Laminar burning velocities and Markstein numbers of syngas-air mixtures
Laminar burning velocities and Markstein numbers of syngas-air mixtures
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DOI：
10.1016/j.fuel.2009.11.008
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发表时间：
2010-08-01
期刊：
影响因子：
7.4
通讯作者：
Malheiro, Salvador
中科院分区：
文献类型：
--
作者：
Monteiro, Eliseu;Bellenoue, Marc;Malheiro, Salvador
在目前报道的工作中，H（2），CO，CH（4），CO（2）和N（2）的三种典型混合物被认为是木材气化的发生炉气的代表。层流燃烧速度已确定从纹影火焰图像在正常的温度和压力下，在一个范围内的当量比的可燃性限制。研究了火焰拉伸速率对燃烧过程的影响。合成气-空气火焰的燃烧表现出火焰半径与时间的线性关系。合成气-空气火焰速度的最大值在化学计量当量比下观察到，而贫或富混合物具有较低的火焰速度。合成气热值越高，合成气混合物的层流燃烧速度越高。Markstein数表明典型的合成气-空气火焰通常是不稳定的。Karlovitz数表明，典型的合成气-空气火焰受拉伸率的影响很小。根据实验数据，提出了合成气-空气火焰层流燃烧速度的计算公式。典型合成气组合物的层流燃烧速度的大小与包含5%H（2）/95%CO的模拟混合物的层流燃烧速度相当，并且证明与甲烷类似，尽管比丙烷稍慢。(C)2009爱思唯尔有限公司保留所有权利。
In the currently reported work, three typical mixtures of H(2), CO, CH(4), CO(2) and N(2) have been considered as representative of the producer gas coming from wood gasification. Laminar burning velocities have been determined from schlieren flame images at normal temperature and pressure, over a range of equivalence ratios within the flammability limits. The study of the effects of flame stretch rate was also performed. Combustion demonstrates a linear relationship between flame radius and time for syngas-air flames. The maximum value of syngas-air flame speeds is observed at the stoichiometric equivalence ratio, while lean or rich mixtures have lower flame speeds. The higher is the syngas heat value the higher is the laminar burning velocity of the syngas mixture. Markstein numbers show that typical syngas-air flames are generally unstable. Karlovitz numbers indicates that typical syngas-air flames are little influenced by stretch rate. Based on the experimental data, a formula for calculating the laminar burning velocities of syngas-air flames is proposed. The magnitude of laminar burning velocity for typical syngas compositions is comparable to that of a simulated mixture comprising 5%H(2)/95% CO and proved to be similar to methane, although somewhat slower than propane. (C) 2009 Elsevier Ltd. All rights reserved.