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首页> 外文会议>International Symposium on Combustion; 20060805-11; University of Heidelberg(DE) >Addition of NO_2 to a laminar premixed ethylene-air flame: Effect on soot formation
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Addition of NO_2 to a laminar premixed ethylene-air flame: Effect on soot formation

机译：将NO_2添加到层流预混乙烯-空气火焰中：对烟灰形成的影响

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Experiments were conducted on a laminar premixed ethylene-air flame at equivalence ratios of 2.34 and 2.64. Comparisons were made between flames with 5% NO_2 added by volume. Soot volume fraction was measured using light extinction and light scattering and fluorescence measurements were also obtained to provide added insight into the soot formation process. The flame temperature profiles in these flames were measured using a spectral line reversal technique in the non-sooting region, while two-color pyrometry was used in the sooting region. Chemical kinetics modeling using the PREMIX 1-D laminar flame code was used to understand the chemical role of the NO_2 in the soot formation process. The modeling used kinetic mechanisms available in the literature. Experimental results indicated a reduction in the soot volume fraction in the flame with NO_2 added and a delay in the onset of soot as a function of height above the burner. In addition, fluorescence signals-often argued to be an indicator of PAH-were observed to be lower near the burner surface for the flames with NO_2 added as compared to the baseline flames. These trends were captured using a chemical kinetics model that was used to simulate the flame prior to soot inception. The reduction in soot is attributed to a decrease in the H-atom concentration induced by the reaction with NO_2 and a subsequent reduction in acetylene in the pre-soot inception region.
机译：在层流预混的乙烯-空气火焰上以2.34和2.64的当量比进行实验。在按体积添加5％NO_2的火焰之间进行了比较。使用消光和光散射来测量烟灰体积分数，还获得了荧光测量结果，以提供对烟灰形成过程的更多了解。这些火焰中的火焰温度曲线是通过光谱线反转技术在非non火区域进行测量的，而在烟ot区域则使用了两种颜色的高温测定法。使用PREMIX 1-D层流火焰代码进行化学动力学建模可了解NO_2在烟灰形成过程中的化学作用。该建模使用了文献中提供的动力学机制。实验结果表明，添加NO_2可以降低火焰中烟灰体积分数，并且烟尘开始时间的延迟取决于燃烧器上方的高度。此外，荧光信号（通常被认为是PAH的指标）被观察到，与基线火焰相比，添加NO_2的火焰在燃烧器表面附近较低。这些趋势是使用化学动力学模型捕获的，该模型用于模拟烟灰开始之前的火焰。烟灰的减少归因于由与NO_2的反应引起的H原子浓度的减少以及随后在烟灰前的起始区域中乙炔的减少。

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