甲烷-正庚烷混合物的预混层流火焰研究
发布时间：2019-06-10 21:52
【摘要】：利用球形传播火焰试验和一维平面火焰数值模拟对0.1 MPa、393 K条件下甲烷-正庚烷混合物的预混层流燃烧特性进行了研究,其中当量比从0.7到1.5、甲烷含量从0到100%,.结果表明:随着甲烷含量的提高,甲烷-正庚烷混合物的层流燃烧速度和Markstein长度首先基本保持不变,呈现出与正庚烷类似的特性,当甲烷含量达到75%,时,其层流燃烧速度和Markstein长度开始不同于正庚烷,逐渐发生变化.结合层流燃烧速度的敏感性分析,对混合物一维平面火焰中主要自由基的浓度和主要基元反应的反应速率随甲烷含量的变化进行了研究,发现当甲烷含量增至75%,时,主要自由基(·H、·OH和·O)的摩尔分数峰值和基元反应(R1 H+O_2=O+OH、R24 CO+OH=CO_2+H)的反应速率峰值都开始发生变化.
[Abstract]:The premixed laminar combustion characteristics of methane-n-hexane mixture at 0.1 MPa,393 K were studied by spherical propagation flame test and one-dimensional plane flame numerical simulation. Methane content ranges from 0 to 100%. The results show that with the increase of methane content, the laminar combustion rate and Markstein length of methane-n-hexane mixture remain basically unchanged at first, showing the same characteristics as n-hexane. When the methane content reaches 75%, The laminar combustion rate and Markstein length are different from that of n-hexane, and change gradually. Combined with the sensitivity analysis of laminar combustion rate, the concentration of main free radicals and the reaction rate of main elementary reactions in one-dimensional plane flame of mixture were studied with the change of methane content. It was found that when the methane content increased to 75%, The peak value of mole fraction of the main free radicals (H, OH and O) and the peak value of the reaction rate of the elementary reaction (R1 H O 鈮，
本文编号：2496761
[Abstract]:The premixed laminar combustion characteristics of methane-n-hexane mixture at 0.1 MPa,393 K were studied by spherical propagation flame test and one-dimensional plane flame numerical simulation. Methane content ranges from 0 to 100%. The results show that with the increase of methane content, the laminar combustion rate and Markstein length of methane-n-hexane mixture remain basically unchanged at first, showing the same characteristics as n-hexane. When the methane content reaches 75%, The laminar combustion rate and Markstein length are different from that of n-hexane, and change gradually. Combined with the sensitivity analysis of laminar combustion rate, the concentration of main free radicals and the reaction rate of main elementary reactions in one-dimensional plane flame of mixture were studied with the change of methane content. It was found that when the methane content increased to 75%, The peak value of mole fraction of the main free radicals (H, OH and O) and the peak value of the reaction rate of the elementary reaction (R1 H O 鈮，
本文编号：2496761
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