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科学通报  2011 

激波管研究煤油/空气混合气的自着火特性

, PP. 85-93

Keywords: 激波管,着火滞燃期,煤油,敏感性分析

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Abstract:

利用反射激波方法开展了煤油/空气混合气在温度为1445~1650K,压力为0.1MPa,当量比为1.0条件下的着火滞燃期研究.采用拉瓦尔喷管雾化装置雾化煤油形成气溶胶,入射激波促使煤油气溶胶快速蒸发和扩散,反射激波诱导煤油/空气混合气着火.利用ICCD冻结煤油/空气混合气着火流场,进行着火特性的可视化分析.初始温度增加,煤油/空气混合气着火变强,温度小于1515K时,在整个观察范围内,火焰呈现连续但不规律形态.温度大于1560K时,火焰呈平面但不连续形态.实验结果表明煤油/空气混合气的着火滞燃期随初始温度的增加而缩短,在整个研究范围内,煤油/空气混合气的总活化能未发生变化.实验结果与文献数据吻合很好.本文提出了新的三组分(10%甲苯/10%乙苯/80%正葵烷)煤油替代品,并使用Honnet机理进行着火滞燃期的数值模拟,在整个研究范围内,计算值与实验值有较好的吻合性.敏感性分析表明,反应H+O2OH+O对着火滞燃期的敏感性系数最高,随着温度增加,敏感性系数随之增加.CH3的消耗反应对整个链分支反应起促进作用,正葵烷的脱氢反应对整个链反应起抑制作用.基元反应速率(ROP)和瞬态放热率分析得出H+O2OH+O和O+H2OH+H是OH生成的主要基元反应,同时也是着火过程中主要吸热反应,链终止反应R3是着火过程中主要的放热反应.火焰结构分析表明CO和H2O出现在主燃之前,并导致初始压力在显著着火之前略有升高.

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