Numerical methodology for spontaneous wrinkling of centrally ignited premixed flames – linear theory
Numerical methodology for spontaneous wrinkling of centrally ignited premixed flames – linear theory
复制标题
集中点燃预混火焰自发起皱的数值方法 - 线性理论
DOI：
10.1080/13647830.2021.1962981
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发表时间：
2021
影响因子：
1.3
通讯作者：
Matalon, Moshe
中科院分区：
文献类型：
--
作者：
Mohan, Shikhar;Matalon, Moshe
基于流体动力学理论，发展了一种改进的嵌入流形/Navier-Stokes数值方法，用于模拟预混火焰的传播。该方法在计算上是易于处理的，允许计算不仅被扩展到更大的物理域，但也跨越更广泛的物理化学参数的参数空间。本文的重点是检查的敏感性中心点燃，自由传播和向外扩展的圆形火焰小振幅扰动和观察火焰的发展，通过发病的流体动力学不稳定性。数值模拟，验证了线性稳定性分析，表明，与刘易斯数以上的临界混合物，热扩散效应施加稳定的影响，占主导地位，在小火焰半径，最初抑制所有的扰动增长。与线性理论一致，模拟显示火焰最初保持稳定，并证明存在一个特定的模式，这是第一个增长。据说这种模式决定了在不稳定性开始时实验观察到的细胞模式。临界火焰半径随Markstein长度和热膨胀系数的变化与这些分析结果定量一致。
An improved embedded-manifold/Navier–Stokes numerical methodology is developed to simulate the propagation of premixed flames within the context of the hydrodynamic theory. The method is computationally tractable, permitting calculations to not only be extended to larger physical domains but also to span a broader parametric space of physicochemical parameters. The focus of this paper is to examine the susceptibility of centrally ignited, freely propagating and outwardly expanding circular flames to small amplitude disturbances and observe the flame's development through the onset of the hydrodynamic instability. The numerical simulations, validated by a linear stability analysis, show that for mixtures with Lewis numbers above criticality, thermo-diffusive effects exert stabilising influences which dominate at small flame radii, initially suppressing the growth of all disturbances. Consistent with the linear theory, simulations show the flame initially remaining stable and demonstrate the existence of a particular mode which is the first to grow. This mode is said to dictate the cellular pattern observed experimentally at the onset of instability. The variation in critical flame radius with respect to the Markstein length and thermal expansion coefficients are in quantitative agreement with these analytical results.
向外传播的火焰中形成皱纹。
DOI：
--
发表时间：
1995
期刊：
Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics
影响因子：
--
作者：
Rahibe;Aubry;Sivashinsky;Lima
通讯作者：
Lima
拉伸预混火焰的消耗和位移速度 - 理论和模拟
影响因子：
4.4
作者：
G. Giannakopoulos;C. Frouzakis;Shikhar Mohan;A. Tomboulides;M. Matalon
通讯作者：
M. Matalon
DOI：
--
发表时间：
2008
期刊：
影响因子：
--
作者：
K. Pan;R. Fursenko
通讯作者：
R. Fursenko