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首页> 外文期刊>JSME International Journal. Series B, Fluids and Thermal Engineering >Numerical Investigation of Edge Flame Structure of Counterflow Nonpremixed Flames with Local Extinction Due to Flame Stretch
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Numerical Investigation of Edge Flame Structure of Counterflow Nonpremixed Flames with Local Extinction Due to Flame Stretch

机译：火焰拉伸引起的局部熄灭逆流非预混火焰边缘火焰结构的数值研究

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摘要

Laminar counterflow nonpremixed flames with local extinction caused by nonuniform inflows are numerically investigated in two-dimensions in a system governed by Lewis numbers of unity and assuming a single-step, irreversible, finite-rate reaction. A numerical method based on the SIMPLE algorithm is used. Edge flame structures are investigated through the introduction of a new progress variable defined as the normalized integral of the mass fraction of a product in the mixture fraction Z space and which expresses the progress of the chemical reaction. Calculation results reveal that the edge flame structure can be classified into three regions; fully burning flame, weakened flame with a low reaction rate, and a non-reacting preheat region. Under these conditions, and in terms of the energy balance, the edge flame structure is dependent on the Z-directional heat diffusion transport, heat consumption (given by the progress variable), and heat production by chemical reaction. It is found that each type of flame structure can be well characterized by three parameters; the mixture fraction, the stoichiometric scalar dissipation rate, and the progress variable. These three parameters are identified as important factors affecting the edge flame structure of nonpremixed flames with local extinction.
机译：在由Lewis单位为单位的Lewis数控制的系统中，以二维方式对层流逆流非均匀混合火焰（由不均匀的流动引起的局部熄灭）进行了数值研究，并假设其为单步不可逆的有限速率反应。使用基于SIMPLE算法的数值方法。通过引入新的进展变量来研究边缘火焰结构，新的进展变量定义为混合物分数Z空间中产品的质量分数的归一化积分，它表示化学反应的进展。计算结果表明，边缘火焰结构可分为三个区域。完全燃烧的火焰，减弱的火焰，低的反应速率以及无反应的预热区域。在这些条件下，就能量平衡而言，边缘火焰结构取决于Z方向的热扩散传输，热量消耗（由进度变量确定）和化学反应产生的热量。发现每种类型的火焰结构可以通过三个参数很好地表征。混合分数，化学计量的标量耗散率和进度变量。这三个参数被确定为影响局部熄灭的非预混火焰的边缘火焰结构的重要因素。

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