Simulation of Spherically Expanding Turbulent Premixed Flames

Simulation of Spherically Expanding Turbulent Premixed Flames
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球形膨胀湍流预混火焰的模拟

DOI:
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发表时间:
2013
期刊:
影响因子:
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通讯作者:
N. Swaminathan
N. Swaminathan
中科院分区:
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文献类型:
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作者:
I. Ahmed;N. Swaminathan

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采用非定常雷诺平均Navier-Stokes(URANS)方法计算了统计球形膨胀湍流预混火焰。平均反应速率使用应变和非应变火焰面模型和代数模型来闭合。用应变火焰片模型中的标量耗散率对火焰片进行了参数化。结果表明,该模型能够很好地模拟甲烷-空气湍流火焰球的生长速度,且不存在热扩散不稳定性。观察到球形火焰不断加速。火焰刷子厚度随时间增长,与化学反应引起的流体速度引起的对流相比,湍流扩散对火焰刷子厚度增长的作用似乎次要。与平面火焰相比,在一定的湍流和热化学条件下,球形火焰具有更大的湍流火焰速度和前缘位移速度st。计算结果表明,对于球形火焰和平面火焰,雷诺数为0.57≤n≤为0.58,其中Re t为湍流雷诺数,为无应变平面层流火焰速度。
Statistically spherical expanding turbulent premixed flames are computed using an unsteady Reynolds-averaged Navier–Stokes (URANS) approach. Mean reaction rate is closed using strained and unstrained flamelet models and an algebraic model. The flamelets are parametrized using the scalar dissipation rate in the strained flamelet model. It is shown that this model is able to capture the measured growth rate of methane–air turbulent flame ball, which is free of thermo–diffusive instability. The spherical flames are observed to accelerate continuously. The flame brush thickness grows in time and the role of turbulent diffusion on this growth seems secondary compared to the convection due to the fluid velocity induced by the chemical reaction. The spherical flames have larger turbulent flame speed, the leading-edge displacement speed st, compared to the planar flames for a given turbulence and thermochemical condition. The computational results suggest with 0.57 ≤ n ≤ 0.58, where Re t is the turbulence Reynolds number and is the unstrained planar laminar flame speed, for both spherical and planar flames.
勘误表:使用直接数值模拟测量静态预混 V 型火焰的几何特性和湍流火焰速度
DOI: 10.1007/s10494-010-9304-1
发表时间: 2010
期刊: Flow, Turbulence and Combustion
影响因子: --
作者:
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DOI: 10.1007/s10494-010-9284-1
发表时间: 2011-12
期刊: Flow, Turbulence and Combustion
影响因子: --
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通讯作者: T. Dunstan;N. Swaminathan;K. Bray;R. Cant
DOI: 10.1007/s10494-010-9250-y
发表时间: 2010-02
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火焰几何形状对湍流预混火焰传播的影响:DNS 研究
DOI: 10.1017/jfm.2012.328
发表时间: 2012
影响因子: 3.7
作者:
Dunstan T
通讯作者: Dunstan T