增大，而当量比小于临界值时，Markstein长度呈减小趋势。临界当量比介于1.2和1.3之间。在热效应、扩散效应和动力学效应中，动力学效应是引起层流火焰速度随掺混比变化的主要因素。在混沌等人的异辛烷模型的基础上，发展了一个动力学模型(IM模型)。(2007)。IM模型对测量的层流火焰速度在所有条件下都有很好的预测效果。反应路径表明，在富混相侧的异辛烷中加入甲醇时，促进了HCO和H的生成，抑制了稳定物种的生成，从而提高了层流火焰的速度。从灵敏度分析和反应自由基浓度两个方面验证了这些行为。
Laminar flame speeds of methanol-isooctane blends were experimentally determined using the spherically propagating flame in a constant volume chamber at two initial temperatures (363 and 393 K), different blending ratios of methanol in liquid volume (0%, 20%, 40%, 80%, 100%), and over equivalence ratios of 0.7–1.6. Nonlinear methodology was employed to remove the stretch effect in the data processing. Results indicate that laminar flame speeds of methanol flame reach the peak at equivalence ratio around 1.2 and that of isooctane at equivalence ratio around 1.1. For the mixtures with less than 40% methanol, laminar flame speeds show moderate increase at all equivalence ratios. However, further increasing methanol addition will greatly accelerate laminar flame speeds at rich mixture sides but give slight change at lean mixture sides. Markstein length shows an increase tendency with the methanol addition at the equivalence ratios larger than a critical value while Markstein length gives a decrease tendency at the equivalence ratios smaller than the critical value. The critical equivalence ratio is between 1.2 and 1.3. Among the thermal effect, diffusive effect and kinetic effect, the kinetic effect was found to be the major factor bringing the variation of laminar flame speed with the variation of blending ratio. A kinetic model (IM model) was developed on the basis of the isooctane model of Chaos et al. (2007). The IM model shows good prediction on measured laminar flame speeds under all conditions. Reaction pathway reveals that the HCO and H productions are promoted while the productions of stable species are inhibited in the case of methanol addition into the isooctane at rich mixture sides, resulting in the laminar flame speed enhancement. These behaviors are verified from the sensitivity analysis and the concentrations of the reactive radicals.
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影响因子：
4.4
作者：
Halter, F.;Tahtouh, T.;Mounaim-Rousselle, C.
通讯作者：
Mounaim-Rousselle, C.
DOI：
10.4271/800103
发表时间：
1980-02
期刊：
--
影响因子：
--
作者：
C. Ryan;S. Lestz
通讯作者：
C. Ryan;S. Lestz
影响因子：
5
作者：
Lan Li;Yunshan Ge;Mingda Wang;Jiaqiang Li;Zihang Peng;Yanan Song;Liwei Zhang
通讯作者：
Lan Li;Yunshan Ge;Mingda Wang;Jiaqiang Li;Zihang Peng;Yanan Song;Liwei Zhang
影响因子：
5.3
作者：
Jun Li;Changming Gong;Enyu Wang;Xiumin Yu;Z. Wang;Xunjun Liu
通讯作者：
Jun Li;Changming Gong;Enyu Wang;Xiumin Yu;Z. Wang;Xunjun Liu
影响因子：
7.4
作者：
Beeckmann, J.;Cai, L.;Pitsch, H.
通讯作者：
Pitsch, H.