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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：大规模应变速率对瘦旋流稳定燃气轮机燃烧器的LES中预混火焰繁殖的影响

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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：大规模应变率磁场，通过改变湍流火焰速度和诱导局部灭绝，可以在大涡模拟（LES）中易于计算的分辨量，这可能对预混的火焰性能进行深远的影响。已经在模型燃气涡轮燃烧器的后部研究中研究了已解决的应变率的作用 - 通用电气的精益预混干燥低NO_X LM6000。基于线性涡流模型（LEM）与一维计数器（CF）模拟的新型多尺度燃烧方法（LEM-CF）已经应用于获得已解析的预混火焰属性的参数化反应进度变量的术语，局部应变速率测量和地方雷诺和卡尔沃茨数。通过分析湍流火焰速度的多种模型，即，不核算局部应变率效应，研究了应变速率效应。已经讨论了仿真结果，并与可用的实验数据进行了讨论。总体而言，结果表明，要准确地表示应变速率效应的巨大需要，以提高湍流火焰速度的LES建模。

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