大涡模拟研究展向旋转槽道湍流流动  

LARGE EDDY SIMULATION OF SPANWISE ROTATING TURBULENT CHANNEL FLOW

作　　者：刘宁[1] 

机构地区：[1]北京航空航天大学航空发动机气动热力国防科技重点实验室,北京100191

出　　处：《力学学报》2011年第1期24-31,共8页Chinese Journal of Theoretical and Applied Mechanics

摘　　要：大涡模拟预测了以不同转速做展向旋转的槽道湍流流动,统计平均的流向速度型在壁面附近与已有实验数据符合得很好.对比不同转速的计算结果,表明展向旋转通道的湍流应力和壁面摩擦力,在压力面附近提高、在吸力面附近降低,低阶湍流统计量的变化规律与对湍流应力输运方程的分析结果一致.旋涡识别技术显示了近壁条带结构,其形态和猝发率受旋转附加力的影响发生改变,进而影响壁面摩擦速度的数值和分布.进一步考察垂直流动方向的截面内速度分布,发现旋转引起了垂直壁面方向的流动,形成正负相间排列的流向涡对,并随着转速的增加向压力面靠近.用较少计算资源获得的上述结果与公开发表的结论一致.Large eddy simulation（LES） is used to predict flow filed in fully developed turbulent channel flow rotating along spanwise axis at six different angular velocities.Statistically-averaged streamwise velocity profile consists well with available experimental data near the wall.The phenomena that turbulence and wall friction are enhanced near pressure side and depressed near suction side are recovered.Explanation for the evolvement of lower order turbulence correlations is consistent with the analysis of the transport equation for each turbulence stress component.The bursting and the shape of near wall streak are also affected by rotational forces,resulting in variation of wall friction velocity.Furthermore,velocity distribution in streamwise cross section indicates that Coriolis force induces secondary flow normal to the wall.Such secondary flow generates counter rotating vortex pairs in streamwise,which shift towards pressure side as the rotating velocity increases.The results with low computational cost agree with available conclusion,implying possible application of LES for engineering usage.

关 键 词：大涡模拟 旋转 槽道湍流 湍流应力 湍流结构 

分 类 号：O357.5[理学—流体力学]