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首页> 外文学位 >Autoignition of hydrogen and hydrogen-supplemented gaseous fuel mixtures under constant volume conditions.
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Autoignition of hydrogen and hydrogen-supplemented gaseous fuel mixtures under constant volume conditions.

机译：氢气和补充了氢气的气态燃料混合物在恒定体积条件下的自燃。

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摘要

The autoignition of H2-air, CO-H2-air, and CH 4-H2-air mixtures have been studied at constant volume conditions for a wide range of initial conditions. The spontaneous ignition characteristics have been examined numerically with a zero-dimensional model that incorporated detailed chemical kinetics and solved the corresponding species and energy conservation equations. The purpose of this work was to examine the dependence of the preignition reactions and ignition delay on various parameters such as initial temperature, initial pressure, equivalence ratio, diluent concentration, and heat transfer.;The ignition delay in H2-air mixtures was found to exhibit typical Arrhenius behavior for relatively high initial temperatures and low pressures. However, as the initial pressure is increased beyond a critical value for a specified initial temperature, the ignition delay significantly increases, primarily due to the chain-terminating reaction, H + O2 + M = HO2 + M. This reaction was found to have a similar decelerating effect on the combustion duration. Heat transfer and steam dilution significantly increased the ignition delay for initial pressures at which the radical scavenging of the recombination reactions began to significantly decelerate the rate of chain branching.;Hydrogen supplementation was found to significantly decrease the ignition delay in CO-air and CH4-air mixtures under most conditions, due to the enhanced radical production and chain-branching nature of the H 2-O2 sub-mechanism. The relative magnitude of the ignition delay in CH4-O2-CO2 mixtures compared to CH4-O2-N2 mixtures was found to depend strongly on the relative magnitudes of the terminating and chain branching reactions in the H2-O2 sub-mechanism.
机译：在各种初始条件下，均以恒定体积条件研究了H2空气，CO-H2空气和CH 4-H2空气混合物的自燃。用零维模型对自发点火特性进行了数值检查，该模型结合了详细的化学动力学，并解决了相应的物质和能量守恒方程。这项工作的目的是检查预点火反应和点火延迟对各种参数的依赖性，例如初始温度，初始压力，当量比，稀释剂浓度和传热。在较高的初始温度和较低的压力下表现出典型的Arrhenius行为。但是，当初始压力超过指定初始温度的临界值时，点火延迟显着增加，这主要是由于链终止反应H + O2 + M = HO2 +M。对燃烧持续时间有类似的减速作用。传热和蒸汽稀释显着增加了初始压力下的点火延迟，在该压力下，重组反应的自由基清除开始显着降低链支化速率。;发现添加氢气可显着降低CO空气和CH4中的点火延迟在大多数情况下，由于H 2-O2子机理的自由基产生和链支化性质的增强，空气混合物。与CH4-O2-N2混合物相比，CH4-O2-CO2混合物中点火延迟的相对大小在很大程度上取决于H2-O2子机理中终止和链支化反应的相对大小。

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  • 作者

    Thiessen, C. Scott.;

  • 作者单位

    University of Calgary (Canada).;

  • 授予单位 University of Calgary (Canada).;
  • 学科 Engineering Mechanical.
  • 学位 M.Sc.
  • 年度 2004
  • 页码 228 p.
  • 总页数 228
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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