Outwardly growing premixed flames in turbulent media
Outwardly growing premixed flames in turbulent media
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湍流介质中向外生长的预混合火焰
DOI：
10.1016/j.combustflame.2021.111816
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发表时间：
2022
影响因子：
4.4
通讯作者：
Matalon, Moshe
中科院分区：
文献类型：
--
作者：
Mohan, Shikhar;Matalon, Moshe
在流体动力学理论的背景下，其中的火焰，作为一个表面的密度不连续分离新鲜的可燃混合物从燃烧产品，向外扩展的预混火焰的传播进行了检查，传播速度取决于当地的几何形状和混合物/流动特性。一个嵌入式流形的方法，一个善于处理多值和脱节的表面，经常观察到在真实的火焰，被用来耦合流动和火焰的演变。的敏感性分析，不同的Markstein数的混合物的基础上，进行调查的早期火焰核心的发展，除了其长期的演变。重点是了解湍流特性的影响，区分速度波动的强度和其积分长度尺度，除了固有的火焰不稳定性（主要是Darrieus-Landau不稳定性）火焰传播。首要目标是量化它们对火焰形态和燃烧速率的影响，并通过适当修改Damköhler的第一个假设来构建湍流火焰速度的标度律。火焰湍流相互作用推断从统计量的基础上发展的火焰拓扑结构，包括局部火焰曲率和流体动力学应变，其综合效果集成到火焰拉伸率所经历的火焰和局部火焰速度偏离层流火焰速度。
The propagation of outwardly expanding premixed flames in turbulent media is examined within the context of the hydrodynamic theory wherein the flame, treated as a surface of density discontinuity separating fresh combustible mixture from burned products, is propagating at a speed dependent upon local geometric and mixture/flow characteristics. An embedded manifold approach, one adept at handling multi-valued and disjointed surfaces which are frequently observed in real flames, is used to couple the flow and flame evolution. A sensitivity analysis, based on mixtures with different Markstein numbers, is performed to investigate early flame kernel development in addition to its long-term evolution. The focus is to understand the effect of turbulent flow characteristics, distinguished by the intensity of velocity fluctuations and its integral length scale, in addition to intrinsic flame instabilities (predominantly the Darrieus-Landau instability) on flame propagation. The overarching objective is to quantify their influence on the flame morphology and burning rate and to construct scaling laws for the turbulent flame speed through appropriate modifications of Damköhler’s first hypothesis. Flame-turbulence interactions are inferred from statistical quantities based on its developing flame topology, including local flame curvature and hydrodynamic strain, and their combined effects integrated into the flame stretch rate experienced by the flame and the local flame speed deviation from the laminar flame speed.
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影响因子：
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