...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Combustion and Flame >Self-tuning and topological transitions in a free-falling nanofuel droplet flame
【24h】

Self-tuning and topological transitions in a free-falling nanofuel droplet flame

机译：自由落下的纳诺液滴火焰中的自我调整和拓扑过渡

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In the present study, flame dynamics of free-falling contactless burning fuel droplets (pure and nanofuel) is investigated. A droplet under free fall undergoes acceleration resulting in progressive increase of its ve locity (increase in Reynolds Number, Re) along the path. The consequent dynamic external relative flow induced along the drop trajectory allows self-tuning of the flame through a series of transitions. At low Re, the droplet flame transitions from an initial fully enveloped buoyant diffusion flame to a premixed wake flame structure. It is shown that this transition occurs due to flame extinction at the droplet forward stagnation point when critical strain rate is exceeded due to the external flow. Subsequently the wake flame topology undergoes significant variations with further increase in Reynolds number. The flow conditions necessary for wake-flame stabilization are characterized. Using a round-jet analogy, a linear relationship between the flame height and Reynolds number is established which shows that topological transitions are predominantly hydrodynamic in nature. Droplet burning rate for all functional droplets exhibits minimal change due to reduced energy input from the wake flame. However, for nanofuel droplets, the global heat release is lowered due to the reduction in gasification rate brought about by the insitu formation of porous structure by the agglomeration of nanoparticles. Furthermore, for particle laden droplets, absence of sufficient energy input from the flame suppresses internal heterogeneous boiling as found in most pendant droplet experiments. (c) 2020 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
机译：在本研究中，研究了无坠落非接触式燃烧燃料液滴（纯和纳芬纽）的火焰动态。自由落体下的液滴经历加速，导致其VE位置的逐步增加（沿路径增加雷诺数，RE）。沿着下降轨迹引起的随之而来的动态外部相对流动允许通过一系列转变自调整火焰。在低RE时，液滴火焰从初始完全包络的浮力扩散火焰转换到预混合的唤醒火焰结构。结果表明，当由于外部流动超过临界应变速率时，由于外部临界应变速率而发生火焰灭火发生。随后，随后唤醒火焰拓扑经历了显着的变化，进一步增加了雷诺数。表征了唤醒火焰稳定所需的流动条件。使用圆形喷射类比，建立火焰高度和雷诺数之间的线性关系，其表明拓扑过渡主要是自然的流体动力学。由于唤醒火焰的能量减少，所有功能液滴的液滴燃烧率显示出最小的变化。然而，对于纳税液滴，由于纳米颗粒的附聚，因此通过内部结构的气化率降低，全局热释放因子。此外，对于粒子载液滴，在大多数侧液滴实验中发现，缺乏来自火焰的足够的能量输入抑制内部异质沸腾。 （c）2020燃烧研究所。由elsevier Inc.出版的所有权利保留。

著录项

  • 来源
    《Combustion and Flame》 |2020年第10期|144-156|共13页
  • 作者

    Pandey Khushboo; Basu Saptarshi; Gautham V; Potnis Aditya; Chattopadhyay Kamanio;

  • 作者单位

    Indian Inst Sci Interdisciplinary Ctr Energy Res ICER Bangalore 560012 Karnataka India;

    Indian Inst Sci Interdisciplinary Ctr Energy Res ICER Bangalore 560012 Karnataka India|Indian Inst Sci Dept Mech Engn Bangalore 560012 Karnataka India;

    Indian Inst Sci Dept Mech Engn Bangalore 560012 Karnataka India;

    Indian Inst Sci Dept Mech Engn Bangalore 560012 Karnataka India|Univ Calif San Diego Dept Mech & Aerosp Engn San Diego CA 92103 USA;

    Indian Inst Sci Interdisciplinary Ctr Energy Res ICER Bangalore 560012 Karnataka India|Indian Inst Sci Dept Mat Engn Bangalore 560012 Karnataka India;

  • 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

    Droplet combustion; Recirculation; Wake flame; Flame strain; Nanofuels; Free-falling droplet;

    机译：液滴燃烧;再循环;唤醒火焰;火焰菌株;纳箔;自由坠落液滴;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号