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首页> 外文期刊>Fuel >Experimental investigation of flame stabilization inside the quarl of an oxyfuel swirl burner
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Experimental investigation of flame stabilization inside the quarl of an oxyfuel swirl burner

机译：氧燃料旋流燃烧器内的火焰稳定实验研究

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摘要

A more detailed understanding of coal combustion as required for predictive engineering is still lacking. To gain insights into physically relevant sub-processes the community follows a stepwise approach. Experiments have been conducted starting from lab-scale gas-assisted coal flames up to self-sustaining industrial-scale coal combustors in the MW-range. In the intermediate range, however, experiments are sparse. To close this gap in this contribution a new generic test rig is presented that is suitable for operating gas-assisted coal flames. In close similarity to a burner designed for oxycoal combustion the nozzle and quarl assembly exhibit most important characteristics of a state-of-the-art combustor. Quarl and combustion chamber provide excellent optical access such that advanced laser diagnostic methods can be applied for detailed studies of flow and scalar fields. Geometrical requirements for future numerical simulations such as easy meshing of the nozzle have been considered during the re-design of the burner. Although prepared for gas-assisted oxycoal firing, in a first step various gas flames operated in air and oxyfuel atmospheres are investigated here. The focus of the present study is on flame stabilization. The leading edge of the flame is located inside the quarl such that the optical access to this most important region is a mandatory requirement. For non-reacting and reacting conditions flow fields inside the quarl and the combustor are studied using stereoscopic particle image velocimetry (SPIV). To visualize reaction zones and flame stabilization regions planar laser induced fluorescence of the OH molecule (OH-PLIF) and broadband chemiluminescence (CL) measurements are performed for reacting conditions. It is observed that close to the nozzle the leading edge of the flame stabilizes as a diffusion flame in the slow moving shear layer located between the central recirculation zone and the fuel inlet. Further downstream the flame stabilizes in the high-momentum annular jet flow generated by the primary and secondary flow. Most probably it has switched to the premixed regime. (C) 2016 Elsevier Ltd. All rights reserved.
机译：仍然缺少对预测工程所需的燃煤的更详细的了解。为了深入了解与物理相关的子过程，社区遵循逐步的方法。已经进行了从实验室规模的气体辅助煤火焰到兆瓦级范围内的自持工业规模燃煤燃烧器的实验。但是，在中等范围内，实验很少。为了弥补这一差距，我们提出了一种适用于运行气体辅助煤焰的新型通用试验台。与为氧煤燃烧设计的燃烧器极为相似，喷嘴和夸克组件表现出最新燃烧器的最重要特征。石英和燃烧室提供了出色的光学通道，因此先进的激光诊断方法可用于流场和标量场的详细研究。在重新设计燃烧器时，已经考虑了对未来数值模拟的几何要求，例如喷嘴易于啮合。尽管已准备好用于气体辅助的氧化煤燃烧，但在第一步中，这里研究了在空气和含氧燃料气氛中运行的各种气体火焰。本研究的重点是火焰稳定。火焰的前缘位于燃烧室内部，因此必须强制进入该最重要区域。对于非反应和反应条件，使用立体粒子图像测速仪（SPIV）研究了在燃烧室和燃烧室内部的流场。为了可视化反应区和火焰稳定区，对反应条件进行了平面激光诱导的OH分子荧光（OH-PLIF）和宽带化学发光（CL）的测量。可以观察到，靠近喷嘴的火焰前缘在位于中央再循环区和燃料入口之间的慢速剪切层中作为扩散火焰稳定下来。在更下游，火焰稳定在由一次和二次流动产生的高动量环形射流中。它很可能已切换到预混体制。 （C）2016 Elsevier Ltd.保留所有权利。

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  • 来源
    《Fuel》 |2017年第1期|124-135|共12页
  • 作者

    Becker Lukas G.; Kosaka Hidemasa; Boehm Benjamin; Doost Samim; Knappstein Robert; Habermehl Martin; Kneer Reinhold; Janicka Johannes; Dreizler Andreas;

  • 作者单位

    Tech Univ Darmstadt, Inst React Flows & Diagnost, Jovanka Bontschits Str 2, D-64287 Darmstadt, Germany;

    Tech Univ Darmstadt, Inst React Flows & Diagnost, Jovanka Bontschits Str 2, D-64287 Darmstadt, Germany;

    Tech Univ Darmstadt, Inst Energy & Power Plant Technol, Jovanka Bontschits Str 2, D-64287 Darmstadt, Germany;

    Tech Univ Darmstadt, Inst Energy & Power Plant Technol, Jovanka Bontschits Str 2, D-64287 Darmstadt, Germany;

    Tech Univ Darmstadt, Inst Energy & Power Plant Technol, Jovanka Bontschits Str 2, D-64287 Darmstadt, Germany;

    Rhein Westfal TH Aachen, Inst Heat & Mass Transfer, Augustinerbach 6, D-52062 Aachen, Germany;

    Rhein Westfal TH Aachen, Inst Heat & Mass Transfer, Augustinerbach 6, D-52062 Aachen, Germany;

    Tech Univ Darmstadt, Inst Energy & Power Plant Technol, Jovanka Bontschits Str 2, D-64287 Darmstadt, Germany;

    Tech Univ Darmstadt, Inst React Flows & Diagnost, Jovanka Bontschits Str 2, D-64287 Darmstadt, Germany;

  • 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

    Partially-premixed swirl flame; PIV; OH-LIF; Oxyfuel; Flame stabilization; Coal;

    机译：部分预混旋流火焰;PIV;OH-LIF;含氧燃料;火焰稳定;煤;

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