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Turbulent burning velocity of methane-air-dust premixed flames

机译：甲烷-空气-粉尘预混火焰的湍流燃烧速度

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摘要

Investigation of turbulent burning velocity (S-T) of methane-air-dust premixed flames with different dust types (coal, sand and sodium bicarbonate) and dust concentrations (lambda(p) = 0-75 g/m(3)) were conducted at three methane-air pre-mixture equivalence ratios (phi(g)=0.8, 1.0 and 1.2) and different turbulent intensities (u'(rms) =0.65, 0.72 and 0.88 m/s). Experiments were conducted in a dust Bunsen burner set-up at constant pressure conditions to study stabilized premixed flames. The results indicate that based on the particle type, the variation of turbulent burning velocity with an increase in the particle concentration differs. In general, coal and sodium bicarbonate result in the heterogeneous effect of absorbing heat and releasing volatiles; whereas sand particles just absorb heat from the flame zone. The detailed time scale analysis conducted shows that the presence of particles in the concentration range considered tends to slightly enhance the cold flow turbulence whereas with the presence of flame zone, an increase in the turbulent intensity results in increasing the vaporization rate of the particles. This effects in decreasing the turbulent burning velocity of methane-air mixtures with coal and sodium bicarbonate particles at higher concentrations and turbulent intensities. Out of three dusts examined, sodium bicarbonate addition results in the lowest S-T due to the release of CO2 and H2O. Between coal and sand, at fuel lean and stoichiometric conditions, S-T values with coal are greater than sand due to the equivalence ratio promotion with the release of CH4. But, as the turbulent intensity increases and for phi(g)=1.0-1.2, S-T values with sand becomes comparable to or greater than that of coal. Model coefficients are generated from the experimental data to estimate the turbulent burning velocity in these conditions and the results show a clear distinction in the model coefficients for gaseous and gas-dust mixtures. (C) 2017 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
机译：研究了不同粉尘类型（煤，砂和碳酸氢钠）和粉尘浓度（lambda（p）= 0-75 g / m（3））的甲烷-空气-粉尘预混火焰的湍流燃烧速度（ST）。三个甲烷-空气预混合当量比（phi（g）= 0.8、1.0和1.2）和不同的湍流强度（u'（rms）= 0.65、0.72和0.88 m / s）。在恒压条件下的本生粉尘燃烧器装置中进行了实验，以研究稳定的预混火焰。结果表明，基于颗粒类型，湍流燃烧速度随颗粒浓度的增加而变化。通常，煤和碳酸氢钠会导致吸收热量和释放挥发物的异质性。而沙粒只是吸收火焰区域的热量。进行的详细时间尺度分析表明，在所考虑的浓度范围内，颗粒的存在会略微增强冷流湍流，而在存在火焰区的情况下，湍流强度的增加会导致颗粒的蒸发速率增加。这在较高浓度和湍流强度下降低了甲烷-空气混合物与煤和碳酸氢钠颗粒的湍流燃烧速度。在检查的三种粉尘中，由于释放出CO2和H2O，碳酸氢钠的添加导致最低的S-T。在煤和沙子之间，在稀燃和化学计量条件下，煤的S-T值大于沙子，这是因为当量比随CH4的释放而提高。但是，随着湍流强度的增加和phi（g）= 1.0-1.2，含沙的S-T值变得与煤相当或更高。从实验数据中生成模型系数，以估计在这些条件下的湍流燃烧速度，结果表明气态和气尘混合物的模型系数有明显区别。 （C）2017燃烧研究所。由Elsevier Inc.出版。保留所有权利。

著录项

  • 来源
    《Combustion and Flame》 |2018年第2期|367-375|共9页
  • 作者

    Ranganathan Sreenivasan; Petrow David; Rockwell Scott R.; Rangwala Ali S.;

  • 作者单位

    Worcester Polytech Inst, Dept Fire Protect Engn, 50 Prescott St,Gateway Pk 2, Worcester, MA 01609 USA;

    Eastern Kentucky Univ, Fire Protect & Paramed Sci, 521 Lancaster Ave, Richmond, KY 40475 USA;

    Univ North Carolina Charlotte, Depat Engn Technol & Construct Management, 9201 Univ City Blvd, Charlotte, NC 28223 USA;

    Worcester Polytech Inst, Dept Fire Protect Engn, 50 Prescott St,Gateway Pk 2, Worcester, MA 01609 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

    Premixed flame; Turbulent; Burning velocity; Dust Concentration; Particle; Coal;

    机译：预混火焰;湍流;燃烧速度;粉尘浓度;颗粒;煤;

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