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首页> 外文期刊>Combustion Science and Technology >Optimized Reduced Chemistry and Molecular Transport for Large Eddy Simulation of Partially Premixed Combustion in a Gas Turbine
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Optimized Reduced Chemistry and Molecular Transport for Large Eddy Simulation of Partially Premixed Combustion in a Gas Turbine

机译：优化的还原化学和分子传输，用于燃气轮机中部分预混燃烧的大涡模拟

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摘要

A methodology is discussed to automatically determine the parameters of closed budget equations for chemical species mass fractions and energy, in order to simulate spatially filtered flames as required in large eddy simulation (LES). The method accounts for the effects of LES filtering on chemistry and transport by simultaneously optimizing, for a reduced number of species, the Arrhenius reaction rates and a correction to mixture-averaged molecular diffusion coefficients. The objective is to match, for a given filter size, spatially filtered canonical one-dimensional flames simulated with detailed chemistry solutions. This approach is designed for quite well-resolved LES, in which most of the unresolved fluctuations result from flame thickening due to spatial filtering, thus featuring weak levels of sub-grid scale flame wrinkling. Methane-air partially premixed combustion is addressed. A four-step reduced reaction mechanism involving seven species is developed along with mass and heat molecular transport properties. The optimization is performed at atmospheric pressure and at 3 bar, for ranges of fresh gas temperatures [300–650 K] and equivalence ratios [0.4–1.2]. Comparisons with the filtered detailed chemistry solution of a planar propagating front show that the laminar flame speed, the adiabatic flame temperature, the species profiles in the reaction zone, and the flow chemical composition and temperature at equilibrium are adequately predicted. The new sub-grid scale modeling approach is then applied to three-dimensional LES of an industrial gas turbine burner. Good agreement is found between the quantities predicted with LES and experimental data, in terms of flow and flame dynamics, axial velocities, averaged temperatures, and some major species concentrations. Results are also improved compared to previous simulations of the same burner.
机译：讨论了一种方法，该方法可以自动确定化学物质质量分数和能量的闭合预算方程的参数，以便根据大涡流仿真（LES）的要求模拟空间过滤的火焰。该方法通过同时针对减少的物种数优化Arrhenius反应速率并校正混合物平均分子扩散系数来解决LES过滤对化学和运输的影响。目的是在给定的过滤器尺寸下，使用详细的化学溶液对空间过滤的规范一维火焰进行匹配。这种方法是针对分辨率非常好的LES设计的，其中大多数未解决的波动是由于空间过滤导致的火焰增厚导致的，因此其特征在于次网格规模的火焰起皱程度较弱。解决了甲烷-空气部分预混燃烧的问题。建立了涉及七个物种的四步还原反应机理，以及质量和热分子传输性质。针对新鲜气体温度范围[300–650 K]和当量比[0.4–1.2]，在大气压和3 bar下进行优化。与平面传播前沿的过滤后详细化学溶液的比较表明，可以充分预测层流火焰速度，绝热火焰温度，反应区的物种分布以及流动化学成分和平衡温度。然后，将新的子网格规模建模方法应用于工业燃气轮机燃烧器的三维LES。在流动和火焰动力学，轴向速度，平均温度和一些主要物种浓度方面，用LES预测的数量与实验数据之间找到了很好的一致性。与之前相同燃烧器的仿真结果相比，结果也得到了改善。

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