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Air assisted atomization and spray density characterization of ethanol and a range of biodiesels

机译：乙醇和一系列生物柴油的空气辅助雾化和喷雾密度表征

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摘要

Phase Doppler/Iaser Doppler anemometry (PDA/LDA) and microscopic high speed imaging have been applied to an air assisted spray using three different biodiesels (fatty acid methyl esters of short, medium and long chain length) and ethanol. The momentum decay and droplet size characteristics of the four fuels have been compared as a function of Reynolds number, mass loading, and radial position for a number of downstream locations. The PDA/LDA results suggest that the spray characteristics are very similar past x/D = 5 showing that the majority of break-up occurs in the near exit plane region, with minimal secondary atomization occurring further downstream. Microscopic high speed imaging has revealed qualitative information on the breakup structure as a function of physical properties and downstream locations showing significantly different atomization behaviour at the exit plane. An automated image processing technique has been applied to calculate the liquid blockage area as a measure of the spray density and degree of atomization. The technique has revealed the dependence of liquid blockage area on the fuel physical properties, showing that the long chain length biodiesel has more unbroken liquid at the exit plane. Furthermore, a manual processing method has been used to provide detailed statistical information on the probability of occurence of shapes such as long ligaments, short ligaments, unbroken liquid volumes, and deformed droplets appearing in the spray. The probability of a long ligament appearing in the long chain biodiesel is much higher while ethanol and the short chain biodiesel have yielded very similar results. In addition to revealing information on the atomization characteristics of these biodiesels, the two image processing techniques suggest a simple and alternative way of characterizing atomizing sprays.
机译：使用三种不同的生物柴油（短，中和长链长的脂肪酸甲酯）和乙醇，将相位多普勒/红外多普勒风速计（PDA / LDA）和显微高速成像技术应用于空气辅助喷雾。比较了四种燃料的动量衰减和液滴尺寸特性，它们是雷诺数，质量载荷和许多下游位置的径向位置的函数。 PDA / LDA结果表明，在x / D = 5以后，喷雾特性非常相似，表明大部分破裂发生在近出口平面区域，而最小的二次雾化发生在下游。微观高速成像已经揭示了作为物理性能和下游位置的函数的分解结构的定性信息，这些位置在出口平面处显示出明显不同的雾化行为。已应用自动图像处理技术来计算液体阻塞面积，以作为喷雾密度和雾化度的量度。该技术揭示了液体阻塞面积对燃料物理性能的依赖性，表明长链生物柴油在出口平面处具有更多的未破损液体。此外，已经使用手动处理方法来提供关于出现形状的可能性的详细统计信息，所述形状例如长韧带，短韧带，未破裂的液体体积以及在喷雾中出现的变形的液滴。在长链生物柴油中出现长韧带的可能性要高得多，而乙醇和短链生物柴油产生的结果非常相似。除了揭示有关这些生物柴油雾化特性的信息外，这两种图像处理技术还提出了一种表征雾化喷雾的简单替代方法。

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  • 来源
    《Fuel》 |2013年第6期|758-770|共13页
  • 作者

    A. Kourmatzis; P.X. Pham; A.R. Masri;

  • 作者单位

    Clean Combustion Research Croup, Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, NSW 2006, Australia;

    Clean Combustion Research Croup, Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, NSW 2006, Australia;

    Clean Combustion Research Croup, Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, NSW 2006, Australia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    biodiesel atomization; spray dynamics; shadowgraphy; image processing;

    机译：生物柴油雾化喷雾动力学皮影图像处理;

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