Kinetic modeling study of homogeneous ignition of dimethyl ether/hydrogen and dimethyl ether/methane
Kinetic modeling study of homogeneous ignition of dimethyl ether/hydrogen and dimethyl ether/methane
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DOI：
10.1016/j.applthermaleng.2017.03.065
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发表时间：
2017-06
影响因子：
6.4
通讯作者：
Ying Wang;Hong Liu;X. Ke;Zhenxing Shen
中科院分区：
文献类型：
--
作者：
Ying Wang;Hong Liu;X. Ke;Zhenxing Shen
本文采用数值模拟的方法，对不同比例的DME/H2和DME/CH 4混合燃料在空气中的均质着火燃烧进行了研究。重点对DME/H2和DME/CH 4双燃料着火燃烧过程中的动力学效应进行了评价。结果表明，在不同温度下，均质点火过程有明显的区别。在低温（900 K）下，DME/H2和DME/CH 4混合物的着火延迟时间均随DME混合比的减小而增大;此外，由于CH 4分子结构的稳定性，CH 4比H2更能有效地延迟DME的着火。在高温（1400 K）下，随着DME掺混比的减小，DME/CH 4混合燃料的着火延迟时间仍增大，而DME/H2混合燃料的着火延迟时间缩短。对DME/H2和DME/CH 4双燃料均质着火过程进行了敏感性分析、反应路径分析和主要污染物物种计算，确定了DME/H2和DME/CH 4双燃料均质着火过程中涉及的关键基元反应。
Homogeneous ignition combustion of different proportion DME/H2and DME/CH4blend fuels in the air is investigated through the numerical simulation with the detailed chemistry at the low and high temperatures in this paper. The emphasis is the assessment of the kinetic effects involved in the ignition combustion of DME/H2and DME/CH4dual-fuel. It is found that the homogeneous ignition process has a clear distinction at the different temperatures. At the low temperature (900 K), the ignition delay times of DME/H2blends and DME/CH4blends both show an increase with a decrease of the DME blending ratio; furthermore, it is observed that CH4addition is more effective than H2addition in terms of delaying the DME homogeneous ignition due to the stable molecular structure of CH4. At the high temperature (1400 K), with the decrease of DME blending ratio, the ignition delay time of DME/CH4blends is still increased, whereas, the ignition delay time of DME/H2blends is shortened. Sensitivity analysis, reaction path analysis and main pollutant species calculation are carried out and key elementary reactions involved in homogeneous ignition of DME/H2and DME/CH4dual fuel are also identified in this paper.