正丁醇的高压中低温自燃
Autoignition of n-Butanol at Elevated Pressure and Low to Intermediate Temperature
摘要：
使用加热的快速压缩机在15和30巴的压缩压力下，在675-925 K的压缩温度范围内，以及当量比为0.5，1.0和2.0的情况下，对正丁醇进行了自燃实验。在所研究的条件下，点火延迟随着温度的升高而单调减小，自燃响应表现出单阶段特性。一个非线性拟合的实验数据和反应性，在点火延迟的倒数方面，显示出近二阶依赖于初始氧摩尔分数和略大于一阶依赖于初始燃料摩尔分数和压缩压力。实验测得的点火延迟也进行了比较，使用几种反应机制在文献中的模拟。模拟和实验点火延迟之间的协议被发现是不令人满意的。敏感性分析是最近的一种机制，并表明，在父燃料分解反应的速率系数的不确定性发挥了重要作用，导致不良的协议。燃料分解反应的路径分析支持这一结论，也突出了某些途径的特别重要性。需要对燃料分解进行进一步的实验研究，包括形态测量。
英文摘要：
Autoignition experiments for n-butanol have been performed using a heated rapid compression machine at compressed pressures of 15 and 30 bar, in the compressed temperature range of 675-925 K, and for equivalence ratios of 0.5, 1.0, and 2.0. Over the conditions studied, the ignition delay decreases monotonically as temperature increases, and the autoignition response exhibits single-stage characteristics. A non-linear fit to the experimental data is performed and the reactivity, in terms of the inverse of ignition delay, shows nearly second order dependence on the initial oxygen mole fraction and slightly greater than first order dependence on initial fuel mole fraction and compressed pressure. Experimentally measured ignition delays are also compared to simulations using several reaction mechanisms available in the literature. Agreement between simulated and experimental ignition delay is found to be unsatisfactory. Sensitivity analysis is performed on one recent mechanism and indicates that uncertainties in the rate coefficients of parent fuel decomposition reactions play a major role in causing the poor agreement. Path analysis of the fuel decomposition reactions supports this conclusion and also highlights the particular importance of certain pathways. Further experimental investigations of the fuel decomposition, including speciation measurements, are required.
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