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首页> 外文期刊>Journal of liquid chromatography and related technologies >Analysis of soot particles emitted from a modern light duty diesel engine running in different operating conditions using field flow fractionation and granulometric techniques
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Analysis of soot particles emitted from a modern light duty diesel engine running in different operating conditions using field flow fractionation and granulometric techniques

机译：使用场流分馏和粒度分析技术分析在不同工况下运行的现代轻型柴油机排放的烟尘颗粒

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摘要

Soot particles emitted from a light duty (LD) Volkswagen diesel engine running at different operating points (speed and torque levels) are analyzed for mean size determination using a laser-based three Wavelength Extinction Method (3-WEM). For this reason, collected soot samples are suspended using an appropriate sample preparation technique with optimized conditions of sonication as it revealed its effect on the soot mean particle size measured by 3-WEM. An online Scanning Mobility Particle Analyzer (SMPS) is also used to measure soot emission at identical engine operating points. Size values obtained from SNIPS are lower than those of suspended soot samples obtained from 3-WEM. The size discrepancies are mainly related to the required sample preparation procedure employed for 3-WEM measurements. The engine operating points affect, differently, the size measurements obtained from SNIPS and 3-WEM. Sedimentation Field-Flow Fractionation (SdFFF) is used for density determination of soot samples based on size measurements of fractions collected at peak maxima of fractograms using the off-line hyphenation with 3-WEM. It is assumed that a size dependent separation of soot particles occurred with a uniform particle density over the whole size distribution. An average density value is used for the conversion of soot fractograms to size distributions. Discrepancies are also found with size distribution profiles obtained from SMPS for the same engine operating points, due to the sample preparation procedure employed for SdFFF measurements.
机译：使用基于激光的三波长消光方法（3-WEM）分析了在不同工作点（速度和扭矩水平）运行的轻型（LD）大众柴油发动机排放的烟尘颗粒，以确定平均粒径。因此，使用合适的样品制备技术将收集的烟灰样品悬浮，并采用优化的超声处理条件，因为它显示出其对通过3-WEM测量的烟灰平均粒径的影响。在线扫描流动性颗粒分析仪（SMPS）也用于测量相同发动机工作点处的烟尘排放。从SNIPS获得的尺寸值低于从3-WEM获得的悬浮烟尘样品的尺寸值。尺寸差异主要与3-WEM测量所需的样品制备程序有关。发动机工作点会不同地影响从SNIPS和3-WEM获得的尺寸测量结果。沉降场流分馏（SdFFF）用于烟灰样品的密度测定，该测定基于使用3-WEM离线连字在分数图的最大峰值处收集的馏分的尺寸测量。假定在整个尺寸分布上以均匀的颗粒密度发生了烟灰颗粒的尺寸依赖性分离。将平均密度值用于将烟灰分形图转换为尺寸分布。由于用于SdFFF测量的样品制备程序，对于相同的发动机工作点，从SMPS获得的尺寸分布曲线也存在差异。

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