Effects of Hydrogen Addition on the Laminar Flame Speed and Markstein Length of Premixed Dimethyl Ether–Air Flames
Effects of Hydrogen Addition on the Laminar Flame Speed and Markstein Length of Premixed Dimethyl Ether–Air Flames
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DOI：
10.1021/acs.energyfuels.5b00501
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发表时间：
2015-06
期刊：
影响因子：
5.3
通讯作者：
Huibin Yu;Erjiang Hu;Y. Cheng;Kefeng Yang;Xinyi Zhang;Zuo-hua Huang
中科院分区：
文献类型：
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作者：
Huibin Yu;Erjiang Hu;Y. Cheng;Kefeng Yang;Xinyi Zhang;Zuo-hua Huang
在定容弹中测量了不同温度、当量比和掺氢比下二甲醚/氢气/空气预混火焰的层流火焰速度。结果表明，层流火焰速度随着掺氢比和初始温度的增加而增加。Wang模型和Zhao模型均能较好地预测共混物的层流火焰速度。此外，有效刘易斯数的三种不同的模型进行了验证，体积分数加权模型进行预测Markstein长度。系统地研究了掺氢对混合燃料火焰速度和Markstein长度的影响。与热效应和扩散效应相比，由氢添加引起的化学动力学效应在增加层流火焰速度方面起着主导作用。此外，在Markstein长度的变化趋势中存在一个临界当量比。当当量比小于临界当量比时，马克数的计算结果与实验结果吻合较好。
Laminar flame speeds of premixed dimethyl ether/hydrogen/air flames were measured in a constant volume bomb at different temperatures, equivalence ratios, and hydrogen blending ratios. Results reveal that laminar flame speeds increase with an increased hydrogen blending ratio and initial temperature. The Wang model and Zhao model both perform well in predicting laminar flame speeds of the blends. Furthermore, three different models for an effective Lewis number are validated, and the volume-fraction-weighted model performs well in predicting the Markstein length. The effects of hydrogen addition on the flame speed and Markstein length of fuel blends are systematically studied. The chemical kinetic effect induced by hydrogen addition plays a dominant role in increasing the laminar flame speed in comparison to thermal and diffusive effects. In addition, there exists a critical equivalence ratio in the trend of the Markstein length. At the equivalence ratio less than the critical equivalence ratio, the Marks...