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An experimental examination of the role of turbulence on flame impingement heat transfer

机译：对湍流作用对火焰冲击传热的实验检查

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摘要

Turbulence induced by actuators has been widely utilized as a effective means to enhance jet impingement heat transfer (JIHT). Flame impingement heat transfer (FIHT) has parital similarity to JIHT, and thus it is of interest to investigate the role of an actuator-induced turbulence to flame combustion as well as its FIHT. On a Bunsen burner that is incorporable with a ring-type turbulence actuator, a detailed experimental comparison of the flame appearance, reaction zone structure, thermal field and heat transfer of both laminar and turbulent flames under identical bulk flow conditions and equivalence ratios were conducted.Results show that the turbulent flame has a narrower stable-operation range than the laminar couterpart, and thus turbulence reduces the flame stability. A major difference between two flames exists at the reaction zone, which is identified to be a 'brush' structure in the turbulent case, instead of being a perfect cone in the laminar case. The flame brush changes the heat release behavior such that the temperature field of the turbulent flame shows lowered peak temperature while enlarged high-temperature zone. The changed heat release or temperature field reults in distinct local heat fluxes in the impinging flames at the stagnation region and near wall jet region. Consequently, the overall heat transfer rate of the turbulent flame becomes higher than the laminar flame. Accordingly, this study proposes that the actuator turbulence can be utilized as a useful technique to promote FIHT.
机译：致动器引起的湍流已被广泛用于增强喷射冲击热传递（JIHT）的有效手段。火焰冲击热传递（FIHT）与JIHT具有野性相似性，因此研究了致动器引起的湍流对火焰燃烧以及其FIHT的作用。在与环型湍流致动器中纳入的Bunsen燃烧器上，在相同的散装流动条件下进行了火焰外观，反应区结构，热场和层流和湍流火焰的热传热的详细实验比较。结果表明，湍流火焰的稳定运转范围比层状稳定性较窄，因此湍流降低了火焰稳定性。在反应区处存在两个火焰之间的主要差异，该反应区被识别为在湍流壳体中是“刷子”结构，而不是在层状壳体中成为完美的锥体。火焰刷改变热释放行为，使得湍流火焰的温度场显示出高温区域的峰值温度降低。在停滞区域和靠近壁射流区域的撞击火焰中发生变化的热释放或温度场在撞击火焰中的不同局部热通量。因此，湍流火焰的总传热速率变得高于层状火焰。因此，该研究提出致动器湍流可以用作促进FIHT的有用技术。

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  • 来源
    《Fuel》 |2020年第may15期|117329.1-117329.8|共8页
  • 作者

    Zhen H. S.; Zhang T. Y.; Wei Z. L.; Chen Z. B.; Huang Z. H.; Leung C. W.;

  • 作者单位

    Hainan Univ Mech & Elect Engn Coll Haikou Hainan Peoples R China;

    Hainan Univ Mech & Elect Engn Coll Haikou Hainan Peoples R China;

    Hainan Univ Mech & Elect Engn Coll Haikou Hainan Peoples R China;

    Hainan Univ Mech & Elect Engn Coll Haikou Hainan Peoples R China;

    Xi An Jiao Tong Univ State Key Lab Multiphase Flows Power Engn Xian 710049 Peoples R China;

    Hong Kong Polytech Univ Sch Profess Educ & Execut Dev Hung Hom Hong Kong Peoples R China;

  • 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

    Jet impingement heat transfer; Flame impingement heat transfer; Turbulence; Flame brush;

    机译：喷射冲击传热;火焰冲击传热;湍流;火焰刷;

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