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首页> 外文会议>AIAA aerospace sciences meeting including the new horizons forum and aerospace exposition >Large-scale strain rate effects on the premixed flame propagation in LES of a lean swirl-stabilized gas turbine combustor
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Large-scale strain rate effects on the premixed flame propagation in LES of a lean swirl-stabilized gas turbine combustor

机译：大型应变率对稀薄旋流稳定​​的燃气轮机燃烧室LES中预混火焰传播的影响

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摘要

Large-scale strain rate field, a resolved quantity which is easily computable in large-eddy simulations (LES), could have profound effects on the premixed flame properties by altering the turbulent flame speed and inducing local extinction. The role of the resolved strain rate has been investigated in a posterior LES study of a model gas turbine combustor - General Electric's lean premixed dry low NO_x LM6000. A novel multiscale combustion approach (LEM-CF) which is based on the coupling of the linear-eddy model (LEM) with the one-dimensional counter flow (CF) simulations has been applied to obtain the parameterizations of the resolved premixed flame properties in terms of the reactive progress variable, the local strain rate measure and local Reynolds and Karlovitz numbers. The strain rate effects have been studied by analyzing LES statistics for several models of the turbulent flame speed, i.e, with and without accounting for the local strain rate effects. The simulation results have been discussed and compared with available experimental data. Overall, the results suggest the strong necessity to represent the strain rate effects accurately in order to improve LES modeling of the turbulent flame speed.
机译：大型应变率场是一个可在大涡流模拟（LES）中轻松计算的分辨量，可通过改变湍流火焰速度并引起局部熄灭而对预混火焰特性产生深远影响。在模型燃气轮机燃烧器-通用电气公司的贫油预混合干式低NO_x LM6000的后LES研究中，已经研究了分辨应变率的作用。一种新颖的多尺度燃烧方法（LEM-CF）是基于线性涡模型（LEM）与一维逆流（CF）模拟的耦合而得到的，用于获得解析的预混火焰特性的参数化。反应进度变量，局部应变率测度以及局部雷诺数和卡洛维兹数的术语。通过分析湍流火焰速度的几种模型的LES统计量来研究应变率效应，即在考虑或不考虑局部应变率效应的情况下。已经讨论了仿真结果，并将其与可用的实验数据进行了比较。总体而言，结果表明，有必要准确地表示应变率效应，以改善湍流火焰速度的LES建模。

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