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Large Eddy Simulation of a Bluff Body Stabilised Premixed Flame Using Flamelets

机译:利用小火焰对钝态稳定的预混火焰进行大涡模拟

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摘要

Large Eddy Simulations of an unconfined turbulent lean premixed flame, which is stabilised behind a bluff body, are conducted using unstrained flamelets as the sub-grid scale combustion closure. The statistics from the simulations are compared with the corresponding data obtained from the experiment and it is demonstrated that the experimental observations are well captured. The relative positioning of the shear layers and the flame brush are analysed to understand the radial variations of the turbulent kinetic energy at various streamwise locations. These results are also compared to confined bluff body stabilised flames, to shed light on the relative role of incoming and shear driven turbulence on the behaviour of the flame brush and the turbulent kinetic energy variation across it.
机译:使用无应变的小火焰作为子网格规模的燃烧封闭装置,对稳定在钝体后方的湍流稀薄的预混火焰进行了大涡模拟。将模拟的统计数据与从实验中获得的相应数据进行比较,证明了实验观察得到了很好的捕获。分析了剪切层和火焰刷的相对位置,以了解湍流动能在不同流向位置的径向变化。还将这些结果与受限的钝体稳定火焰进行了比较,以阐明传入和剪切驱动的湍流对火焰刷的行为以及其上的湍动能变化的相对作用。

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