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Droplet combustion in the presence of acoustic excitation

机译:声激发下的液滴燃烧

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摘要

This experimental study focused on droplet combustion characteristics for various liquid fuels during exposure to external acoustical perturbations generated within an acoustic waveguide. The alternative liquid fuels include alcohols, aviation fuel (JP-8). and liquid synthetic fuel derived via the Fischer-Tropsch process. The study examined combustion during excitation conditions in which the droplet was situated in the vicinity of a pressure node (PN). In response to such acoustic excitation, the flame surrounding the droplet was observed to be deflected, on average, with an orientation depending on the droplet's relative position with respect to the PN. Flame orientation was always found to be consistent with the sign of a theoretical bulk acoustic acceleration, analogous to a gravitational acceleration, acting on the burning system. Yet experimentally measured acoustic accelerations based on mean flame deflection differed quantitatively from that predicted by the theory. Phase-locked OH~* chemiluminescence imaging revealed temporal oscillations in flame standoff distance from the droplet as well as chemiluminescent intensity; these oscillations were especially pronounced when the droplets were situated close to the PN. Simultaneous imaging and pressure measurements enabled quantification of combustion-acoustic coupling via the Rayleigh index, and hence a more detailed understanding of dynamical phenomena associated with acoustically coupled condensed phase combustion processes.
机译:这项实验研究的重点是在暴露于声波导管内产生的外部声波扰动期间,各种液体燃料的液滴燃烧特性。替代液体燃料包括酒精,航空燃料(JP-8)。以及通过费-托工艺获得的液态合成燃料。这项研究检查了在激发条件下的燃烧,其中液滴位于压力节点(PN)附近。响应于这种声激发,观察到围绕液滴的火焰平均偏转的方向取决于液滴相对于PN的相对位置。人们总是发现火焰取向与作用在燃烧系统上的理论体声加速度的符号一致,类似于重力加速度。然而,基于平均火焰挠度的实验测得的声加速度与理论预测的值在数量上有所不同。锁相OH〜*化学发光成像显示火焰与液滴的距离和化学发光强度之间存在时间振荡。当液滴靠近PN时,这些振荡尤为明显。同时进行成像和压力测量,可以通过瑞利指数对燃烧声耦合进行量化,因此可以更详细地了解与声耦合凝聚相燃烧过程相关的动力学现象。

著录项

  • 来源
    《Combustion and Flame》 |2014年第6期|1604-1619|共16页
  • 作者单位

    Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, CA 90095-1597, USA;

    Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, CA 90095-1597, USA;

    Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, CA 90095-1597, USA;

    Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, CA 90095-1597, USA;

    Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, CA 90095-1597, USA;

    Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, CA 90095-1597, USA,Department of Mechanical and Aerospace Engineering, 46-147K Engineering Ⅳ, UCLA, Los Angeles, CA 90095-1597, USA;

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

    Acoustically-coupled combustion; Droplet combustion;

    机译:声耦合燃烧;液滴燃烧;

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