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首页> 外文期刊>Applied optics >Laser-induced incandescence for soot particle size measurements in premixed flat flames
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Laser-induced incandescence for soot particle size measurements in premixed flat flames

机译：激光诱导白炽灯，用于在预混平火焰中测量烟尘粒径

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摘要

Measurements of soot properties by means of laser-induced incandescence (LII) and combined scattering-extinction were performed in well-characterized premixed ethylene-air flames. In particular, the possibility of using LII as a tool for quantitative particle sizing was investigated. Particle sizes were evaluated from the temporal decay of the LII signal combined with heat balance modeling of laser-heated particles, and these sizes were compared with the particle sizes deduced from scattering-extinction measurements based on isotropic sphere theory. The correspondence was good early in the sootformation process but less good at later stages, possibly because aggregation to clusters began to occur. A critical analysis has been made of how uncertainties in different parameters, both experimental and in the model, affect the evaluated particle sizes for LII. A sensitivity analysis of the LII model identified the ambient-flame temperature as a major source of uncertainty in the evaluated particle size, a conclusion that was supported by an analysis based on temporal LII profiles.
机译：在充分表征的预混乙烯-空气火焰中，通过激光诱导白炽灯（LII）和组合散射消光法测量了烟尘性能。尤其是，研究了使用LII作为定量颗粒筛分工具的可能性。根据LII信号的时间衰减并结合激光加热的颗粒的热平衡模型来评估粒径，并将这些粒径与根据各向同性球体理论从散射消光测量得出的粒径进行比较。该对应关系在烟ot形成过程的早期是良好的，但在后期则较差，这可能是因为开始聚集到团簇了。已对实验和模型中不同参数的不确定性如何影响LII的评估粒径进行了严格的分析。 LII模型的敏感性分析确定了环境火焰温度是所评估粒径不确定性的主要来源，这一结论得到了基于时间LII曲线的分析的支持。

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