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首页> 外文会议>ASME Turbo Expo: Turbomachinery Technical Conference and Exposition >NUMERICAL STUDY OF THERMAL PERFORMANCE AND NOX EMISSION FOR AN AMMONIA-FUELLED MICRO-COMBUSTOR WITH RING-SHAPED RIBS IN LEAN COMBUSTION
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NUMERICAL STUDY OF THERMAL PERFORMANCE AND NOX EMISSION FOR AN AMMONIA-FUELLED MICRO-COMBUSTOR WITH RING-SHAPED RIBS IN LEAN COMBUSTION

机译：瘦燃烧中环形肋的氨燃料微燃烧器热性能和NOx排放的数值研究

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摘要

As a renewable energy source, ammonia is regarded as one of the ideal gases that can replace fossil fuels and has been extensively studied in large-scale combustion. However, studies on energy conversion efficiency and NOx emission in microscale are still inadequate. In this work, ammonia/oxygen premixed cylindrical micro-combustors with inner ribs under condition of lean combustion is numerically investigated. The key geometrical parameters of the ribs and the ammonia oxygen equivalence ratio are evaluated based on thermal performance and NOx emission performance. Finally, the sensitivity analysis of NO and related reaction pathways are analyzed under different equivalence ratios. The results show that increasing the height of the rib and decreasing the distance between the first rib and the inlet can effectively inhibit the generation of NO. Among all cases, the combustor with U-shaped ribs is observed the minimum mole fraction of NO at the outlet under the same working condition, which is 16% less comparing to the rectangular-shaped one. Besides, the mean wall temperature shows a weak correlation with NO emission. Increasing the equivalence ratio can help gain higher mean wall temperature, but at the same time promotes NOx production. This study is helpful to the design and improvement of micro-combustors fuelled by ammonia.
机译：作为可再生能源，氨被认为是可以取代化石燃料的理想气体之一，并且在大规模燃烧中被广泛地研究。然而，微观尺寸能量转换效率和NOx排放的研究仍然不足。在这项工作中，在数值上研究了具有内肋的内肋的氨/氧气预混圆柱形微燃烧器。基于热性能和NOx排放性能评估肋骨和氨氧等效比的关键几何参数。最后，在不同的等效比下分析了NO和相关反应途径的敏感性分析。结果表明，增加肋骨的高度并减小第一肋骨和入口之间的距离可以有效地抑制不产生的产生。在所有情况下，与U形肋骨的燃烧器在相同的工作条件下观察到在出口下的最小摩尔分数，这比与矩形形状相比减少16％。此外，平均壁温表现出与没有发射的弱相关性。增加等效率可以有助于获得更高的平均壁温，但同时促进NOx生产。本研究有助于设计和改进由氨推动的微燃烧器。

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