Ignition delay times of diethyl ether measured in a high-pressure shock tube and a rapid compression machine
Ignition delay times of diethyl ether measured in a high-pressure shock tube and a rapid compression machine
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DOI：
10.1016/j.proci.2014.06.143
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发表时间：
2015
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影响因子：
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通讯作者：
M. Werler;L. R. Cancino;R. Schießl;U. Maas;C. Schulz;M. Fikri
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文献类型：
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作者：
M. Werler;L. R. Cancino;R. Schießl;U. Maas;C. Schulz;M. Fikri
在压力为10、20和40巴、温度为900至1300 K的激波管中以及在快速压缩机（RCM）中以不同当量比研究了乙醚（DEE）/空气/氩气混合物的点火延迟时间。在500至1060 K之间，压力在2.5至13巴之间。在2.5和5.5 bar之间，RCM结果表明，DEE的点火延迟时间呈现出一个区域（590和800 K之间），在该区域点火延迟时间仅与温度弱相关，而在833 K以上和590 K以下，点火延迟时间与温度强相关。在RCM测量中，在500至665 K的温度范围内观察到两阶段点火。在激波管条件下，点火延迟时间具有很强的压力和温度依赖性，但在所研究的温度范围内没有发现非热（NTC）行为。使用Yasunaga等人（2010年）[15]的机制基于详细化学的模拟表明，在高压下，点火延迟时间对HO 2从乙醚中提取两个H原子的反应具有高灵敏度。通过将这两个反应的速率系数相对于原始值增加五倍，该机制很好地描述了我们的测量结果，并且仍然很好地再现了Yasunaga等人的原始数据。（2010）[15]。
Ignition delay times of diethyl ether (DEE)/air/argon mixtures were studied in a shock tube in the temperature range from 900 to 1300 K at pressures of 10, 20, and 40 bar and in a rapid compression machine (RCM) at various equivalence ratios between 500 and 1060 K at pressures between 2.5 and 13 bar. Between 2.5 and 5.5 bar, the RCM results show that ignition delay times of DEE exhibit a region (between 590 and 800 K) where ignition delay times are weakly temperature dependent only, while above 833 K and below 590 K, the ignition delay times are strongly temperature dependent. Two-stage ignition was observed in the temperature range from 500 to 665 K in the RCM measurements. At the conditions of the shock tube, a strong pressure and temperature dependence of the ignition delay times was observed, but no non-thermal (NTC) behavior was found in the investigated temperature range. Simulations based on detailed chemistry using the mechanism of Yasunaga et al. (2010) [15] indicate that at high pressures ignition delay times show a high sensitivity towards the two H-atom abstraction reactions by HO2from diethyl ether. By increasing the rate coefficients of these two reactions relative to the original values by a factor of five, the mechanism well describes our measurements and still well reproduces the original data of Yasunaga et al. (2010) [15].