Experimental and kinetic modeling investigation on laminar premixed benzene flames with various equivalence ratios
Experimental and kinetic modeling investigation on laminar premixed benzene flames with various equivalence ratios
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DOI：
10.1016/j.proci.2014.05.085
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
Jiuzhong Yang;Long Zhao;Wenhao Yuan;F. Qi;Yuyang Li
中科院分区：
文献类型：
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作者：
Jiuzhong Yang;Long Zhao;Wenhao Yuan;F. Qi;Yuyang Li
在30 Torr压力下，研究了当量比为0.75 ~ 2.0的6种苯/氧/氩层流预混火焰的化学结构。利用同步辐射真空紫外光电离质谱（SVUV-PIMS）对火焰中的几十种火焰物种，特别是自由基和大分子芳烃进行了定性和定量分析。从我们以前的芳烃燃料模型开发的动力学模型来模拟苯的分解和大芳烃的形成，并对测量的火焰物种的摩尔分数分布进行验证。通过对贫燃和富燃火焰中苯的生成速率分析，详细讨论了苯的分解过程和C6及更小产物的去向。苯、苯基自由基和正丁基自由基是大芳烃的主要前体，苯火焰中多环芳烃生成量较烷基苯火焰低主要是由于苯甲基自由基生成量较低，这与前人研究中苯和烷基苯的碳烟生成趋势一致.
Chemical structures of six laminar premixed benzene/oxygen/argon flames with equivalence ratios from 0.75 to 2.0 were investigated at 30 Torr. Dozens of flame species, especially radicals and large aromatics, were qualitatively identified and quantitatively measured using synchrotron vacuum ultraviolet photoionization mass spectrometry (SVUV-PIMS). A kinetic model was developed from our previous models of aromatic fuels to simulate the decomposition of benzene and formation of large aromatics, and was validated against the measured mole fraction profiles of flame species. Based on the rate of production analysis in the leanest and richest flames, the decomposition processes of benzene and the fate of C6and smaller products were discussed in detail. Benzene, phenyl radical and cyclopentadienyl radical are concluded as key precursors of large aromatics, and the low formation of PAHs in rich benzene flames compared with rich alkylbenzene flames mainly derives from the low production of benzyl radical, which is consistent with the observed trends of the sooting tendencies of benzene and alkylbenzenes in previous studies.