Laminar premixed hydrogen/air counterflow flame simulations using flame prolongation of ILDM with differential diffusion
Laminar premixed hydrogen/air counterflow flame simulations using flame prolongation of ILDM with differential diffusion
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DOI：
10.1016/s0082-0784(00)80594-9
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发表时间：
2000-01-01
影响因子：
3.4
通讯作者：
Thévenin, D
中科院分区：
文献类型：
--
作者：
Gicquel, O;Darabiha, N;Thévenin, D
在实际计算中包含完整动力学的成本仍然非常高。这促使许多研究人员开发化学还原技术。这些方法通常仅在非常有限的当量比、压力或温度范围内有效，并且需要大量的人力时间来开发简化方案。最近，提出了一种基于内在低维流形（ILDM）的自动方法。由于 ILDM，详细反应方案的简化大大简化，从而可以快速生成包含与简化的化学方案相对应的信息的查找表。然而，ILDM 方法不太适合描述低温域，因为该区域数据库的维度和复杂性极大增加。在这项工作中，我们提出了一种新版本的 ILDM 方法，称为 ILDM 火焰延长（FPI），它使我们能够在低温下解决问题。我们使用层流预混合自由火焰来扩展 ILDM 生成的歧管，从而使物种沿着所有火焰锋面平稳而准确地演化。为了证明 FPI 的重要性，我们使用双预混逆流火焰配置计算了预混火焰对应变的响应。我们证明，使用 FPI，所有物种都能获得正确的进化，从几乎不受约束的火焰到濒临灭绝的火焰。与完整化学相比，FPI 的计算时间大大减少。
The cost of including full kinetics in realistic computations remains extremely high. This has led many researchers to develop reduction techniques for the chemistry. These methods are generally valid only in a very limited range of equivalence ratio, pressure, or temperature and require extensive human time to develop the reduced schemes. Recently, an automatic method based on intrinsic low-dimensional manifolds (ILDM) has been proposed. Because of ILDM, the reduction of detailed reaction schemes is much simplified, leading to the fast generation of look-up tables containing the information corresponding to the reduced chemical schemes. Nevertheless, the ILDM method is not well suited to describe the low-temperature domain, since the dimension and therefore the complexity of the databases increase tremendously in this zone. In this work, we propose a new version of the ILDM method, called flame prolongation of ILDM (FPI), which enables us to solve the problem at low temperatures. We used laminar premixed free flames to extend the manifolds generated with ILDM, thus leading to smooth and accurate evolutions of the species along all the flame front. In order to demonstrate the interest of FPI, we computed the response of a premixed flame to straining using the double-premixed counterflow flame configuration. We show that using FPI, the correct evolution is obtained for all species from almost unstrained flames up to flames near extinction. The computational times are tremendously reduced with FPI in comparison with full chemistry.