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Numerical investigation on flame blow-off limit of a novel microscale Swiss-roll combustor with a bluff-body

机译：新型带钝体的微型瑞士卷燃烧室火焰吹扫极限的数值研究

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A micro Swiss-roll combustor with a bluff-body was proposed for the first time. It is demonstrated that this improved design can greatly extend flame blow-off limit by reducing the flame stretch effect. The flame stabilization ability of this new combustor made of quartz, stainless steel (SS) and silicon carbide (SiC) was numerically investigated using a three dimensional, steady state, k-epsilon turbulence model. The results show that at an equivalence ratio of 0.5, the blow-off limits of quartz combustor, SS combustor and SiC combustor are 40 m/s, 50 m/s and 35 mks, respectively. Comprehensive analyses were conducted under an inlet velocity of 20 m/s. It was revealled that the heat loss rates for quartz, SS and SiC combustors were 153 W, 108 W and 185 W, respectively. The SS combustor has the best heat recirculation effect, followed by quartz combustor and SiC combustor. The lengths of recirculation zones are 4.35 mm, 3.4 mm and 3.37 mm for SiC combustor, quartz combustor and SS combustor, respectively. In summary, the heat loss rate is the chief factor responsible for the flame blow-off limit of this novel Swiss-roll combustor. It acts together with the heat-recirculation effect and flow-recirculation effect to determine the flame blow-off limit. (C) 2017 Elsevier Ltd. All rights reserved.
机译：首次提出了一种具有钝体的微型瑞士卷燃烧器。事实证明，这种改进的设计可以通过减小火焰拉伸效应来大大扩展火焰吹扫极限。使用三维，稳态，kε湍流模型对这种由石英，不锈钢（SS）和碳化硅（SiC）制成的新型燃烧器的火焰稳定能力进行了数值研究。结果表明，当量比为0.5时，石英燃烧器，SS燃烧器和SiC燃烧器的吹扫极限分别为40 m / s，50 m / s和35 mks。在20 m / s的入口速度下进行了综合分析。结果表明，石英，SS和SiC燃烧器的热损失率分别为153 W，108 W和185W。 SS燃烧器具有最佳的热循环效果，其次是石英燃烧器和SiC燃烧器。 SiC燃烧器，石英燃烧器和SS燃烧器的再循环区的长度分别为4.35mm，3.4mm和3.37mm。总而言之，热量损失率是决定这种新型瑞士辊式燃烧器火焰吹出极限的主要因素。它与热循环效应和流循环效应共同作用，确定火焰吹出极限。 （C）2017 Elsevier Ltd.保留所有权利。

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