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首页> 外文期刊>International journal of hydrogen energy >Numerical comparison of premixed H_2/air combustion characteristic of three types of micro cavity-combustors with guide vanes, bluff body, guide vanes and bluff body respectively
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Numerical comparison of premixed H_2/air combustion characteristic of three types of micro cavity-combustors with guide vanes, bluff body, guide vanes and bluff body respectively

机译：三种微腔 - 燃烧器的预混H_2 /空气燃烧特性分别具有引导叶片，诈锐体，引导叶片和虚张机体的预混H_2 /空气燃烧特性

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摘要

Micro-scale combustion is facing the problems of ignition difficulty, combustion instability, and low combustion efficiency. Therefore, it is necessary to improve the combustion characteristics in micro-combustor to expand the application range of micro-combustor. Focusing on the problem of the weak preheating effect of the micro cavity-combustor, the guide vanes are constructed to enhance the combustion near the cavity, and further combine with the bluff body to enhance combustion. The combustion characteristics of three types of cavity combustors with guide vanes (CCGV), bluff body (CCBB), bluff body, and guide vanes (CCGB) respectively are compared and analyzed under different inlet velocities (8-32 m/s), equivalence ratios (0.6-1.4), and wall materials (quartz glass, steel, and SiC). Results show that the guide vanes can greatly improve the combustion intensity near the cavity and improve the combustion stability of the cavity combustor. The combustion efficiency of CCGV and CCGB are increased by 43.04% and 85.96% respectively than CCBB when the inlet velocity is 32 m/s. The reaction heat of CCGV is 244.5 W when inlet velocity is 32 m/s, which is 0.55 times and 1.57 times that of CCGV and CCBB, respectively. The temperature uniformity and mean temperature of the outer wall of CCGV and CCGB both are better than that of CCGB. The combustion efficiency of CCGB is the highest among three combustors under the same equivalence ratio, especially when the equivalence ratio is less than 1. The reaction intensity in the cavity of the CCGV and CCGB with steel wall materialis highest than that of the combustor with the other two wall materials. Wall materials with high thermal conductivity have a better preheating effect. Compared with quartz as the wall material, the mean temperature of the external wall of CCGV and CCGB using steel and silicon carbide as the wall material both increase by more than 130 K, and the wall heat loss both increase by more than 50%. (c) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
机译：微级燃烧面临着点火困难，燃烧不稳定和低燃烧效率的问题。因此，有必要改善微燃烧器中的燃烧特性，以扩大微燃烧器的应用范围。专注于微腔 - 燃烧器的弱预热效果的问题，构造引导叶片以增强腔附近的燃烧，并进一步与虚B体组合以增强燃烧。在不同的入口速度（8-32米/秒）下，分别比较具有引导叶片（CCGV），诈盲体（CCBB），凹槽，凹槽体和导叶（CCGB）的三种类型腔燃烧器的燃烧特性，并分析（8-32米/秒），等价比率（0.6-1.4）和墙壁材料（石英玻璃，钢和SiC）。结果表明，导叶可以大大提高腔附近的燃烧强度，提高腔燃烧器的燃烧稳定性。当入口速度为32米/秒时，CCGV和CCGB的燃烧效率分别比CCBB增加了43.04％和85.96％。入口速度为32米/秒，CCGV的反应热量分别为244.5W，分别为CCGV和CCBB的0.55倍和1.57倍。 CCGV和CCGB外壁的温度均匀性和平均温度均优于CCGB。 CCGB的燃烧效率在相同的等效比下的三个燃烧器中最高，特别是当等效率小于1. CCGV和CCGB的腔体中的反应强度与钢壁物质的最高比燃烧器其他两墙材料。具有高导热性的壁材料具有更好的预热效果。与石英作为壁材料相比，CCGV和CCGB外壁的平均温度使用钢和碳化硅作为壁材料均增加130 k，壁热损失均增加50％以上。 （c）2021氢能出版物LLC。 elsevier有限公司出版。保留所有权利。

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  • 来源
    《International journal of hydrogen energy》 |2021年第47期|24382-24394|共13页
  • 作者

    Gao Wei; Yan Yunfei; Huang Lujing; Shen Kaiming; He Ziqiang; Gao Bo;

  • 作者单位

    Chongqing Univ Key Lab Low Grade Energy Utilizat Technol & Syst Minist Educ Chongqing 400030 Peoples R China;

    Chongqing Univ Key Lab Low Grade Energy Utilizat Technol & Syst Minist Educ Chongqing 400030 Peoples R China;

    Chinese Acad Sci Inst Engn Thermophys Beijing 100190 Peoples R China;

    Chongqing Univ Key Lab Low Grade Energy Utilizat Technol & Syst Minist Educ Chongqing 400030 Peoples R China;

    Chongqing Univ Key Lab Low Grade Energy Utilizat Technol & Syst Minist Educ Chongqing 400030 Peoples R China;

    Harbin Engn Univ Coll Power & Energy Engn Harbin 150001 Peoples R China;

  • 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

    Cavity combustor; Guide vanes; Bluff body; Combustion efficiency; Combustion stability;

    机译：腔燃烧器;导叶;虚张机体;燃烧效率;燃烧稳定性;

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