中低温高压下正丁醇的自燃
Autoigniton of n-Butanol at Low to Intermediate Temperature and Elevated Pressure
摘要：
在加热快速压缩机上进行了正丁醇的自燃延迟实验。实验进行了15和30巴的压力下，在650-900 K的温度范围内，和当量比为0.5，1.0，和2.0。此外，初始燃料摩尔分数和初始氧气摩尔分数独立地变化，以确定各自对点火延迟的影响。在所研究的条件下，发现混合物的反应性随着当量比、初始燃料摩尔分数或初始氧气摩尔分数的增加而增加。实验数据的非线性相关性进行，并显示出近二阶依赖于初始氧气摩尔分数和近一阶依赖于初始燃料摩尔分数和压缩压力。这是第一次在这个温度和压力范围内对正丁醇的点火进行研究，有助于更好地了解这种燃料在与实际设备相关的条件下的化学性质。实验测得的点火延迟进行了比较，从文献中的几个反应机制计算的点火延迟。实验和模拟之间的协议被认为是不令人满意的。敏感性分析表明，母燃料分解反应的速率常数的不确定性发挥了主要作用，导致协议差。对燃料分解反应的进一步路径分析支持了这一结论，并强调了某些路径的特别重要性。根据这些结果，可以得出结论，需要对燃料分解进行进一步调查，包括形态测量。
英文摘要：
Autoignition delay experiments were performed for n-butanol in a heated rapid compression machine. Experiments were performed at pressures of 15 and 30 bar, in the temperature range 650-900 K, and for equivalence ratios of 0.5, 1.0, and 2.0. Additionally, the initial fuel mole fraction and initial oxygen mole fraction were varied independently to determine the influence of each on ignition delay. Over the conditions studied, it was found that the reactivity of the mixture increased as equivalence ratio, initial fuel mole fraction or initial oxygen mole fraction increased. A non-linear correlation to the experimental data was performed and showed nearly second order dependence on the initial oxygen mole fraction and nearly first order dependence on initial fuel mole fraction and compressed pressure. This was the first study of the ignition of n-butanol in this temperature and pressure range, and contributes to a better understanding of the chemistry of this fuel under the conditions relevant to practical devices. Experimentally measured ignition delays were compared against the ignition delay computed from several reaction mechanisms in the literature. The agreement between experiments and simulations was found to be unsatisfactory. Sensitivity analysis was performed and indicated that the uncertainties of the rate constants of parent fuel decomposition reactions play a major role in causing the poor agreement. Further path analysis of the fuel decomposition reactions supported this conclusion and highlighted the particular importance of certain pathways. Based on these results, it was concluded that further investigation of the fuel decomposition, including speciation measurements, will be required.
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