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首页> 外文期刊>Fuel >Adiabatic laminar burning velocities of C_3H_8-O_2-CO_2 and C_3H_8-O_2-N_2 mixtures at ambient conditions-PART II: Mechanistic interpretation
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Adiabatic laminar burning velocities of C_3H_8-O_2-CO_2 and C_3H_8-O_2-N_2 mixtures at ambient conditions-PART II: Mechanistic interpretation

机译:C_3H_8-O_2-CO_2和C_3H_8-O_2-N_2在环境条件下的绝热层状燃烧速度 - 第二部分:机械解释

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摘要

The effect of diluents on the laminar burning velocity of the premixed C3H8-O-2-N-2 and C3H8-O-2-CO2 mixtures was numerically studied. Global flame parameters including adiabatic flame temperature (T-ad), overall reaction order (n), activation energy (E-a), Zeldovich number (Ze) and Lewis number (Le) were calculated. Results show that the N-2/CO2 alters all flame parameters. Based on asymptotic analysis for one-step overall reaction, these parameters correlates the laminar burning velocity. The change of Arrhenius effect, combination of thermal and chemical effect is the dominant factor, compared to the change of transport effect. Sensitivity analysis revealed that thermal effect is the dominant factor in Arrhenius effect. The correctness of one-step model was validated with experimental and numerical results. Detailed mechanism model analysis illustrates the linear correlations between laminar burning velocity and maximum (H + OH + O) concentration. The chemical effect of CO2 replacement of N2 in oxidizer is smaller than the thermal effect but much bigger than the transport effect in the calculation domain. The chemical effect of CO2 changes drastically with equivalence ratios and oxygen fractions.
机译:数值研究了稀释剂对预混合的C3H8-O-2-N-2和C3H8-O-2-2-CO2混合物的层状燃烧速度的影响。计算包括绝热火焰温度(T-Ad),总反应顺序(N),活化能量(E-A),塞尔多维奇数(ZE)和lewis数(Lewis数(Le)的全局火焰参数。结果表明,N-2 / CO2改变了所有火焰参数。基于一步整体反应的渐近分析,这些参数将层流燃烧速度相关联。阿列希乌斯效应的变化,热和化学效果的组合是主导因素,与运输效果的变化相比。敏感性分析显示,热效应是Arrhenius效应的主导因素。用实验和数值结果验证了一步模型的正确性。具体的机制模型分析说明了层流燃烧速度和最大(H + OH + O)浓度之间的线性相关性。 CO2在氧化剂中更换N2的CO 2的化学效果小于热效应,但比计算结构域中的运输效果大得多。 CO2的化学效果随着等效比和氧级分的急剧变化。

著录项

  • 来源
    《Fuel》 |2020年第15期|117946.1-117946.15|共15页
  • 作者单位

    Zhejiang Univ State Key Lab Clean Energy Utilizat Hangzhou 310027 Peoples R China;

    Zhejiang Univ State Key Lab Clean Energy Utilizat Hangzhou 310027 Peoples R China;

    Zhejiang Univ State Key Lab Clean Energy Utilizat Hangzhou 310027 Peoples R China;

    Zhejiang Univ State Key Lab Clean Energy Utilizat Hangzhou 310027 Peoples R China;

    Zhejiang Univ State Key Lab Clean Energy Utilizat Hangzhou 310027 Peoples R China;

    Zhejiang Univ State Key Lab Clean Energy Utilizat Hangzhou 310027 Peoples R China;

  • 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

    Laminar burning velocity; One-step overall reaction; Dilution; Chemical effect; MILD combustion; Oxy-fuel combustion;

    机译:层流燃烧速度;一步的整体反应;稀释;化学效果;轻度燃烧;氧燃料燃烧;

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