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首页> 外文期刊>Combustion and Flame >Effects of strain rate, turbulence, reactant stoichiometry and heat losses on the interaction of turbulent premixed flames with stoichiometric counterflowing combustion products
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Effects of strain rate, turbulence, reactant stoichiometry and heat losses on the interaction of turbulent premixed flames with stoichiometric counterflowing combustion products

机译：应变率，湍流，反应物化学计量和热损失对湍流预混火焰与化学计量逆流燃烧产物相互作用的影响

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摘要

Intense strain, turbulence, heat transfer, and mixing with combustion products can affect premixed flames in practical combustion devices. These effects are systematically studied in turbulent premixed CH_4/N2/O_2 flames using a reactant versus product counterflow system and independently varying bulk strain rate, turbulent Reynolds number, equivalence ratio of the reactant mixture, and temperature of the stoichiometric counterflowing combustion products. The flow field and the turbulent flames are investigated using particle image velocimetry (PIV) measurements and laser-induced fluorescence (LIF) imaging of OH. The OH-LIF images are used to identify the interface between the counterflowing streams, referred to here as the gas mixing layer interface (GMLI). The flame response for different flow conditions is compared in terms of the probability of localized extinction along the GMLI, the turbulent flame brush thickness, and flame position relative to the GMLI, by using an OH-LIF-based progress variable. The probability of localized extinction at the GMLI increases as the separation between the turbulent flame brush and the GMLI decreases. Flame fronts in the vicinity of the GMLI are more likely to extinguish as a result of heat losses, dilution of the reaction zone by the product stream, and large local strain rates. A higher probability of localized extinction at the GMLI is induced by either a larger bulk strain rate or a slower flame speed. As the turbulent Reynolds number increases, the corresponding increase in turbulent flame brush thickness enhances the interactions of the flame fronts with the GMLI. Heat losses are substantially less significant for cases in which the turbulent flame brush is sufficiently separated from the GMLI. For flames in close proximity to the GMLI, the effects of the product stream on the flame front differ for lean and rich reactant mixtures. These disparities are attributed in part to differences in the ignitibility of the reactant mixtures by the hot product stream.
机译：强烈的应变，湍流，热传递以及与燃烧产物的混合会影响实际燃烧设备中的预混火焰。使用反应物对产品逆流系统，在湍流预混CH_4 / N2 / O_2湍流火焰中系统地研究了这些影响，并独立地改变了总应变率，湍流雷诺数，反应物混合物的当量比和化学计量逆流燃烧产物的温度。使用粒子图像测速（PIV）测量和OH的激光诱导荧光（LIF）成像研究了流场和湍流火焰。 OH-LIF图像用于识别逆流之间的界面，在此称为气体混合层界面（GMLI）。通过使用基于OH-LIF的进度变量，根据沿GMLI的局部熄灭概率，湍流的火焰刷厚度以及相对于GMLI的火焰位置，比较了不同流动条件下的火焰响应。随着湍流火焰刷和GMLI之间的距离减小，GMLI处局部灭绝的可能性增加。由于热损失，产物流对反应区的稀释以及较大的局部应变率，GMLI附近的火焰前沿更可能熄灭。较大的整体应变速率或较慢的火焰速度会导致GMLI发生局部灭绝的可能性较高。随着湍流雷诺数的增加，湍流火焰刷厚度的相应增加会增强火焰前沿与GMLI的相互作用。对于湍流火焰刷与GMLI充分分离的情况，热损失的重要性不大。对于紧邻GMLI的火焰，对于稀薄和浓的反应混合物，产物流对火焰前沿的影响是不同的。这些差异部分归因于热产物流在反应混合物的可燃性方面的差异。

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  • 来源
    《Combustion and Flame》 |2013年第11期|2442-2456|共15页
  • 作者

    Bruno Coriton; Jonathan H. Frank; Alessandro Gomez;

  • 作者单位

    Combustion Research Facility, Sandia National Laboratories, Livermore, CA 94551, USA;

    Combustion Research Facility, Sandia National Laboratories, Livermore, CA 94551, USA;

    Yale Center for Combustion Studies, Department of Mechanical Engineering and Materials Science, Yale University, New Haven, CT 06520-8286, 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

    Turbulent premixed flames; Extinction; Ignition; Counterflow; Strain rate; Heat loss;

    机译：湍流的预混火焰;灭绝;点火;逆流;应变率;热损失;

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