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首页> 外文期刊>Advances in Mechanical Engineering >Analysis of macroscopic and microscopic rotating motions in rotating jets: A direct numerical simulation:
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Analysis of macroscopic and microscopic rotating motions in rotating jets: A direct numerical simulation:

机译：旋转射流中宏观和微观旋转运动的分析：直接数值模拟：

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摘要

A direct numerical simulation study of the characteristics of macroscopic and microscopic rotating motions in swirling jets confined in a rectangular flow domain is carried out. The different structures of vortex cores for different swirl levels are illustrated. It is found that the vortex cores of low swirl flows are of regular cylindrical-helix patterns, whereas those of the high swirl flows are characterized by the formation of the bubble-type vortex breakdown followed by the radiant processing vortex cores. The results of mean velocity fields show the general procedures of vortex origination. Moreover, the effects of macroscopic and microscopic rotating motions with respect to the mean and fluctuation fields of the swirling flows are evaluated. The microscopic rotating effects, especially the effects with respect to the turbulent fluctuation motion, are increasingly intermittent with the increase in the swirl levels. In contrast, the maximum value of the probability density functions with respect to t...
机译：进行了直接数值模拟研究，对受限于矩形流域的旋流中的宏观和微观旋转运动的特性进行了研究。示出了用于不同旋流水平的涡旋芯的不同结构。发现低涡流的涡流芯呈规则的圆柱螺旋形，而高涡流的涡流芯的特征在于形成气泡型涡流击穿，随后形成辐射加工涡流芯。平均速度场的结果显示了涡旋产生的一般过程。此外，评估了宏观和微观旋转运动对旋流的平均场和波动场的影响。微观旋转效应，尤其是关于湍流波动运动的效应，随着旋流水平的增加而越来越间歇。相反，概率密度的最大值相对于t ...

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