Progress in characterization of soot formation by optical methods

Progress in characterization of soot formation by optical methods
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光学方法表征烟灰形成的进展

DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
R. Suntz
R. Suntz
中科院分区：
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文献类型：
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作者：
H. Bockhorn;H. Geitlinger;B. Jungfleisch;T. Lehre;A. Schön;T. Streibel;R. Suntz

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一个二维的原位光学技术被用来测量绝对烟灰体积分数，粒子数密度，和平均粒子尺寸在中度煤烟层流和湍流扩散火焰具有高的空间和时间分辨率。这些数据是特别感兴趣的烟尘的形成和氧化模型的开发和验证。该技术（RAYLIX）是基于同时二维检测瑞利散射和激光诱导白炽（LII）与检测的积分消光从一个单一的激光脉冲相结合。所有信号都是由倍频Nd-YAG激光的单脉冲引起的。除了平均颗粒尺寸之外，特别感兴趣的是通过检测LII信号的时间衰减来获得关于颗粒尺寸分布的信息。然后可以通过使用以下公式模拟这种衰减来获得关于颗粒尺寸分布的信息： LII模型结合多维非线性回归。通过这种策略，改变描述颗粒尺寸分布以及周围气相的温度的参数，使得LII信号的计算衰减与测量衰减一致。除了这些数量也概率密度函数（PDF），相关函数和长度尺度来自于在湍流火焰中的烟尘体积分数。这些数量是特别感兴趣的湍流反应流的建模。
A two dimensional in situ optical technique is used to measure absolute soot volume fractions, particle number densities, and mean particle sizes in moderately sooting laminar and turbulent diffusion flames with high spatial and temporal resolution. These data are of special interest for the development and validation of models for the formation and oxidation of soot. The technique (RAYLIX) is based on the simultaneous two dimensional detection of Rayleigh scattering and the laser induced incandescence (LII) in combination with the detection of the integral extinction from one single laser pulse. All signals are induced by a single pulse of a frequency doubled Nd–YAG laser. Besides mean particle sizes it is of special interest to derive information about the particle size distribution by the detection of the temporal decay of the LII signal. Information about the particle size distribution can then be obtained by simulating this decay using a LII model in combination with multidimensional non-linear regression. With this strategy the parameters describing the particle size distribution as well as the temperature of the surrounding gas phase are varied so that the calculated decay of the LII signal is in accordance with the measured one. In addition to these quantities also probability–density functions (PDF), correlation functions and length scales are derived from the soot volume fraction in the turbulent flames. These quantities are of special interest for the modelling of turbulent reacting flows.