Burning Velocity and Markstein Length Blending Laws for Methane/Air and Hydrogen/Air Blends
Burning Velocity and Markstein Length Blending Laws for Methane/Air and Hydrogen/Air Blends
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DOI：
10.1016/j.fuel.2016.09.032
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发表时间：
2017
期刊：
影响因子：
7.4
通讯作者：
D. Bradley;M. Lawes;R. Mumby
中科院分区：
文献类型：
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作者：
D. Bradley;M. Lawes;R. Mumby
由于甲烷和氢气燃烧的化学动力学的对比，混合法的发展层流燃烧速度，ul，和Markstein长度的组成混合物的CH 4/空气和H2/空气提出了一个艰巨的挑战。通过研究层流燃烧速度的解析表达式来寻求指导。为了预测共混物的燃烧速度，仔细检查了六个共混定律。预测结果与Hu等人在大气条件下测得的燃烧速度进行了比较[1]。这些涵盖当量比范围从0.6至1.3，和整个燃料范围的H2除了甲烷。这使得能够对六个定律的预测准确性进行评估。最成功的法律是在本研究过程中开发的一个，涉及产品的质量分数加权，密度，反应热和比热，除以混合物的导热系数。尽管对几种可能性进行了仔细研究，但试图获得火焰速度Markstein长度Lb的一个非常成功的混合定律的成功率较低。详细给出了两种可能的方法，一个基于分数摩尔浓度的不足反应物。令人满意的经验定律采用产物ulLb的质量分数加权。
Because of the contrasting chemical kinetics of methane and hydrogen combustion, the development of blending laws for laminar burning velocity,ul, and Markstein length for constituent mixtures of CH4/air and H2/air presents a formidable challenge. Guidance is sought through a study of analytical expressions for laminar burning velocity. For the prediction of burning velocities of blends, six blending laws were scrutinised. The predictions were compared with the measured burning velocities made by Hu et al. under atmospheric conditions [1]. These covered equivalence ratios ranging from 0.6 to 1.3, and the full fuel range for H2addition to CH4. This enabled assessments to be made of the predictive accuracy of the six laws. The most successful law is one developed in the course of the present study, involving the mass fraction weighting of the product oful, density, heat of reaction and specific heat, divided by the thermal conductivity of the mixture. There was less success from attempts to obtain a comparably successful blending law for the flame speed Markstein length,Lb, despite scrutiny of several possibilities. Details are given of two possible approaches, one based on the fractional mole concentration of the deficient reactant. A satisfactory empirical law employs mass fraction weighting of the productulLb.