Influence of Flow Configuration and Thermal Wall Boundary Conditions on Turbulence During Premixed Flame-Wall Interaction within Low Reynolds Number Boundary Layers
Influence of Flow Configuration and Thermal Wall Boundary Conditions on Turbulence During Premixed Flame-Wall Interaction within Low Reynolds Number Boundary Layers
复制标题
低雷诺数边界层内预混火焰壁相互作用过程中流动形态和热壁边界条件对湍流的影响
DOI：
10.1007/s10494-023-00437-y
复制
发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Ahmed U
中科院分区：
文献类型：
--
作者：
Ahmed U
研究了湍流边界层内流动形态对预混火焰火焰-壁面相互作用的影响。对完全发育的湍流边界层中火焰与化学惰性等温壁面和绝热壁面相互作用的两种不同流动形态进行了直接数值模拟。第一种构型是湍流通道中v型火焰的斜壁相互作用（OWI），第二种构型是湍流边界层中平面火焰的正面相互作用（HOI）。这些模拟是大气条件下甲烷-空气混合化学计量的代表，这些模拟的非反应湍流对应于基于摩擦速度的雷诺数。研究发现，平均壁面剪应力、平均壁面摩擦速度和平均壁面速度统计量在流动形态和热壁面边界条件下均有变化。在等温壁面条件下，两种流动形式的淬火距离和平均壁面热流密度有显著差异。在等温壁面情况下，壁面单元的无量纲温度变化表明，两种流动形式下壁面热流密度的变化显著改变了对数层区域的温度。平均雷诺应力和湍流耗散率的统计表明，由于热膨胀效应，火焰显著地改变了湍流的行为，而流动形态起着重要的作用。
The influence of flow configuration on flame-wall interaction (FWI) of premixed flames within turbulent boundary layers has been investigated. Direct numerical simulations (DNS) of two different flow configurations for flames interacting with chemically inert isothermal and adiabatic walls in fully developed turbulent boundary layers have been performed. The first configuration is an oblique wall interaction (OWI) of a V-flame in a turbulent channel flow and the second configuration is a head-on interaction (HOI) of a planar flame in a turbulent boundary layer. These simulations are representative of stoichiometric methane-air mixture under atmospheric conditions and the non-reacting turbulence for these simulations corresponds to the friction velocity based Reynolds number of. It is found that the mean wall shear stress, mean wall friction velocity and the mean velocity statistics are affected during FWI and the behaviour for these quantities varies under the different flow configurations as well as for the different thermal wall boundary conditions. The behaviour of the quenching distance and mean wall heat flux under isothermal wall conditions is found to be significantly different between the two flow configurations. The variation of the non-dimensional temperature in wall units for cases with isothermal walls suggests that the temperature in the log-layer region is significantly altered by the evolving wall heat flux in both flow configurations. Statistics of the mean Reynolds stresses and turbulence dissipation rate show that the flame significantly alters the behaviour of turbulence due to thermal expansion effects and flow configuration plays an important role.
登录
查看更多内容
湍流预混火焰正面淬火中标量耗散率传递的先验直接数值模拟
DOI：
--
发表时间：
2016
期刊：
影响因子：
--
作者：
J. Lai;N. Chakraborty
通讯作者：
N. Chakraborty
影响因子：
2.4
作者：
Lai, Jiawei;Klein, Markus;Chakraborty, Nilanjan
通讯作者：
Chakraborty, Nilanjan
湍流通道流中预混合和分层火焰传播的直接数值模拟
影响因子：
2.7
作者：
Gruber A
通讯作者：
Gruber A
基于火焰表面密度的湍流预混火焰正面淬火建模
DOI：
--
发表时间：
2017
期刊：
影响因子：
--
作者：
J. Sellmann;J. Lai;A. Kempf;N. Chakraborty
通讯作者：
N. Chakraborty
基于直接数值模拟数据库的火焰产生湍流建模
影响因子：
1.9
作者：
S. Nishiki;T. Hasegawa;R. Borghi;R. Himeno
通讯作者：
R. Himeno