VALIDATION OF THE FPI CHEMISTRY REDUCTION METHOD FOR DILUTED NONADIABATIC PREMIXED FLAMES
VALIDATION OF THE FPI CHEMISTRY REDUCTION METHOD FOR DILUTED NONADIABATIC PREMIXED FLAMES
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FPI 化学还原方法对稀释非绝热预混火焰的验证
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
N. Darabiha
中科院分区：
文献类型：
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作者：
B. Fiorina;O. Gicquel;S. Carpentier;N. Darabiha
预测火焰形状、稳定过程和实际燃烧器中污染物的产生需要使用详细的化学过程。但是详细的方案引入了数十种物质，并且需要CPU时间来数值模拟燃烧器中的燃烧。本征低维流形的火焰延拓（FPI）方法是减少计算时间的化学动力学约化技术之一。FPI方法涉及减少描述反应混合物的化学演变的变量的数量。这是通过构造一个具有三个坐标的查找表来完成的-一个进度变量c、混合分数Z和焓h-并且通过仅求解这些变量的三个输运方程来完成。然后从查找表中提取所有其他物种。在本研究中，经过简短的描述的FPI方法，我们专注于其验证的情况下，预混稀释甲烷/空气火焰。首先，验证的情况下，提出了检查的能力的FPI方法来再现绝热假设下的复杂的化学燃烧的行为。本文研究了甲烷/空气混合气与新鲜空气逆流流动时的火焰结构。在此验证后，详细的化学和FPI计算的情况下，提出了一个二维的部分预混非绝热层流燃烧器之间的比较。这意味着使用具有三个变量（c，Z，h）的FPI查找表。结果表明，FPI模型可以再现预混稀释火焰的结构，这通常需要包括几十个化学物种的化学动力学。
Prediction of the flame shape, its stabilization process, and the production of pollutants in practical burners requires the use of detailed chemistry. But detailed schemes introduce tens of species and require CPU times for numerical simulation of combustion in the burner. One of the chemical kinetics reduction techniques which reduces the CPU time is the flame prolongation of Intrinsic Low Dimensional Manifold (ILDM) (FPI) method. The FPI method involves reducing the number of variables that describe the chemical evolution of the reactive mixture. This is done by the construction of a lookup table with three coordinates—a progress variable c, mixture fraction Z, and enthalpy h—and by solving only three transport equations for these variables. All other species are then extracted from the lookup table. In the present study, after a short description of the FPI method, we focus on its validation in the case of premixed diluted methane/air flames. First a validation case is presented to check the capability of the FPI method to reproduce the behavior of a complex chemistry combustion under adiabatic assumption. We study the flame structure in a counterflow flow of a premixed methane/air mixture against fresh air. After this validation, a comparison between detailed chemistry and FPI calculations is presented for the case of a two-dimensional partially premixed nonadiabatic laminar burner. This implies the use of an FPI lookup table with three variables (c, Z, h). It is shown that the FPI model can reproduce the structure of premixed diluted flames, which generally require chemical kinetics including tens of chemical species.