Shock Tube Measurements and Kinetic Investigation on the Ignition Delay Times of Methane/Dimethyl Ether Mixtures
Shock Tube Measurements and Kinetic Investigation on the Ignition Delay Times of Methane/Dimethyl Ether Mixtures
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甲烷/二甲醚混合物点火延迟时间的激波管测量和动力学研究
DOI：
10.1021/ef301339m
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发表时间：
2012-11-01
期刊：
影响因子：
5.3
通讯作者：
Huang, Zuohua
中科院分区：
文献类型：
--
作者：
Tang, Chenglong;Wei, Liangjie;Huang, Zuohua
在这项工作中，在多种条件下测量了化学计量甲烷/二甲醚 (DME) 在反射冲击波后的点火延迟时间：温度在 1134 到 2105 之间，压力为 1、5 和 10 bar，DME。混合比从0到100%（M100到M0），氩气浓度为95%。通过将测得的 DME 点火延迟时间与文献值进行比较来验证本激波管设施，并用于测量随后的甲烷/DME 点火延迟时间。所有混合物的点火延迟时间均表现出负压依赖性。对于给定温度，仅 1% DME 存在时，甲烷/DME 的着火延迟时间就显着缩短。随着DME混合比例的增加，着火延迟时间相应减少；但DME的促燃效果降低。使用两种最近开发的动力学机制计算的甲烷/DME 混合物的点火延迟时间与测量结果进行了比较。 NUI C4机制对甲烷的着火、延迟时间有很好的预测。随着 DME 混合比例的增加，该模型的性能变得温和。Zhao 的 DME 模型对本工作中研究的所有混合物都产生了良好的预测；因此选择它来分析甲烷/DME 燃料混合物的点火动力学，通过该动力学解释 DME 添加在促进点火方面的非线性效应
In this work, the ignition delay times of stoichiometric methane/dimethyl ether (DME) were measured behind the reflected shock waves over a wide, range of conditions: temperatures between 1134 and 2105 pressures of 1, 5, and 10 bar, a DME. blending ratio from 0 to 100% (M100 to M0), and an argon concentration of 95%. The present shock tube facility was validated by comparing the measured ignition delay times of DME with literature values and Was used for measurement of the subsequent methane/DME ignition delay times. The ignition delay times of all mixtures exhibit a negative pressure dependence. For a given temperature, the ignition delay time of methane/DME decreases remarkably with the presence of only 1% DME. As the DME blending ratio increases, the ignition delay times are correspondingly decreased; however, the ignition promotion effect of DME is decreased. The Calculated ignition delay times of methane/DME mixtures using two recently developed kinetic, mechanisms are compared with those of measurements. The NUI C4 mechanism yields good prediction for the ignition,delay time of methane. With an increase of the DME blending ratio, the performance of this model becomes moderated Zhao's DME model yields good prediction for all of the mixtures studied in this work; thus it was selected for analyzing the ignition kinetics of methane/DME fuel blends, through which the nonlinear effect of DME addition in promoting ignition is interpreted