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首页> 外文期刊>International journal of hydrogen energy >Micro-combustor performance enhancement by hydrogen addition in a combined baffle-bluff configuration
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Micro-combustor performance enhancement by hydrogen addition in a combined baffle-bluff configuration

机译：通过组合挡板和钝气配置增加氢气来提高微燃烧器性能

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The size limitation of micro-combustors leads to insufficient residence times, flame instabilities, and intensified heat losses which are main challenges that scientists have always faced with. To come up with solutions to these challenges, the effects of hydrogen addition to the premixed methane-air mixture in a recently designed Micro-Thermo-Photo-Voltaic (MTPV) combustor with parallel baffles and cylindrical bluffs are investigated numerically. It is concluded that the fuel blend with 70% hydrogen and 30% methane could improve the average wall temperature, temperature uniformity, and combustion efficiency by 60 K, 73%, and 4.5%, respectively. In addition, the best hydrogen fraction in the fuel blend is independent of the baffle thickness, as the most important geometrical parameter, but increases with the increase in the energy input (mass flow rate) to the combustor. The physical analyses revealed that the proximity of the flame front to the combustor inlet and the high curvature of the flame surface are the reasons underlying the superior performance of the optimal fuel blend. Furthermore, the hydrogen enrichment could reduce the pressure drop inside the combustor by reducing the size of the separation region behind the bluff-bodies. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
机译：微型燃烧器的尺寸限制导致停留时间不足，火焰不稳定和热量损失增加，这是科学家一直面临的主要挑战。为了提出这些挑战的解决方案，在最近设计的带有平行挡板和圆柱形隔板的微型热光伏打（MTPV）燃烧器中，对预混合的甲烷-空气混合物中加氢的影响进行了数值研究。结论是，将燃料与70％的氢和30％的甲烷混合可分别将平均壁温，温度均匀性和燃烧效率分别提高60 K，73％和4.5％。另外，作为最重要的几何参数，燃料混合物中的最佳氢分数与挡板厚度无关，但是随着向燃烧器的能量输入（质量流量）的增加而增加。物理分析表明，火焰前沿与燃烧室入口的接近以及火焰表面的高曲率是导致最佳燃料混合物优异性能的原因。此外，富氢可以通过减小钝体后面的分离区域的尺寸来减小燃烧器内部的压降。 （C）2018氢能出版物有限公司。由Elsevier Ltd.出版。保留所有权利。

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