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The effect of jet mixing on the combustion efficiency of a hot, fuel-rich cross-flow.

机译：射流混合对热的，燃料丰富的横流燃烧效率的影响。

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摘要

Many combustion systems inject air into a hot fuel-rich cross-flow to minimize carbon monoxide and unburned hydrocarbon emissions. Examples include staged air injection in fluidized bed combustors, gas turbine engines, and electric arc furnace exhaust afterburners. Low CO and unburnt hydrocarbon emissions are important design objectives. Efforts in modeling combustion have failed in accurately predicting the levels of these emissions. The main aim of this study is to improve our understanding of the relationship between mixing, chemical kinetics, and combustion efficiency for air jets in a hot reacting cross-flow.; Carbon monoxide and hydrogen concentration measurements have been made for six different round jet configurations issuing air into a hot reacting cross-flow. The study of the performance of four different 9 round jets modules having different jet diameters indicated that the overall equivalence ratio has a significant effect on the maximum combustion efficiency. An equivalence ratio of approximately 0.8 leads to the best combustion efficiency for all of the 9 round jet modules. This result is similar to what is observed in premixed combustion. The predominance of the effect of the equivalence ratio suggests that some premixing between the jets and the cross-flow takes place prior to combustion. The rest of the experiments were run such that the optimum mixing (according to cold flow theory) occurs at Φ = 0.8. The experiments also showed that, although the equivalence ratio does not control the location of the optimum point, it does affect the level of emissions. In fact, at constant equivalence ratio, low momentum flux ratios yield higher emissions. The number of jets affects the level of emissions. Larger number of jets provided better combustion efficiency. The unmixedness was measured for the 18 round jets module. This measurement showed the momentum flux ratio is a driving factor affecting mixing. The comparison of the combustion efficiency of H2 and CO suggest that the reaction rate affect the level of combustion efficiency without affecting the location of the optimum.
机译：许多燃烧系统将空气注入富含燃料的热交叉流中，以最大程度地减少一氧化碳和未燃烧的碳氢化合物的排放。示例包括在流化床燃烧器，燃气轮机和电弧炉排气加力燃烧器中分阶段进行空气注入。低CO和未燃烧的碳氢化合物排放是重要的设计目标。对燃烧进行建模的努力未能准确预测这些排放的水平。这项研究的主要目的是增进我们对热反应横流中空气喷射的混合，化学动力学和燃烧效率之间关系的理解。已经对六种不同的圆形喷射配置进行了一氧化碳和氢气浓度测量，这些配置将空气排放到热的反应横流中。对具有不同射流直径的四个9个圆形射流模块的性能的研究表明，总当量比对最大燃烧效率有重要影响。当量比约为0.8时，所有9个圆形喷射模块的燃烧效率最佳。该结果类似于在预混燃烧中观察到的结果。当量比的影响主要表明，在燃烧之前，射流和错流之间发生了一些预混合。运行其余的实验，以使最佳混合（根据冷流理论）在Φ= 0.8时发生。实验还表明，尽管当量比不能控制最佳点的位置，但它确实会影响排放水平。实际上，在等价比恒定的情况下，低动量通量比会产生更高的排放。喷嘴的数量会影响排放水平。喷嘴数量越多，燃烧效率越高。测量了18个圆形喷嘴模块的未混合度。该测量表明，动量通量比是影响混合的驱动因素。 H 2 和CO的燃烧效率的比较表明，反应速率影响燃烧效率的水平而不影响最佳位置。

著录项

  • 作者

    Boutazakhti, Mohamed.;

  • 作者单位

    University of Toronto (Canada).;

  • 授予单位 University of Toronto (Canada).;
  • 学科 Engineering Mechanical.
  • 学位 M.A.Sc.
  • 年度 2000
  • 页码 113 p.
  • 总页数 113
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;
  • 关键词

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