A simple method for the quantitative assessment of soot production rate
A simple method for the quantitative assessment of soot production rate
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DOI：
10.1016/j.combustflame.2023.113043
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发表时间：
2023-12
影响因子：
4.4
通讯作者：
Kevin Gleason;Alessandro Gomez
中科院分区：
文献类型：
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作者：
Kevin Gleason;Alessandro Gomez
烟灰趋势已通过各种经验方法进行表征，例如烟度和阈值烟灰指数 (TSI)（可被视为定性）以及产量烟灰指数 (YSI)（半定量），因为它至少依赖于火焰中峰值烟灰体积分数的测量。所有这些技术都具有易于实施和依赖廉价设备的便利。在目前的工作中，我们提出了一种相对简单但定量的替代方法来确定逆流火焰中的烟灰产生率。该方法植根于使用：a）通过高温测定法测量烟灰体积分数，b）为确定温度和速度分布而建立的此类火焰的一维计算模型，以及c）烟灰控制方程的使用。该技术适用于多种脂肪族化合物，包括甲烷、丙烷、乙烯、丙烯和乙炔。测试的脂肪族化合物每单位火焰面积的烟尘产生率范围在 10−4 和 10−7g/(cm2s) 之间，并且当相对于碳通量标准化时，在 10−5 和 10−2 之间。在对数尺度上，它与所有燃料的峰值温度呈线性相关。烟灰产率按烷烃<烯烃<炔烃的规律排列，其中乙炔即使在相对较低温度的火焰中也表现出最高的烟灰倾向。
Sooting tendency has been characterized with various empirical approaches such as smoke height and Threshold Sooting Index (TSI), that can be regarded as qualitative, as well as Yield Sooting Index (YSI), that is semiquantitative since it relies on the measurements of at least the peak soot volume fraction in the flame. All these techniques have the convenience of being easy to implement and of relying on inexpensive equipment. In the present work we present a comparatively easy butquantitativealternative to determine the soot production rate in counterflow flames. The approach is rooted in the use of: a) soot volume fraction measurements by pyrometry, b) the well established one-dimensional computational modeling of such flames for the determination of temperature and velocity profiles and c) the use of the soot governing equation. The technique is applied to several aliphatics, including methane, propane, ethylene, propene and acetylene. Soot production rate per unit flame area for the tested aliphatics ranges between 10−4and 10−7g/(cm2s) and, when normalized with respect to the carbon flux, between 10−5and 10−2. On a logarithmic scale it correlates linealry with the peak temperature for all fuels. Soot yield scales as alkanes< alkenes < alkynes, with acetylene showing the highest sooting tendency even in flames at relatively low temperatures.