Physical study of radiation effects on the boundary layer structure in a turbulent channel flow
Physical study of radiation effects on the boundary layer structure in a turbulent channel flow
复制标题
湍流通道流中边界层结构辐射效应的物理研究
DOI：
10.1016/j.ijheatmasstransfer.2013.02.041
复制
发表时间：
2013
影响因子：
5.2
通讯作者：
J. Taine
中科院分区：
文献类型：
--
作者：
Yufang Zhang;R. Vicquelin;O. Gicquel;J. Taine
在不同的温度、光学厚度（压力）和壁面发射率条件下，对槽道气流中的辐射和湍流对流进行了完整的数值耦合。在这个模型中，辐射处理的CK方法和蒙特卡罗传输方法，通过直接数值模拟的流动。湍流对辐射场的影响和辐射对湍流场的影响。气-气、气-壁辐射相互作用对温度场和通量场产生拮抗效应。第一种情况会增加壁面传导通量，而第二种情况会减少壁面传导通量，因此，温度场结构和壁面传导通量往往与无辐射时的结果有很大差异。经典的壁对数定律的温度，然后强烈修改的全球辐射效应。文中还讨论了应用中遇到的许多情况。所观察到的修改取决于所有的一组条件（温度水平，壁发射率，压力，雷诺数），即辐射气体-气体和气体-壁现象的相对幅度和全球辐射通量和无辐射的传导通量。
A complete numerical coupling between radiation and turbulent convection in a channel gas flow has been performed for different temperature, optical thickness (pressure) and wall emissivity conditions. In this model, radiation is treated from the CK approach and a Monte Carlo transfer method; the flow by a Direct Numerical Simulation. Both the effects of turbulence on radiation fields and of radiation on turbulent fields are accounted for. Gas–gas and gas–wall radiation interactions generate antagonist effects on the temperature and flux fields. The first one tends to increase wall conductive flux while the second one to decrease it. Consequently, the structure of the temperature field and the wall conductive flux often strongly differ from results without radiation. Classical wall log-laws for temperature are then strongly modified by the global radiation effects. Many conditions encountered in applications are discussed in the paper. The observed modifications depend on all the set of conditions (temperature level, wall emissivity, pressure, Reynolds number), i.e. on the relative magnitudes of radiation gas–gas and gas–wall phenomena and of global radiation flux and conductive flux without radiation.