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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers >Effects of combustor geometry on hydrogen-air premixed flame combustion in an annular microcombustor
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Effects of combustor geometry on hydrogen-air premixed flame combustion in an annular microcombustor

机译：燃烧器的几何形状对环形微型燃烧器中氢-空气预混火焰燃烧的影响

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摘要

Heat losses at the walls and heat release are two competitive rate processes in micro-combustion, and a microcombustor design must balance them appropriately for optimal performance. The primary objective of this work was to study the effects of some design variables on the processes influencing microcombustor characteristics and performance. A new compact and lightweight premixed hydrogen-air annular microcombustor was studied using a detailed computational fluid dynamics model validated against experimental data from literature. Heat reflux and flame stabilization were achieved by inserting a hollow tube in the combustion zone, which was also thermally isolated to reduce heat losses. It was found that the flame structure was insensitive to the thickness of inner tube, while wall temperature was not. On the other hand, a compact flame was obtained for larger aspect ratios, and wall temperature field did not alter significantly. Performance improved marginally with a higher thermal conductivity hollow tube. However, larger aspect ratio resulted in inferior thermal performance and non-isothermal walls. Thus, a configuration with smaller aspect ratio and thin-walled inner tube, possibly with a high thermal conductivity, was found to be desirable for good thermal performance. Finally, the model predictions indicated suitability of the design for intended applications.
机译：在微燃烧中，壁的热损失和热释放是两个竞争性的速率过程，微燃烧器的设计必须适当地平衡它们以获得最佳性能。这项工作的主要目的是研究一些设计变量对影响微型燃烧器特性和性能的过程的影响。使用详细的计算流体动力学模型对新的紧凑，轻巧的氢空气环形微燃烧器进行了研究，该模型针对文献中的实验数据进行了验证。通过在燃烧区中插入一根空心管来实现热回流和火焰稳定，该空心管也经过热隔离以减少热量损失。发现火焰结构对内管的厚度不敏感，而壁温则不敏感。另一方面，对于较大的纵横比，获得了紧凑的火焰，壁温场没有明显改变。更高导热率的空心管的性能略有提高。但是，较大的纵横比会导致较差的热性能和非等温壁。因此，发现对于良好的热性能而言，期望具有较小的纵横比和薄壁的内管，可能具有高的热导率。最后，模型预测表明该设计适合预期的应用。

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