Yang Meng, Wu Yingtao, Tang Chenglong, Liu Yang, Huang Zuohua
State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, China.
State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, China.
J Hazard Mater. 2019 Sep 5;377:52-61. doi: 10.1016/j.jhazmat.2019.05.036. Epub 2019 May 23.
In this work, the weakest thermodynamic conditions for the auto-ignition of mixtures containing nitromethane were experimentally determined by using the rapid compression machine facility. Results show there is a narrow weak ignition region between ignition and non-ignition. The weak ignition region would disappear with the increase of the EOC (end of compression) pressure and nitromethane concentration. In addition, the ignition delay times for successful auto-ignition for different nitromethane concentrations and equivalence ratio mixtures were measured and compared. Results show that the dependence of nitromethane ignition on the equivalence ratio is weak. Subsequently, the measured ignition delay time data were employed to validate several kinetic models in literature and our previous model shows better agreement with experimental results, as well as other available literature data. Sensitivity analysis for the model reveals the importance of unimolecular decomposition and H-abstraction reactions for the ignition delay times in the temperature range studied herein. Finally, critical conditions for nitromethane ignition under extended conditions that are beyond the ability of the experimental facility were predicted.
在这项工作中，通过使用快速压缩机设备，实验确定了含硝基甲烷混合物自燃的最弱热力学条件。结果表明，在着火和不着火之间存在一个狭窄的弱着火区域。随着压缩终点（EOC）压力和硝基甲烷浓度的增加，弱着火区域将消失。此外，还测量并比较了不同硝基甲烷浓度和当量比混合物成功自燃的着火延迟时间。结果表明，硝基甲烷着火对当量比的依赖性较弱。随后，利用测得的着火延迟时间数据对文献中的几个动力学模型进行了验证，我们之前的模型与实验结果以及其他现有文献数据显示出更好的一致性。对该模型的敏感性分析揭示了在本文研究的温度范围内，单分子分解和氢提取反应对着火延迟时间的重要性。最后，预测了超出实验设备能力的扩展条件下硝基甲烷着火的临界条件。
