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本文利用定容燃烧弹和激波管测量了C1-C4低碳烷烃燃料(甲烷、乙烷、丙烷和正丁烷)在不同压力和温度下的预混层流燃烧速度和着火延迟期,并利用Chemkin软件对预混层流燃烧和着火过程进行了模拟计算和化学反应动力学分析。实验结果和计算结果均表明,在相同工况下,四种烷烃的层流燃烧速度值分别为:甲烷最小,乙烷最快,丙烷和正丁烷相差不大并介于甲烷和乙烷之间;四种烷烃的着火延迟期分别为:甲烷最大,乙烷最快,丙烷和正丁烷相差不大并介于甲烷和乙烷之间。随着当量比的增加,甲烷混合气的马克斯坦长度增大,而乙烷、丙烷和正丁烷的减小。通过化学反应动力学分析和敏感性分析解释了上述现象。
In this paper, pre-mixed laminar flow and ignition delay of C1-C4 lower alkane fuel (methane, ethane, propane and n-butane) under different pressures and temperatures were measured by constant volume combustion bomb and shock tube. Chemkin software was used to simulate the pre-mixed laminar-flow combustion and ignition process and analyze chemical reaction kinetics. The experimental results and the calculated results show that the laminar-flow combustion velocities of the four alkanes under the same conditions are as follows: methane is the smallest, ethane is the fastest, propane and n-butane are not big difference, and between methane and ethane The ignition delay time of the four alkanes are respectively: the largest methane, the fastest ethane, the small difference between propane and n-butane and between methane and ethane. As the equivalence ratio increases, the length of marxam of the methane mixture increases, while the decrease of ethane, propane and n-butane increases. This phenomenon is explained by chemical reaction kinetics and sensitivity analysis.